diff --git a/packages/kotlin-platform-sdk/src/main/kotlin/com/bytelyst/platform/BLFeedbackClient.kt b/packages/kotlin-platform-sdk/src/main/kotlin/com/bytelyst/platform/BLFeedbackClient.kt
new file mode 100644
index 00000000..efd58d4c
--- /dev/null
+++ b/packages/kotlin-platform-sdk/src/main/kotlin/com/bytelyst/platform/BLFeedbackClient.kt
@@ -0,0 +1,267 @@
+package com.bytelyst.platform
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.view.View
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.jsonPrimitive
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+import java.io.ByteArrayOutputStream
+import java.util.Locale
+import java.util.concurrent.TimeUnit
+
+/**
+ * Feedback client for submitting user feedback with optional screenshots.
+ *
+ * TODO-3: Full implementation for Android
+ *
+ * Flow:
+ * 1. Capture screenshot (optional)
+ * 2. Get SAS URL for upload
+ * 3. Upload screenshot to blob storage
+ * 4. Submit feedback with metadata
+ */
+class BLFeedbackClient(
+    private val config: BLPlatformConfig,
+    private val tokenProvider: () -> String? = { null },
+) {
+    enum class FeedbackType {
+        BUG, FEATURE, PRAISE, OTHER
+    }
+
+    enum class ScreenshotFormat {
+        PNG, JPEG, WEBP
+    }
+
+    data class DeviceContext(
+        val osVersion: String,
+        val appVersion: String,
+        val deviceModel: String,
+        val screenResolution: String,
+        val locale: String,
+    ) {
+        companion object {
+            fun fromContext(context: Context): DeviceContext {
+                val displayMetrics = context.resources.displayMetrics
+                return DeviceContext(
+                    osVersion = android.os.Build.VERSION.RELEASE,
+                    appVersion = context.packageManager.getPackageInfo(
+                        context.packageName, 0
+                    ).versionName ?: "unknown",
+                    deviceModel = "${android.os.Build.MANUFACTURER} ${android.os.Build.MODEL}",
+                    screenResolution = "${displayMetrics.widthPixels}x${displayMetrics.heightPixels}",
+                    locale = Locale.getDefault().toString(),
+                )
+            }
+        }
+    }
+
+    @Serializable
+    data class SasResponse(
+        val blobPath: String,
+        val uploadUrl: String,
+        val expiresIn: Int,
+        val maxSizeBytes: Int,
+    )
+
+    @Serializable
+    data class FeedbackResponse(
+        val id: String,
+        val productId: String,
+        val userId: String,
+        val type: String,
+        val title: String,
+        val status: String,
+        val createdAt: String,
+        val screenshotBlobPath: String? = null,
+    )
+
+    data class FeedbackParams(
+        val type: FeedbackType,
+        val title: String,
+        val body: String? = null,
+        val screen: String? = null,
+        val rating: Int? = null,
+        val screenshot: Pair<ByteArray, ScreenshotFormat>? = null,
+        val deviceContext: DeviceContext? = null,
+    )
+
+    private val json = Json { ignoreUnknownKeys = true }
+    private val platformClient = BLPlatformClient(config, tokenProvider)
+    private val uploadClient = OkHttpClient.Builder()
+        .connectTimeout(60, TimeUnit.SECONDS)
+        .writeTimeout(120, TimeUnit.SECONDS)
+        .readTimeout(30, TimeUnit.SECONDS)
+        .build()
+
+    /**
+     * Submit feedback with optional screenshot.
