# ChronoMind — Product Roadmap

> **Product:** ChronoMind — AI-Powered Time Awareness Layer
> **Product ID:** `chronomind` (ByteLyst ecosystem)
> **Strategy:** Option D — Web PWA (MVP) → SwiftUI (iOS/Watch/Mac) → Android (v2)
> **Version:** 2.0 (revised per [roadmap-v2-review.md](roadmap-v2-review.md) audit)
> **Created:** February 2026
> **License:** Closed-source app; timer engine library open-source (TBD license)
> **See also:** [PRD.md](PRD.md) | [INDUSTRY_RESEARCH.md](INDUSTRY_RESEARCH.md) | [roadmap-v2-review.md](roadmap-v2-review.md)
>
> **Backend:** Platform-service in `learning_ai_common_plat` (Fastify, port 4003) — reuses 17+ existing modules (auth, subscriptions, stripe, invitations, referrals, settings, flags, telemetry, waitlist, ratelimit, usage, plans, licenses, etc.). Only 4 new modules needed: `timers`, `routines`, `shared-timers`, `households`.

---

## Executive Summary

ChronoMind ships in **5 phases over ~6 months**, from web MVP to full cross-platform product:

| Phase | Timeline | Platform | Goal |
|-------|----------|----------|------|
| **Phase 1** | Week 1-2 | Web PWA | Ship MVP — validate core concept |
| **Phase 2** | Week 3-5 | Web PWA | Intelligence layer — make it smart |
| **Phase 3** | Week 6-9 | iOS + Apple Watch + macOS | Go native — own the wrist |
| **Phase 4** | Week 10-14 | All Apple + Web | Context, sync, growth — make it sticky |
| **Phase 5** | Week 15-22 | + Android + Wear OS | Full platform — scale to everyone |

**North star metric:** Daily Active Users who set a timer with pre-warnings enabled.

---

## Architecture Overview

```
┌──────────────────────────────────────────────────────────────────────────┐
│                        ChronoMind Architecture                          │
├──────────────────────────────────────────────────────────────────────────┤
│                                                                          │
│  Track 1: Web (Next.js 16)              Track 2: Apple (SwiftUI)        │
│  ─────────────────────────              ────────────────────────         │
│  src/lib/timer-engine.ts   ──port──→    Shared/TimerEngine/*.swift      │
│  src/lib/cascade.ts        ──port──→    Shared/TimerEngine/Cascade.swift│
│  src/lib/recurrence.ts     ──port──→    Shared/TimerEngine/Recurrence.  │
│  src/lib/store.ts (Zustand+IDB)        Shared/Store/ (SwiftData)       │
│  src/components/ (React)                ChronoMind/ (iOS SwiftUI)       │
│                                         ChronoMindWatch/ (watchOS)      │
│                                         ChronoMindMac/ (macOS menu bar) │
│                                                                          │
│  Track 3: Android (v2)                                                   │
│  ──────────────────────                                                  │
│  TimerEngine/*.kt (Kotlin port)                                         │
│  UI: Jetpack Compose                                                     │
│  Watch: Wear OS + Glance widgets                                        │
│                                                                          │
│  Shared: Platform-service (Fastify, port 4003) — Cosmos DB sync         │
│  Analytics: Platform-service telemetry / Plausible (privacy-first)      │
└──────────────────────────────────────────────────────────────────────────┘
```

---

## Phase 1: Web MVP — "Make It Work" (Week 1-2)

> **Goal:** Ship a functional PWA that validates the core concept — pre-warning cascades make timers actually useful.
> **Success criteria:** 10 people use it daily for a week and say "I can't go back to a normal timer."

### Week 1: Foundation + Timer Engine

- [ ] **Pre-work (before coding)**
  - [ ] Register domain: `chronomind.app` or `chronomind.io` (needed for deployment + Universal Links)
  - [ ] Set up DNS for Vercel deployment
  - [ ] Low-fi wireframes: timeline, create timer, Pomodoro, alarm overlay (1 day)
  - [ ] Define urgency level color mapping from `@bytelyst/design-tokens` + ChronoMind product section

- [x] **Project scaffold** ([6ac54d7](https://github.com/saravanakumardb1/learning_ai_clock/commit/6ac54d7))
  - [x] `npx create-next-app@latest` with Next.js 16, App Router, TypeScript
  - [x] TailwindCSS v4 setup + Lucide React icons
  - [x] Zustand store with localStorage persistence ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] ESLint + Vitest config
  - [x] Basic folder structure: `app/`, `components/`, `lib/`
  - [x] GitHub Actions CI: lint + typecheck + vitest on PR ([02f9a5f](https://github.com/saravanakumardb1/learning_ai_clock/commit/02f9a5f))
  - [ ] Auto-deploy to Vercel on `main` push
  - [ ] Analytics: platform-service telemetry module (or Plausible as lightweight fallback)
  - [ ] Track: page views, timer created, timer completed, cascade fired, Pomodoro completed, PWA installed

- [x] **Timer engine (`lib/timer-engine.ts`)** ([6ac54d7](https://github.com/saravanakumardb1/learning_ai_clock/commit/6ac54d7))
  - [x] `Timer` interface with all fields (id, type, label, urgency, targetTime, duration, cascade, etc.)
  - [x] Create timer (alarm, countdown, pomodoro)
  - [x] Start / pause / resume / cancel countdown
  - [x] Timer state machine: `idle → active → warning → firing → snoozed → dismissed`
  - [x] `requestAnimationFrame` for UI countdown display (smooth 60fps in active tab)
  - [ ] `setInterval` in Service Worker for background notification scheduling (30s check)
  - [x] Both contexts needed: rAF stops when tab hidden, SW runs in background
  - [x] Unit tests for timer state transitions (23 tests)

- [x] **Pre-warning cascade (`lib/cascade.ts`)** ([6ac54d7](https://github.com/saravanakumardb1/learning_ai_clock/commit/6ac54d7))
  - [x] Cascade presets (aligned with PRD): Aggressive, Standard, Light, Minimal, None, Custom
  - [x] Custom cascade builder (user picks intervals)
  - [x] Cascade scheduler: calculate all warning timestamps from target time
  - [x] Cascade state tracking: which warnings have fired
  - [x] Unit tests for cascade calculation edge cases (17 tests)

- [x] **Urgency system (`lib/urgency.ts`)** ([6ac54d7](https://github.com/saravanakumardb1/learning_ai_clock/commit/6ac54d7))
  - [x] 5 levels: Critical, Important, Standard, Gentle, Passive
  - [x] Each level maps to: notification style, sound, vibration, visual intensity, snooze behavior
  - [x] Critical: persistent sound, full-screen overlay, no auto-dismiss
  - [x] Passive: badge only, no sound

- [x] **Dashboard with timer list (`components/Dashboard.tsx`)** ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] Timer list showing all active/upcoming timers sorted by fire time
  - [x] Color-coded by urgency level
  - [x] Current time display in header with smooth animation
  - [x] Pre-warning cascade progress bar on each timer card
  - [x] Timer cards with full details (countdown, urgency, state, actions)
  - [x] Empty state: "No active timers — Create your first timer"

- [x] **Create timer flow (`components/CreateTimerModal.tsx`)** ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] Quick timer: one-tap presets (5m, 15m, 25m, 45m, 1h) via `QuickTimerBar` ([6b46384](https://github.com/saravanakumardb1/learning_ai_clock/commit/6b46384))
  - [x] Alarm: time picker, label, urgency selector, cascade preset
  - [x] Countdown: duration picker (hours, minutes, seconds), label, urgency
  - [ ] Form validation with Zod
  - [x] Save to Zustand store → localStorage

- [x] **Clock display in header** ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] Current time with AM/PM in header
  - [x] Date display in header
  - [x] Next timer countdown shown in tab title
  - [x] Responsive: compact in app header

### Week 2: Notifications + Polish

- [x] **Notifications (`lib/notifications.ts`)** ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] Request notification permission on first timer creation
  - [ ] Service Worker registration via Serwist (`@serwist/next`)
  - [x] Schedule pre-warning notifications at cascade timestamps
  - [x] Different notification styles per urgency (title, body, icon, sound tag)
  - [x] Notification click → open app to timer detail
  - [ ] Fallback: in-app toast if notifications denied

- [ ] **Sound system (`lib/sounds.ts`)**
  - [ ] Web Audio API setup with AudioContext
  - [ ] 5 built-in alarm sounds (gentle chime, standard beep, urgent siren, critical alarm, soft bell)
  - [ ] Volume mapping per urgency level
  - [ ] Sound preview in settings
  - [ ] Graceful fallback if audio blocked by browser

- [x] **Tab title countdown** (integrated in `Dashboard.tsx`) ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] Show "MM:SS — Label | ChronoMind" in browser tab title
  - [x] Update every tick for active timer
  - [ ] Flash title when timer fires
  - [x] Restore original title when no active timers

- [x] **Alarm overlay (`components/AlarmOverlay.tsx`)** ([da4f3b5](https://github.com/saravanakumardb1/learning_ai_clock/commit/da4f3b5))
  - [x] Full-screen overlay for CRITICAL urgency
  - [x] Pulsing animation
  - [x] Large "Dismiss" button (with confirmation for Critical)
  - [x] "Snooze 5m / 15m" buttons
  - [x] Cannot be accidentally dismissed (Critical requires "Confirm Dismiss")

- [x] **Pomodoro timer (`components/PomodoroView.tsx`)** ([6b46384](https://github.com/saravanakumardb1/learning_ai_clock/commit/6b46384))
  - [x] Work/break cycle configuration (default: 25m work, 5m break, 4 rounds, 15m long break)
  - [x] Visual progress ring showing time remaining (`CountdownRing.tsx`)
  - [x] Round counter (e.g., "Round 2 of 4") with dot indicators
  - [x] Auto-transition between work and break
  - [ ] Session complete celebration

- [x] **Dark + light theme** ([2a4d66f](https://github.com/saravanakumardb1/learning_ai_clock/commit/2a4d66f))
  - [ ] System preference detection (`prefers-color-scheme`)
  - [x] Manual toggle in header (Sun/Moon icon)
  - [x] Theme persisted to localStorage
  - [x] All components themed via CSS custom properties (`--cm-*`)

- [x] **PWA setup** (partial) ([ace036b](https://github.com/saravanakumardb1/learning_ai_clock/commit/ace036b))
  - [ ] Serwist service worker configuration
  - [x] Web app manifest (name, icons, theme color, display: standalone)
  - [ ] Offline support: app shell cached, timers work offline
  - [ ] Install prompt UI ("Add to home screen" banner)
  - [x] PWA metadata in layout (apple-web-app-capable, theme-color)

- [x] **Keyboard shortcuts** ([6b46384](https://github.com/saravanakumardb1/learning_ai_clock/commit/6b46384))
  - [x] `N` — new timer
  - [x] `Q` — quick timer modal
  - [x] `Space` — start/pause active timer
  - [x] `Esc` — dismiss alarm / close modal
  - [x] `?` — show shortcuts overlay

- [x] **Landing page (`app/landing/page.tsx`)** ([ace036b](https://github.com/saravanakumardb1/learning_ai_clock/commit/ace036b))
  - [x] Hero: tagline "Never be caught off-guard again"
  - [x] 6 key features with icons (Pre-warnings, Timeline, Urgency, Pomodoro, Smart Defaults, Privacy)
  - [x] "Try it now" button → app dashboard (no signup needed)
  - [x] Social proof section (placeholder for neurodivergent community)
  - [x] Footer: links, GitHub, privacy
  - [x] Privacy policy page (`/privacy`)
  - [x] Terms of service page (`/terms`)

- [ ] **First-run onboarding**
  - [ ] 3-step walkthrough: create timer → set cascade → see timeline
  - [ ] "Create your first timer" prompt on empty dashboard
  - [ ] Tooltip hints on cascade and urgency pickers

- [ ] **Feedback mechanism**
  - [ ] Feedback button in app (opens email or form)
  - [ ] Bug report button with auto-attached browser info

- [ ] **Web accessibility (WCAG 2.1 AA)**
  - [ ] Keyboard navigation works for all flows
  - [ ] Screen reader tested (NVDA/VoiceOver) on timeline and timer creation
  - [ ] Focus indicators on all interactive elements
  - [ ] Sufficient color contrast for all urgency levels

- [ ] **Timer accuracy tests**
  - [ ] Timing accuracy: create timer for T+5s, verify fires within 100ms tolerance
  - [ ] Service Worker notification timing tests
  - [ ] Stress test: 50 concurrent timers with cascades → all fire correctly

- [ ] **Offline resilience strategy**
  - [ ] Document SW lifecycle: timers survive SW termination via IndexedDB timestamps + SW `periodicsync`
  - [ ] Background sync queue for analytics events
  - [ ] IndexedDB size limit handling (warn user, purge old history)
  - [ ] "Tab must be open for notifications" disclaimer for iOS Safari

### Phase 1 Exit Criteria

- [ ] PWA installs and works offline on Chrome, Safari, Firefox
- [ ] Timer fires with cascade pre-warnings at correct times
- [ ] Notifications work on desktop Chrome, Android Chrome
- [ ] iOS Safari: tab title countdown works (notification best-effort)
- [ ] Pomodoro completes full 4-round session correctly
- [ ] Lighthouse PWA score > 90
- [ ] Page load < 2 seconds
- [ ] All Vitest unit tests pass
- [ ] Deployed to Vercel with custom domain
- [ ] CI/CD pipeline running (GitHub Actions + Vercel auto-deploy)
- [ ] Analytics tracking timer creation and cascade engagement
- [ ] WCAG 2.1 AA: keyboard nav + screen reader tested
- [ ] Privacy policy published at `/privacy`
- [ ] 5 beta testers using it daily (measured via analytics)

---

## Phase 2: Intelligence — "Make It Smart" (Week 3-5)

> **Goal:** Add the features that make ChronoMind irreplaceable — routines, NL input, focus mode, gamification.
> **Success criteria:** Users create routines and say "This replaced 3 apps for me."