+     *
+     * TODO-3: Full implementation
+     */
+    suspend fun submitFeedback(params: FeedbackParams): FeedbackResponse? = withContext(Dispatchers.IO) {
+        try {
+            // Step 1: Handle screenshot upload if provided
+            var screenshotMeta: Triple<String, String, Int>? = null
+            params.screenshot?.let { (data, format) ->
+                val contentType = when (format) {
+                    ScreenshotFormat.PNG -> "image/png"
+                    ScreenshotFormat.JPEG -> "image/jpeg"
+                    ScreenshotFormat.WEBP -> "image/webp"
+                }
+
+                // Get SAS URL
+                val sas = generateSASUrl(contentType) ?: return@withContext null
+
+                // Upload screenshot
+                val uploaded = uploadScreenshot(data, sas.uploadUrl, contentType)
+                if (!uploaded) return@withContext null
+
+                screenshotMeta = Triple(sas.blobPath, contentType, data.size)
+            }
+
+            // Step 2: Submit feedback
+            val body = buildMap {
+                put("type", params.type.name.lowercase())
+                put("title", params.title)
+                params.body?.let { put("body", it) }
+                params.screen?.let { put("screen", it) }
+                params.rating?.let { put("rating", it) }
+                screenshotMeta?.let { (path, type, size) ->
+                    put("screenshotBlobPath", path)
+                    put("screenshotContentType", type)
+                    put("screenshotSizeBytes", size)
+                }
+                params.deviceContext?.let { ctx ->
+                    put("deviceContext", mapOf(
+                        "osVersion" to ctx.osVersion,
+                        "appVersion" to ctx.appVersion,
+                        "deviceModel" to ctx.deviceModel,
+                        "screenResolution" to ctx.screenResolution,
+                        "locale" to ctx.locale,
+                    ))
+                }
+            }
+
+            // TODO-3: Implement actual API call
+            throw NotImplementedError(
+                "submitFeedback API call not yet implemented. " +
+                "Use platformClient.request(\"POST\", \"/api/feedback\", jsonBody)"
+            )
+        } catch (_: Exception) {
+            null
+        }
+    }
+
+    /**
+     * Capture screenshot and submit feedback in one operation.
+     *
+     * TODO-3: Full implementation using MediaProjection or View.draw()
+     */
+    suspend fun captureAndSubmit(
+        context: Context,
+        type: FeedbackType,
+        title: String,
+        body: String? = null,
+    ): FeedbackResponse? {
+        throw NotImplementedError(
+            "captureAndSubmit not yet implemented.\n\n" +
+            "To implement:\n" +
+            "1. Option A - MediaProjection API (requires permission):\n" +
+            "   - Request MediaProjection permission\n" +
+            "   - Use MediaProjection.createVirtualDisplay()\n" +
+            "   - Capture ImageReader frame\n\n" +
+            "2. Option B - View.draw() (limited to app window):\n" +
+            "   - val view = window.decorView.rootView\n" +
+            "   - val bitmap = Bitmap.createBitmap(view.width, view.height)\n" +
+            "   - val canvas = Canvas(bitmap)\n" +
+            "   - view.draw(canvas)\n\n" +
+            "3. Convert Bitmap to ByteArray\n" +
+            "4. Call submitFeedback with screenshot"
+        )
+    }
+
+    /**
+     * Capture current screen as Bitmap.
+     *
+     * TODO-3: Full implementation
+     */
+    fun captureScreen(): Bitmap {
+        throw NotImplementedError(
+            "captureScreen requires MediaProjection API. " +
+            "See: https://developer.android.com/reference/android/media/projection/MediaProjection"
+        )
+    }
+
+    /**
+     * Capture specific View as Bitmap.
+     *
+     * TODO-3: Full implementation
+     */
+    fun captureView(view: View): Bitmap {
+        val bitmap = Bitmap.createBitmap(view.width, view.height, Bitmap.Config.ARGB_8888)
+        val canvas = android.graphics.Canvas(bitmap)
+        view.draw(canvas)
+        return bitmap
+    }
+
+    /**
+     * Convert Bitmap to PNG ByteArray.