### Week 3: Routines + Linked Timers

- [ ] **Routine engine (`lib/routines.ts`)**
  - [ ] Routine data model: ordered array of steps (label, duration, transition type)
  - [ ] Transition types: immediate, 1m break, 5m break, custom
  - [ ] Routine state machine: `ready → step_1_active → step_1_transition → step_2_active → ... → complete`
  - [ ] Auto-advance between steps with transition notification
  - [ ] Pause/resume entire routine (pauses current step timer)
  - [ ] Skip step button
  - [ ] Unit tests for multi-step routines with transitions

- [ ] **Routine editor (`components/RoutineEditor.tsx`)**
  - [ ] Add/remove/reorder steps (drag-and-drop)
  - [ ] Per-step: label, duration, urgency, notes
  - [ ] Routine templates: Morning (5 steps), Evening Wind-down (4 steps), Cooking Prep (3 steps)
  - [ ] Save routine as template for reuse
  - [ ] Total duration display (auto-calculated)
  - [ ] Preview timeline of routine

- [ ] **Routine runner (`components/RoutineRunner.tsx`)**
  - [ ] Full-screen routine execution view
  - [ ] Current step highlighted with countdown ring
  - [ ] Next step preview
  - [ ] Progress bar showing overall routine progress
  - [ ] Step transition animation (gentle slide)
  - [ ] "Done early" button to advance

- [ ] **Linked timers (`lib/linked-timers.ts`)**
  - [ ] "When timer A ends, start timer B" relationship
  - [ ] Chain visualization in timeline
  - [ ] Linked timer presets: Pasta (boil water → add pasta → start sauce)
  - [ ] Cancel chain option (cancel one, option to cancel all linked)
  - [ ] Unit tests for chain execution

- [ ] **Natural language input (`components/NLInput.tsx` + `lib/nl-parser.ts`)**
  - [ ] Integration with `chrono-node` for date/time parsing
  - [ ] Examples: "Standup in 30 minutes", "Wake up at 6:30am tomorrow", "Remind me at 3pm to call Mom"
  - [ ] Extract: time, duration, label, urgency hints ("important meeting" → Important)
  - [ ] Sticky input bar at top of dashboard
  - [ ] Parse preview: show parsed timer before confirming
  - [ ] Fallback: if parse fails, open manual create form with whatever was understood
  - [ ] Unit tests for 20+ natural language patterns

### Week 4: Focus Mode + Stats

- [ ] **Focus mode (`app/(app)/focus/`)**
  - [ ] Activate focus: choose duration or "until next timer"
  - [ ] Block all notifications except CRITICAL urgency
  - [ ] Full-screen focus view with minimal distraction
  - [ ] Ambient background sound options (rain, white noise, coffee shop) — Web Audio API
  - [ ] Integration with Pomodoro (focus mode auto-activates during work intervals)
  - [ ] Focus session summary on completion (time focused, distractions blocked)

- [ ] **Contextual pre-warning messages (`lib/context-messages.ts`)**
  - [ ] Based on timer label, generate helpful prep messages
  - [ ] Rules engine: "meeting" → "Review your agenda", "flight" → "Check in online", "dentist" → "Leave in X minutes"
  - [ ] Keyword → message mapping (expandable, no LLM needed)
  - [ ] Custom messages per timer (user override)
  - [ ] Show in notification body and on timeline

- [ ] **Statistics + streaks (`app/(app)/history/`)**
  - [ ] Timers created / completed / snoozed / dismissed — daily, weekly, monthly
  - [ ] On-time rate: % of timers acted on within 2 minutes of firing
  - [ ] Focus time: total hours in focus/Pomodoro mode
  - [ ] Current streak: consecutive days with at least 1 completed timer
  - [ ] Streak freeze: miss a day but keep streak (1 free freeze per week)
  - [ ] Weekly summary card (shareable — great for social/viral)
  - [ ] Charts: Recharts (line chart for trends, bar for daily breakdown)

- [ ] **Categories / tags**
  - [ ] Built-in categories: Work, Personal, Health, Cooking, Exercise, Study
  - [ ] Custom tags
  - [ ] Filter timeline by category
  - [ ] Category-specific default urgency and cascade presets
  - [ ] Color-coded category indicators on timeline

- [ ] **Recurring timers (`lib/recurrence.ts`)**
  - [ ] Recurrence rules: daily, weekday, weekend, weekly, biweekly, monthly, custom (select days)
  - [ ] Next occurrence calculation
  - [ ] "Skip next" and "Pause recurring" options
  - [ ] Recurring timer badge on timeline
  - [ ] Bulk edit: change all future occurrences
  - [ ] Unit tests for recurrence edge cases (month boundaries, DST, etc.)

### Week 5: Calendar + Neurodivergent Mode + Polish

- [ ] **Calendar .ics import (`lib/calendar-import.ts`)**
  - [ ] Parse `.ics` file (iCalendar format)
  - [ ] Import events as alarms with auto-generated cascade
  - [ ] Subscribe to calendar URL (re-fetch periodically)
  - [ ] Import preview: show events before confirming
  - [ ] Conflict detection: warn if imported event overlaps existing timer
  - [ ] Map calendar event priority to urgency level

- [ ] **Neurodivergent-friendly design (DEFAULT UX, not a toggle)**
  - [ ] Visual countdown ring (`components/CountdownRing.tsx`)
    - [ ] Large, animated circular countdown (inspired by Time Timer)
    - [ ] Color transitions: green → yellow → orange → red as time decreases
    - [ ] Optional: fill vs drain animation style
  - [ ] Gentle transition alerts (soft chime + visual pulse, not jarring alarm)
  - [ ] Reduced cognitive load: hide advanced options by default, progressive disclosure
  - [ ] Time blindness aids: "This is about as long as [familiar reference]" (e.g., "25 min — one TV episode")
  - [ ] Body doubling placeholder: "Focus with others" room (v3 feature, show coming soon)
  - [ ] Toggle in settings: "Compact mode" for power users who want dense UI (the DEFAULT is already neurodivergent-friendly per PRD decision #7)

- [ ] **Prep time intelligence**
  - [ ] Per-timer: "I need X minutes to prepare"
  - [ ] Auto-generates a prep warning: "Start preparing now — your meeting is in 20 minutes"
  - [ ] Prep time shown on timeline as a colored block before the timer
  - [ ] Smart defaults based on category (meeting → 10m, flight → 2h, cooking → 15m)

- [ ] **Adaptive snooze learning (`lib/adaptive-snooze.ts`)**
  - [ ] Track snooze patterns per timer/category
  - [ ] After 5+ data points: "You always snooze your morning alarm 3 times. Set it 15 minutes later?"
  - [ ] Suggestion shown as dismissable card on dashboard
  - [ ] Accept → auto-adjusts recurring timer

- [ ] **Event countdown timer**
  - [ ] Days/hours until a future date with milestone warnings (30 days, 7 days, 1 day, etc.)
  - [ ] Timer type `event` in data model (matching PRD feature #26)
  - [ ] Visual: large countdown display with milestone progress bar
  - [ ] Use cases: "132 days until wedding", "47 days until vacation"

- [ ] **Timer export / import (local backup)**
  - [ ] "Export timers" → JSON download of all timers, routines, stats
  - [ ] "Import timers" → upload JSON to restore
  - [ ] Warning: "Your timers are stored locally. Export regularly or enable cloud sync (coming in v1.1)."

- [ ] **iOS waitlist**
  - [ ] Waitlist signup on web landing page ("Get notified when iOS launches")
  - [ ] Use platform-service `waitlist` module (already exists) when backend is connected
  - [ ] Fallback: simple email collection form

- [ ] **Timer history (`app/(app)/history/`)**
  - [ ] Searchable log of all past timers
  - [ ] Filter by category, urgency, date range
  - [ ] "Repeat" button to recreate a past timer
  - [ ] Export as CSV

- [ ] **Playwright E2E tests**
  - [ ] Create alarm → verify it appears on timeline
  - [ ] Create countdown → verify it counts down → fires notification
  - [ ] Create routine → run through all steps
  - [ ] Pomodoro → complete 4 rounds
  - [ ] NL input → verify parsing
  - [ ] PWA install flow

### Phase 2 Exit Criteria

- [ ] Routines work end-to-end (create, run, complete, save as template)
- [ ] NL input successfully parses 80%+ of natural time expressions
- [ ] Focus mode blocks notifications during session
- [ ] Streak tracking persists across sessions
- [ ] Calendar .ics import works with Google Calendar exports
- [ ] Neurodivergent mode is default and noticeably gentler than previous
- [ ] All E2E tests pass in CI
- [ ] 25+ beta testers, 3+ using routines daily
- [ ] ProductHunt submission prepared (web) — App Store prep moved to Phase 3

---

## Phase 3: Apple Native — "Own the Wrist" (Week 6-9)

> **Goal:** Ship native iOS + Apple Watch apps. macOS deferred to Phase 4 (4 weeks for iOS + Watch + Live Activities is already aggressive).
> **Success criteria:** Apple Watch complications are the #1 reason users love ChronoMind.
> **Framework decision:** Fully native SwiftUI (NOT KMP) — see [platform analysis in PRD](PRD.md).
> **Note:** This phase is 4 weeks, not 3 as PRD states. PRD phases section should be updated to match.

### Week 6: iOS App Foundation

- [ ] **Xcode project setup**
  - [ ] Multi-target Xcode project: ChronoMind (iOS), ChronoMindWatch (watchOS), ChronoMindMac (macOS)
  - [ ] Shared Swift package: `Shared/` folder included in all targets
  - [ ] SwiftData for persistence (or Core Data if SwiftData has issues)
  - [ ] Dependency: none beyond Apple frameworks (zero third-party for v1)
  - [ ] Minimum deployment: iOS 17, watchOS 10, macOS 14

- [ ] **Timer engine Swift port (`Shared/TimerEngine/`)**
  - [ ] `Cascade.swift` — port from `cascade.ts`
  - [ ] `Urgency.swift` — port from `urgency.ts`
  - [ ] `Recurrence.swift` — port from `recurrence.ts`
  - [ ] `Scheduler.swift` — port from `timer-engine.ts`
  - [ ] `NLParser.swift` — port from `nl-parser.ts` (use NSDataDetector + custom patterns)
  - [ ] `ContextMessages.swift` — port from `context-messages.ts`
  - [ ] XCTest unit tests mirroring all Vitest tests from web
  - [ ] **Estimated effort: 2-3 days** (~500-800 lines, logic is pure computation)

- [ ] **Data models (`Shared/Models/`)**
  - [ ] `CMTimer` — SwiftData model matching web Timer interface
  - [ ] `CMRoutine` + `CMRoutineStep`
  - [ ] `CMCategory`
  - [ ] `CMTimerHistory`
  - [ ] `CMUserPreferences`
  - [ ] All models tagged with `@Model` for SwiftData

- [ ] **iOS screens**
  - [ ] `TimelineView` — vertical timeline (main screen, tab 1)
  - [ ] `CreateTimerView` — alarm, countdown, pomodoro creation
  - [ ] `QuickTimerSheet` — bottom sheet with one-tap presets
  - [ ] `RoutineListView` + `RoutineRunnerView`
  - [ ] `FocusView` — focus/Pomodoro session
  - [ ] `HistoryView` — past timers, stats, streaks
  - [ ] `SettingsView` — preferences, categories, sounds, neurodivergent mode
  - [ ] Tab navigation: Timeline | Focus | History | Settings

- [ ] **Notification scheduling (`Shared/Notifications/`)**
  - [ ] `UNUserNotificationCenter` for all pre-warnings
  - [ ] Schedule cascade notifications when timer is created
  - [ ] Critical alerts: request `.criticalAlert` authorization for CRITICAL urgency
  - [ ] Time Sensitive notifications for Important urgency
  - [ ] Custom notification sounds per urgency
  - [ ] Notification actions: Snooze 5m, Snooze 15m, Dismiss
  - [ ] Reschedule all notifications when timer is modified

- [ ] **Haptic engine**
  - [ ] `UIImpactFeedbackGenerator` for pre-warning taps
  - [ ] Escalating haptic pattern matching urgency (gentle → standard → heavy)
  - [ ] Continuous haptic for Critical alarm (repeating pattern until dismissed)

### Week 7: Apple Watch + Widgets

- [ ] **Apple Watch app (`ChronoMindWatch/`)**
  - [ ] `WatchTimelineView` — compact timeline for wrist
  - [ ] `WatchTimerDetailView` — current timer with countdown ring
  - [ ] `WatchQuickTimerView` — one-tap presets on Watch
  - [ ] Digital Crown: scroll through upcoming timers
  - [ ] Haptic pre-warnings on wrist (gentle tap for early warnings, prominent for final)
  - [ ] Dismiss/snooze directly from Watch

- [ ] **Watch complications**
  - [ ] `WidgetKit` complications for Watch faces
  - [ ] Circular: countdown to next timer
  - [ ] Rectangular: next timer label + time remaining
  - [ ] Inline: "Standup in 14m"
  - [ ] Corner: countdown ring
  - [ ] Update complications via `WidgetCenter.shared.reloadAllTimelines()`

- [ ] **Live Activities + Dynamic Island**
  - [ ] `ActivityKit` Live Activity for active countdown/Pomodoro
  - [ ] Dynamic Island compact: timer name + countdown
  - [ ] Dynamic Island expanded: countdown ring + snooze/dismiss buttons
  - [ ] Lock Screen Live Activity: full countdown with cascade progress
  - [ ] Auto-start Live Activity when timer enters final 30 minutes
  - [ ] End Live Activity when timer is dismissed

- [ ] **iOS widgets (`WidgetKit`)**
  - [ ] Small widget: next timer countdown
  - [ ] Medium widget: next 3 timers list
  - [ ] Large widget: mini timeline
  - [ ] Lock Screen widget: next timer inline
  - [ ] Widget tap → deep link to timer in app
  - [ ] Timeline provider: update every 5 minutes + on timer change

- [ ] **Siri Shortcuts**
  - [ ] "Set a timer for 25 minutes" → creates countdown
  - [ ] "Start my morning routine" → starts saved routine
  - [ ] "What's my next timer?" → speaks next timer info
  - [ ] App Intents framework for iOS 17+
  - [ ] Shortcuts app integration

### Week 8: AI Reschedule + Gamification

> **Note:** macOS menu bar app deferred to Phase 4 (Week 10-11). Phase 3 focuses on iOS + Watch quality.

- [ ] **AI reschedule**
  - [ ] "I slept in 30 minutes" → shift all morning timers by 30m
  - [ ] "Skip my next timer" → remove + adjust linked/dependent timers
  - [ ] "Push everything back 1 hour" → bulk shift
  - [ ] Smart suggestions: detect when user dismisses alarm late → "Shift your morning by X minutes?"
  - [ ] Undo reschedule (keep old state for 1 hour)

- [ ] **Gamification polish**
  - [ ] Streak badges: 7-day, 30-day, 100-day
  - [ ] Focus score: weekly score based on on-time rate + focus hours
  - [ ] Weekly summary card (shareable image — key for viral growth)
  - [ ] Gentle celebration animations (confetti for streak milestones, not obnoxious)

### Week 9: iPad + Polish + TestFlight

- [ ] **iPad layout**
  - [ ] iPad sidebar navigation (NavigationSplitView)
  - [ ] Wider timeline with side panel for timer detail
  - [ ] Stage Manager / multiple window support (iPadOS 16+)

- [ ] **Cross-device continuity**
  - [ ] Handoff: start timer on Mac, see it on iPhone and Watch
  - [ ] iCloud sync for timer data (CloudKit)
  - [ ] Shared UserDefaults via App Groups (iPhone ↔ Watch ↔ Widget)

- [ ] **Accessibility**
  - [ ] VoiceOver: all screens navigable, timer states announced
  - [ ] Dynamic Type: all text scales
  - [ ] Reduce Motion: disable animations when system setting is on
  - [ ] High Contrast mode support

- [ ] **XCTest + XCUITest**
  - [ ] Unit tests for timer engine (mirroring web Vitest tests)
  - [ ] Unit tests for cascade, recurrence, NL parser
  - [ ] UI tests: create timer → verify timeline → fire → dismiss
  - [ ] Widget snapshot tests

- [ ] **TestFlight**
  - [ ] Internal build: team testing
  - [ ] External beta: 100 testers via TestFlight link
  - [ ] Crash reporting: built-in MetricKit
  - [ ] Feedback form in Settings
  - [ ] App Store submission prepared (screenshots, description, keywords, preview video)

### Phase 3 Exit Criteria

- [ ] iOS app installs and all features work on iPhone 14+ (iOS 17)
- [ ] iPad layout works with sidebar navigation (iPadOS 16+)
- [ ] Apple Watch complications update correctly on Watch Series 8+ (watchOS 10)
- [ ] Live Activities show on Dynamic Island and Lock Screen
- [ ] Widgets update on home screen and lock screen
- [ ] Siri Shortcuts work for top 3 use cases
- [ ] AI reschedule correctly shifts timers
- [ ] All XCTests and XCUITests pass
- [ ] TestFlight beta: 100 external testers, crash-free rate > 99%
- [ ] App Store submission prepared and submitted (screenshots, description, keywords, preview video)
- [ ] macOS deferred to Phase 4

---

## Phase 4: Context & Growth — "Make It Sticky" (Week 10-14)

> **Goal:** macOS menu bar, calendar sync, location awareness, cloud sync, and viral growth mechanics.
> **Success criteria:** Users say "ChronoMind knows my schedule better than I do."

### Week 10-11: macOS + Calendar + Location

- [ ] **macOS menu bar app (`ChronoMindMac/`)** — deferred from Phase 3
  - [ ] Menu bar icon: shows countdown of next timer
  - [ ] Click → popover with mini timeline
  - [ ] Quick timer creation from popover
  - [ ] Notification center integration (UNUserNotificationCenter)
  - [ ] Keyboard shortcut: `Cmd+Shift+T` → quick timer
  - [ ] Share 90%+ code with iOS via Shared/ folder

- [ ] **Full calendar sync**
  - [ ] Google Calendar OAuth 2.0 integration
  - [ ] Apple Calendar (EventKit) read access
  - [ ] Outlook Calendar (Microsoft Graph API) integration
  - [ ] One-way sync: imported events become timers with auto-cascade (read-only — ChronoMind does NOT write back to calendars)
  - [ ] Conflict resolution: calendar events take priority, manual timers preserved
  - [ ] Sync frequency: every 15 minutes + on-demand refresh
  - [ ] Visual distinction: synced events vs manual timers on timeline
  - [ ] Web: OAuth flow in Next.js API routes
  - [ ] iOS: EventKit for Apple Calendar, OAuth for Google/Outlook

- [ ] **Location-based triggers**
  - [ ] iOS: CoreLocation geofencing (enter/exit region)
  - [ ] "Remind me when I leave home" → geofence exit trigger
  - [ ] "Remind me when I arrive at office" → geofence enter trigger
  - [ ] Saved locations: Home, Work, Gym (user-configured)
  - [ ] Privacy-first: all location processing on-device, no server tracking
  - [ ] Web: use Geolocation API (less reliable, best-effort)

- [ ] **Travel time intelligence**
  - [ ] Apple Maps API (MapKit) for travel time estimates
  - [ ] "Your dentist appointment is in 45 minutes. Leave now — 28 min drive with current traffic."
  - [ ] Auto-adjust pre-warning cascade based on real-time travel time
  - [ ] Transport mode: driving, transit, walking (user preference per timer)
  - [ ] Web: fallback to static estimate (user enters travel time manually)

### Week 12: Sleep + Wellness

- [ ] **Sleep integration**
  - [ ] Bedtime routine: customizable wind-down sequence
  - [ ] Smart alarm: set a wake window (e.g., 6:30-7:00) → alarm fires at optimal time
  - [ ] Sleep tracking via HealthKit (Apple) — read sleep data, don't track directly
  - [ ] "You slept 6h 20m. Shift your morning by 15 minutes?" (AI reschedule tie-in)
  - [ ] Wind-down notifications: "Bedtime in 30 minutes — start winding down"
  - [ ] Blue light reminder: "Consider turning on Night Shift"

- [ ] **Mood/energy check-in**
  - [ ] Quick check-in after completing a timer/routine: 😴 😐 😊 🔥 (4 energy levels)
  - [ ] Correlate mood with time of day, timer type, sleep data
  - [ ] Weekly insight: "You're most productive between 9-11 AM"
  - [ ] Optional: prompt at consistent times (morning, post-lunch, evening)
  - [ ] All data local — never sent to any server

- [ ] **Cloud sync (Apple-only via iCloud, privacy-first)**
  - [ ] iCloud/CloudKit sync for Apple devices only (iPhone ↔ Mac ↔ Watch)
  - [ ] Sync scope: timers, routines, categories, preferences, stats
  - [ ] Conflict resolution: last-write-wins with vector clocks
  - [ ] Opt-in: works perfectly offline, sync is a bonus
  - [ ] **Cross-platform sync (web ↔ Android) deferred to Phase 5** via platform-service REST API
  - [ ] TLS in transit + encrypted at rest in Cosmos DB (E2E encryption deferred — timer data is not sensitive enough to justify complexity)
  - [ ] Delete account: wipes all cloud data immediately

- [ ] **Data export / account deletion (App Store + GDPR requirement)**
  - [ ] "Export all my data" → JSON download of all timers, routines, stats
  - [ ] "Delete my account" → wipe all cloud data, revoke tokens
  - [ ] Required before App Store submission (Apple requirement since 2022)

- [ ] **Advanced NL parsing (upgrade path from chrono-node)**
  - [ ] Define `timer-parse` extraction task in extraction-service (port 4005)
  - [ ] Classes: `time`, `duration`, `urgency_hint`, `label`, `recurrence`
  - [ ] Use `@bytelyst/extraction` client for LLM-powered parsing
  - [ ] Falls back to chrono-node if extraction-service unavailable
  - [ ] Enables: "Set a critical alarm for my dentist next Tuesday at 2pm with 1 hour warning and 30 min travel time"

### Week 13-14: Viral Growth Mechanics

- [ ] **Shareable weekly summary**
  - [ ] Auto-generated card: "This week: 47 timers completed, 12h focused, 14-day streak 🔥"
  - [ ] Beautiful design (dark bg, accent colors, ChronoMind branding)
  - [ ] Share to: Instagram Stories, Twitter/X, LinkedIn, iMessage
  - [ ] Deep link back to ChronoMind (UTM tracked)
  - [ ] **This is the #1 viral mechanic — make it irresistible to share**

- [ ] **Shareable timer**
  - [ ] Create a timer and share link: "chronom.ind/t/abc123"
  - [ ] Recipient opens link → timer auto-added to their ChronoMind
  - [ ] Use case: "Here's the pasta recipe timing" / "Here's our meeting prep timer"
  - [ ] Web link works without app (PWA fallback)
  - [ ] iOS: Universal Link → opens app directly

- [ ] **Referral program**
  - [ ] "Invite a friend → both get 1 month Pro free"
  - [ ] Unique referral code per user
  - [ ] Track referral chain
  - [ ] Show referral count in profile

- [ ] **ProductHunt launch prep**
  - [ ] Maker profile + product page
  - [ ] Launch video (30s demo: create timer → cascade fires → Watch notification)
  - [ ] 5 key screenshots (timeline, Watch, Dynamic Island, routine, focus)
  - [ ] First comment prepared (story of why this exists)
  - [ ] Schedule for Tuesday 12:01 AM PT (optimal PH launch time)

- [ ] **App Store Optimization (ASO)**
  - [ ] Keywords: "smart timer", "pre-warning alarm", "visual timeline", "focus timer", "routine timer", "ADHD timer", "pomodoro"
  - [ ] 10 screenshots: iPhone (6.7" + 6.1"), iPad, Apple Watch, Mac
  - [ ] App preview video (15-30s)
  - [ ] Subtitle: "Smart Pre-Warning Timer & Routines"
  - [ ] Category: Productivity (primary), Lifestyle (secondary)

- [ ] **Content marketing**
  - [ ] Blog post: "Why I Built ChronoMind — The Timer App That Understands Urgency"
  - [ ] Twitter/X thread: "I analyzed every timer app. Here's what they all get wrong. 🧵"
  - [ ] Reddit posts: r/productivity, r/ADHD, r/apple, r/webdev
  - [ ] Hacker News: "Show HN: ChronoMind — AI-powered pre-warning timer (PWA + iOS)"
  - [ ] YouTube: 3-minute walkthrough video

- [ ] **SEO landing page**
  - [ ] Target pages: "best timer app 2026", "ADHD timer app", "pre-warning alarm app"
  - [ ] Comparison pages: "ChronoMind vs Tiimo", "ChronoMind vs Structured"
  - [ ] Blog with timer/productivity tips (SEO content)

### Phase 4 Exit Criteria

- [ ] macOS menu bar app works on macOS 14+ (deferred from Phase 3)
- [ ] Calendar sync works with Google, Apple, Outlook calendars (one-way)
- [ ] Location triggers fire reliably (iOS geofencing)
- [ ] Travel time estimates adjust pre-warning cascade
- [ ] Sleep data integration working via HealthKit
- [ ] Data export and account deletion functional
- [ ] Weekly summary card shareable to 3+ social platforms
- [ ] Shareable timer links work (web + iOS universal link)
- [ ] ProductHunt page live, launch scheduled
- [ ] App Store listing approved and live
- [ ] 500+ users (web + iOS combined)
- [ ] 4.5+ star rating on App Store (from beta testers)

---

## Phase 5: Android + Scale — "Reach Everyone" (Week 15-22)

> **Goal:** Ship Android + Wear OS, shared timers, and reach product-market fit.
> **Success criteria:** 5,000 MAU, 4.5+ stars on both App Store and Play Store.

### Week 15-17: Android App

- [ ] **Android project setup**
  - [ ] Jetpack Compose + Material 3 + Kotlin
  - [ ] Room database (mirroring SwiftData schema)
  - [ ] Hilt for dependency injection
  - [ ] Minimum SDK: API 26 (Android 8.0)
  - [ ] Gradle version catalog for dependency management

- [ ] **Timer engine Kotlin port (`TimerEngine/`)**
  - [ ] Port from Swift (which was ported from TypeScript) — all same logic
  - [ ] `Cascade.kt`, `Urgency.kt`, `Recurrence.kt`, `Scheduler.kt`, `NLParser.kt`
  - [ ] JUnit5 tests mirroring XCTest and Vitest tests
  - [ ] **Estimated effort: 2-3 days** (same as Swift port)

- [ ] **Android screens (Jetpack Compose)**
  - [ ] `TimelineScreen` — vertical timeline
  - [ ] `CreateTimerScreen` — alarm, countdown, Pomodoro
  - [ ] `RoutineScreen` — list + runner
  - [ ] `FocusScreen` — focus/Pomodoro session
  - [ ] `HistoryScreen` — stats, streaks, history
  - [ ] `SettingsScreen` — preferences, categories, neurodivergent mode
  - [ ] Bottom navigation matching iOS tab structure

- [ ] **Android notifications**
  - [ ] `AlarmManager` for exact alarm scheduling (pre-warnings)
  - [ ] Notification channels per urgency level
  - [ ] Full-screen intent for CRITICAL urgency
  - [ ] Notification actions: Snooze, Dismiss
  - [ ] Foreground service for active countdown display
  - [ ] `SCHEDULE_EXACT_ALARM` permission handling (Android 12+)

- [ ] **Android widgets**
  - [ ] Glance widgets (Jetpack Glance)
  - [ ] Small: next timer countdown
  - [ ] Medium: next 3 timers
  - [ ] Large: mini timeline
  - [ ] Widget tap → deep link to timer

- [ ] **Android-specific features**
  - [ ] Quick Settings tile: one-tap to create quick timer
  - [ ] Persistent notification during active timer
  - [ ] DND integration: timer-aware Do Not Disturb
  - [ ] Google Calendar integration (CalendarContract)

### Week 18-19: Wear OS + Polish

- [ ] **Wear OS app**
  - [ ] Compose for Wear OS
  - [ ] `WearTimelineScreen` — scrollable timeline
  - [ ] `WearTimerScreen` — countdown with rotary input
  - [ ] Tile: next timer complication
  - [ ] Haptic pre-warnings
  - [ ] Dismiss/snooze from wrist

- [ ] **Cross-platform cloud sync (via platform-service)**
  - [ ] Sync API: platform-service REST endpoints for timer CRUD + sync (`productId: "chronomind"`)
  - [ ] JWT authentication via @bytelyst/auth (reuse existing module)
  - [ ] TLS in transit + encrypted at rest in Cosmos DB
  - [ ] Sync protocol: last-write-wins with conflict detection
  - [ ] Works across: Web ↔ iOS ↔ macOS ↔ Android (replaces Phase 4 iCloud-only sync)
  - [ ] Account creation: Apple Sign-In / Google Sign-In (email/password requires platform-service Email Delivery + Password Reset — may not be ready)
  - [ ] Register `chronomind` as product in platform-service products module

### Week 20-21: Shared Timers + Social

- [ ] **Shared timers (Family/Household)**
  - [ ] Create a "household" group (invite via link)
  - [ ] Shared timers visible to all household members
  - [ ] Real-time sync: one person starts timer, everyone sees it
  - [ ] Use cases: "Dinner in 30 minutes", "Leave for school in 15 min"
  - [ ] Per-timer: shared vs private toggle
  - [ ] Household admin: manage members, remove shared timers
  - [ ] Up to 6 members per household (Family tier)

- [ ] **Body doubling / shared focus (deferred to v3)**
  - [ ] _Experimental feature requiring real-time infrastructure (Event Bus). Defer until platform gap component 2.4 is built._
  - [ ] v3 scope: "Focus room" — virtual co-working, see others' timers (anonymized), shared ambiance

- [ ] **API + webhooks**
  - [ ] REST API: CRUD timers, routines, categories
  - [ ] API key authentication
  - [ ] Webhook: `timer.fired`, `timer.dismissed`, `routine.completed`
  - [ ] Use cases: Zapier integration, smart home triggers
  - [ ] Rate limiting: 100 requests/minute per API key

- [ ] **Smart Home integration**
  - [ ] Webhook-based triggers to HomeKit/Alexa/Google Home
  - [ ] "When wind-down routine starts → dim lights to 30%"
  - [ ] "When morning alarm fires → turn on coffee machine"
  - [ ] Shortcuts integration (iOS) for HomeKit scenes
  - [ ] IFTTT applet for cross-platform home automation

### Week 22: Launch + Scale

- [ ] **Google Play launch**
  - [ ] Play Store listing (screenshots, description, video)
  - [ ] Play Store Optimization (similar keywords as App Store)
  - [ ] Internal testing → Open testing → Production
  - [ ] Crash reporting: Firebase Crashlytics

- [ ] **Monetization activation**
  - [ ] Free tier: all core features, local storage, Pomodoro, routines
  - [ ] Pro tier ($3.99/mo or $29.99/yr): cloud sync, calendar integration, custom sounds, AI reschedule, advanced stats, location triggers
  - [ ] Family tier ($5.99/mo): shared timers (up to 6 members), household coordination
  - [ ] Stripe integration (web), StoreKit 2 (iOS), Google Play Billing (Android)
  - [ ] Paywall: soft — show feature, explain it's Pro, easy upgrade
  - [ ] 7-day free trial for Pro

- [ ] **Voice control (v2 feature)**
  - [ ] In-app voice: "Push everything back 30 minutes"
  - [ ] Siri Shortcuts (already done in Phase 3)
  - [ ] Google Assistant Actions
  - [ ] Alexa Skill (stretch goal)

- [ ] **Performance + scale**
  - [ ] Web: Core Web Vitals all green
  - [ ] iOS: 60fps animations, < 50MB app size
  - [ ] Android: 60fps, < 40MB APK
  - [ ] Watch: complications update within 15 minutes
  - [ ] Sync API: < 200ms p99 latency
  - [ ] 10,000 MAU target infrastructure

### Phase 5 Exit Criteria

- [ ] Android app live on Google Play, 4.5+ stars
- [ ] Wear OS app functional on Pixel Watch / Galaxy Watch
- [ ] Cross-platform sync working (web ↔ iOS ↔ Android)
- [ ] Shared timers working for households (up to 6 members)
- [ ] API + webhooks functional for automation
- [ ] Monetization: Pro + Family tiers active, > 5% conversion rate
- [ ] 5,000+ MAU across all platforms
- [ ] < 0.1% crash rate on all platforms
- [ ] Customer support: < 24h response time

---

## Success & Viral Playbook

### Metrics That Matter

| Metric | MVP Target (Phase 1-2) | v1 Target (Phase 3-4) | v2 Target (Phase 5) |
|--------|------------------------|----------------------|---------------------|
| **PWA installs** | 100 | 500 | 2,000 |
| **DAU** | 50 | 200 | 1,000 |
| **MAU** | 150 | 1,000 | 5,000 |
| **DAU/MAU ratio** | > 33% | > 50% | > 50% |
| **Timers created/week** | 500+ | 5,000+ | 25,000+ |
| **Pre-warning usage** | > 60% of timers | > 70% | > 75% |
| **Routine creation** | > 20% of users | > 30% | > 35% |
| **7-day retention** | > 30% | > 40% | > 50% |
| **30-day retention** | > 15% | > 25% | > 30% |
| **App Store rating** | — | 4.5+ | 4.5+ |
| **Pro conversion** | — | > 3% | > 5% |
| **Streak > 7 days** | — | > 15% of users | > 25% |
| **Shared summary** | — | > 10% weekly | > 20% |
| **Snooze rate** | < 40% | < 30% | < 25% |

### Viral Growth Loops

```
Loop 1: Weekly Summary Share
User completes week → Beautiful summary card generated → Shares to social → 
Friend sees → Clicks link → Downloads ChronoMind → Repeat

Loop 2: Shared Timer
User creates timer → Shares link with friend/family → Friend opens link →
Timer auto-added → Friend discovers app → Downloads → Repeat

Loop 3: Household Invite
User activates Family plan → Invites household → Members join → 
Members invite THEIR friends → Organic growth

Loop 4: Content / SEO
User writes about experience → Blog/Reddit/Twitter → Organic search →
New user finds ChronoMind → Downloads → Repeat
```

### What Makes ChronoMind Go Viral

1. **The "aha" moment** — First time a pre-warning fires and user thinks "I would have been late without this." Target: within first 24 hours of use.

2. **Shareable summaries** — Weekly stats card must be *beautiful* enough that users *want* to share it. Design it like a Spotify Wrapped card. Include streak count, focus hours, on-time rate.

3. **Apple Watch as walking billboard** — When someone glances at their Watch and sees a ChronoMind complication, their friend asks "What's that?" Word of mouth.

4. **Routine templates** — "I use ChronoMind's Morning Routine template and it changed my life" → shareable templates that spread.

5. **Neurodivergent community** — The ADHD community is vocal and supportive online. If ChronoMind genuinely helps with time blindness, they'll evangelize it. Target: r/ADHD, ADHD TikTok, ADHD Twitter.

6. **ProductHunt launch** — Target top 5 on launch day. Prepare months in advance with a supporter base.

7. **"Replace 3 apps" narrative** — Position ChronoMind as replacing Clock + Pomodoro + Routine app. Users love consolidation stories.

### Pricing Strategy for Growth

```
Phase 1-2 (Web MVP):     100% free — no friction, maximum adoption
Phase 3 (iOS launch):    100% free — build App Store momentum and reviews
Phase 4 (Growth):        Introduce Pro — soft paywall on advanced features
Phase 5 (Scale):         Pro + Family — monetize power users and households

Free forever:            Timers, alarms, countdowns, Pomodoro, routines,
                         visual timeline, pre-warnings, neurodivergent mode,
                         stats, streaks, categories, keyboard shortcuts

Pro ($3.99/mo):          Calendar sync, location triggers, cloud sync,
                         custom sounds, AI reschedule, advanced analytics,
                         travel time, export, priority support

Family ($5.99/mo):       Everything in Pro + shared timers (6 members),
                         household coordination, family routines
```

---

## Risk Register

| # | Risk | Severity | Phase | Mitigation |
|---|------|----------|-------|------------|
| 1 | PWA notifications unreliable on iOS | High | 1 | Tab title countdown + native iOS app in Phase 3 |
| 2 | Feature creep delays MVP | High | 1-2 | Strict scope: alarm + countdown + Pomodoro only for Phase 1 |
| 3 | Apple Watch complications don't update reliably | Medium | 3 | Budget for watchOS debugging; use TimelineProvider with aggressive updates |
| 4 | Calendar OAuth complexity | Medium | 4 | Start with .ics import (Phase 2); full OAuth only in Phase 4 |
| 5 | Competition adds pre-warnings | Medium | All | Ship fast; cascade + urgency + linked timers is hard to replicate |
| 6 | Low App Store visibility | Medium | 3-4 | ASO from day 1; ProductHunt launch; content marketing |
| 7 | Sync conflicts across platforms | Medium | 4-5 | Start with iCloud (Apple-only); cross-platform sync in Phase 5 |
| 8 | Android notification restrictions (Doze, exact alarms) | Medium | 5 | Use `AlarmManager.setExactAndAllowWhileIdle()`; request permissions |
| 9 | User overwhelm — too many features | Medium | 2+ | Progressive disclosure; smart defaults; neurodivergent-friendly default |
| 10 | Monetization too early kills growth | Low | 4 | Free for 3 phases; only monetize when PMF is proven |
| 11 | Platform-service Email Delivery not ready for Phase 4 accounts | Medium | 4 | Fallback: Apple Sign-In / Google Sign-In only (skip email/password) |
| 12 | Platform-service Event Bus not ready for Phase 5 shared timers | Medium | 5 | Fallback: polling (30s interval) instead of real-time push |
| 13 | Service Worker termination loses timer state | Medium | 1 | Persist all state to IndexedDB; SW checks timestamps on wake, not in-memory |
| 14 | Design token conflict with ByteLyst ecosystem | Low | 1 | ChronoMind gets own product section in token file; shared base, own semantics |

---

## Key Milestones & Dates

| Milestone | Target Date | Phase | Celebration |
|-----------|-------------|-------|-------------|
| **MVP shipped** (web PWA live) | Week 2 | 1 | First 10 users 🎉 |
| **Intelligence complete** (routines, NL, focus) | Week 5 | 2 | ProductHunt scheduled |
| **iOS + Watch on TestFlight** | Week 9 | 3 | 100 beta testers |
| **App Store launch** | Week 10 | 3→4 | ProductHunt same week |
| **1,000 MAU** | Week 14 | 4 | Blog post celebrating |
| **Android launch** | Week 18 | 5 | Play Store live |
| **5,000 MAU** | Week 22 | 5 | Series of viral pushes |
| **Monetization live** | Week 20 | 5 | Pro + Family tiers |

---

## Appendix: Tech Stack Summary

| Platform | Framework | Key Libraries | Storage | Notifications |
|----------|-----------|--------------|---------|---------------|
| **Web** | Next.js 16, React 19 | TailwindCSS v4, shadcn/ui, Zustand, Serwist, chrono-node, date-fns, Recharts | IndexedDB (idb) | Web Push + Service Worker |
| **iOS** | SwiftUI (iOS 17+) | SwiftData, WidgetKit, ActivityKit, EventKit, CoreLocation | SwiftData | UNUserNotificationCenter |
| **watchOS** | SwiftUI (watchOS 10+) | WidgetKit (complications) | App Groups shared | WKExtension notifications |
| **macOS** | SwiftUI (macOS 14+) | AppKit (menu bar) | SwiftData (shared via iCloud) | UNUserNotificationCenter |
| **Android** | Jetpack Compose | Material 3, Room, Hilt, Glance (widgets), AlarmManager | Room (SQLite) | NotificationManager + AlarmManager |
| **Wear OS** | Compose for Wear OS | Tiles, Complications, Rotary Input | Room (shared) | Wearable notifications |
| **Sync API** | Platform-service (Fastify 5, port 4003) in `learning_ai_common_plat` | @bytelyst/auth (JWT), @bytelyst/cosmos, @bytelyst/config | Azure Cosmos DB (`productId: "chronomind"`) | Platform-service notifications module |

---

## Appendix B: Cost Estimation

| Item | Phase | Monthly Cost | Notes |
|------|-------|-------------|-------|
| **Vercel (web hosting)** | 1+ | $0 (free tier) | Hobby plan covers MVP easily |
| **Domain** | 1+ | ~$12/yr | `.app` or `.io` domain |
| **Azure Cosmos DB** | 4+ | ~$25-50/mo | Serverless tier, `productId: "chronomind"` partition |
| **Apple Developer Program** | 3+ | $99/yr | Required for App Store + TestFlight |
| **Google Play Console** | 5+ | $25 one-time | Required for Play Store |
| **Plausible Analytics** | 1+ | $0 (self-hosted) or $9/mo | Or use platform-service telemetry (free) |
| **Stripe** | 5+ | 2.9% + 30¢ per transaction | Pro/Family subscription processing |
| **Total (Phase 1-3)** | | ~$10/mo | Minimal — mostly free tiers |
| **Total (Phase 4-5)** | | ~$75-100/mo | Cosmos DB + domain + Apple program |

> **Note:** Platform-service infrastructure (Cosmos DB, AKV, health checks) is shared with LysnrAI. ChronoMind's incremental cost is only additional Cosmos RUs for timer data.

---

## Appendix C: Common Platform Reusability

ChronoMind reuses **13 shared packages** and **17+ platform-service modules** from `learning_ai_common_plat`:

| Package | ChronoMind Use | Phase |
|---------|---------------|-------|
| @bytelyst/auth | JWT auth for Pro/Family accounts | 4-5 |
| @bytelyst/react-auth | Web dashboard auth context | 4-5 |
| @bytelyst/api-client | Web → sync API calls | 4-5 |
| @bytelyst/config | Config + `productId: "chronomind"` + AKV | 4-5 |
| @bytelyst/cosmos | Cosmos DB for cloud sync, shared timers | 4-5 |
| @bytelyst/errors | Typed HTTP errors | 4-5 |
| @bytelyst/logger | Server-side structured logging | 4-5 |
| @bytelyst/design-tokens | Cross-platform design system | 1+ |
| @bytelyst/monitoring | Health-check utilities | 5 |
| @bytelyst/blob | Custom alarm sound uploads | 5 |
| @bytelyst/extraction | Advanced NL parsing via extraction-service | 4+ |
| @bytelyst/testing | Shared test mocks | 4-5 |
| @bytelyst/fastify-core | Service app factory | 5 |

**New platform-service modules needed (4):**
- `timers` — timer CRUD + sync for `productId: "chronomind"`
- `routines` — routine CRUD + sync
- `shared-timers` — household shared timer management
- `households` — household membership + invitations

---

## Appendix D: Key Decisions

| # | Decision | Options | Recommendation | Rationale |
|---|----------|---------|----------------|-----------|
| 1 | Backend stack | Platform-service vs Cloudflare Workers | **Platform-service** | Reuses 17+ existing modules |
| 2 | Apple-only sync | CloudKit vs skip until Phase 5 | **CloudKit for Phase 3-4** | Free, fast for Apple-only |
| 3 | E2E encryption | Full E2E vs TLS + at-rest | **TLS + at-rest** | Timer data not sensitive enough |
| 4 | Real-time shared timers | WebSocket vs SSE vs polling | **SSE + polling fallback** | WebSocket overkill for timers |
| 5 | Design tokens | Extend bytelyst.tokens.json | **ChronoMind product section** | Shared base, own urgency colors |
| 6 | Analytics | Plausible vs PostHog vs telemetry | **Platform-service telemetry** | Free, self-hosted, integrated |
| 7 | Phase 3 scope | iOS + Watch + Mac vs iOS + Watch | **iOS + Watch; Mac in Phase 4** | 4 weeks already aggressive |
| 8 | Calendar sync | Two-way vs one-way | **One-way (read-only)** | Two-way is fragile |
| 9 | Body doubling | Phase 5 vs v3 | **Defer to v3** | Needs Event Bus infrastructure |
| 10 | Domain name | chronomind.app vs .io | **Check availability pre-Phase 1** | Needed for deployment |
| 11 | Open-source | Full vs closed vs hybrid | **Hybrid: open timer engine lib** | Credibility + community |
| 12 | Windows/Tauri | Phase 5 vs Phase 6 vs v3 | **Defer to v3** | Focus on mobile first |
| 13 | AKV secrets | Own CHRONO_SECRETS vs share | **Share Cosmos/JWT, own Stripe** | productId partitions data |
| 14 | Fonts | ByteLyst (DM Sans) vs own (Inter) | **Own: Inter + JetBrains Mono** | Superior digit rendering |

> **Windows/Tauri note:** PRD lists Windows as v2.0 target. Deferred to v3 — insufficient market signal to justify Tauri investment before mobile platforms are stable. Revisit after Phase 5 Android launch.