+     */
+    fun bitmapToBytes(bitmap: Bitmap, format: ScreenshotFormat = ScreenshotFormat.PNG): ByteArray {
+        val androidFormat = when (format) {
+            ScreenshotFormat.PNG -> Bitmap.CompressFormat.PNG
+            ScreenshotFormat.JPEG -> Bitmap.CompressFormat.JPEG
+            ScreenshotFormat.WEBP -> Bitmap.CompressFormat.WEBP_LOSSY
+        }
+        val stream = ByteArrayOutputStream()
+        bitmap.compress(androidFormat, 90, stream)
+        return stream.toByteArray()
+    }
+
+    // MARK: - Private
+
+    private suspend fun generateSASUrl(contentType: String): SasResponse? = withContext(Dispatchers.IO) {
+        try {
+            val body = json.encodeToString(
+                kotlinx.serialization.builtins.MapSerializer(
+                    kotlinx.serialization.builtins.serializer<String>(),
+                    kotlinx.serialization.builtins.serializer<String>(),
+                ),
+                mapOf("contentType" to contentType),
+            )
+            val response = platformClient.request("POST", "/api/feedback/sas", body)
+            json.decodeFromString(SasResponse.serializer(), response)
+        } catch (_: Exception) {
+            null
+        }
+    }
+
+    private suspend fun uploadScreenshot(
+        data: ByteArray,
+        sasUrl: String,
+        contentType: String,
+    ): Boolean = withContext(Dispatchers.IO) {
+        try {
+            val request = Request.Builder()
+                .url(sasUrl)
+                .put(data.toRequestBody(contentType.toMediaType()))
+                .header("x-ms-blob-type", "BlockBlob")
+                .header("x-ms-blob-content-type", contentType)
+                .build()
+
+            uploadClient.newCall(request).execute().use { response ->
+                response.isSuccessful
+            }
+        } catch (_: Exception) {
+            false
+        }
+    }
+}
diff --git a/packages/swift-platform-sdk/Sources/BLFeedbackClient.swift b/packages/swift-platform-sdk/Sources/BLFeedbackClient.swift
new file mode 100644
index 00000000..efd6e164
--- /dev/null
+++ b/packages/swift-platform-sdk/Sources/BLFeedbackClient.swift
@@ -0,0 +1,269 @@
+// ── Feedback Client ─────────────────────────────────────
+// Submit user feedback with optional screenshot attachments.
+// Part of ByteLystPlatformSDK for all iOS/watchOS/macOS apps.
+//
+// TODO-2: Full implementation for iOS feedback submission
+
+import Foundation
+import UIKit
+
+/// Feedback types supported by the platform.
+public enum BLFeedbackType: String, Codable, Sendable {
+    case bug
+    case feature
+    case praise
+    case other
+}
+
+/// Device context for debugging.
+public struct BLDeviceContext: Codable, Sendable {
+    public let osVersion: String
+    public let appVersion: String
+    public let deviceModel: String
+    public let screenResolution: String
+    public let locale: String
+    
+    public init(
+        osVersion: String,
+        appVersion: String,
+        deviceModel: String,
+        screenResolution: String,
+        locale: String
+    ) {
+        self.osVersion = osVersion
+        self.appVersion = appVersion
+        self.deviceModel = deviceModel
+        self.screenResolution = screenResolution
+        self.locale = locale
+    }
+    
+    /// Auto-detect current device context.
+    public static func current() -> BLDeviceContext {
+        let device = UIDevice.current
+        let screen = UIScreen.main
+        let bounds = screen.bounds
+        let scale = screen.scale
+        
+        return BLDeviceContext(
+            osVersion: device.systemVersion,
+            appVersion: Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "unknown",
+            deviceModel: device.model,
+            screenResolution: "\(Int(bounds.width * scale))x\(Int(bounds.height * scale))",
+            locale: Locale.current.identifier
+        )
+    }
+}
+
+/// Screenshot content types.
+public enum BLScreenshotContentType: String, Codable, Sendable {
+    case png = "image/png"
+    case jpeg = "image/jpeg"
+    case webp = "image/webp"
+}
+
+/// Response from feedback SAS endpoint.
+public struct BLFeedbackSASResponse: Codable, Sendable {
+    public let blobPath: String
+    public let uploadUrl: String
+    public let expiresIn: Int
+    public let maxSizeBytes: Int
+}
+
+/// Response from feedback submission.
+public struct BLFeedbackResponse: Codable, Sendable {
+    public let id: String
+    public let productId: String
+    public let userId: String
+    public let type: String
+    public let title: String
+    public let status: String
+    public let createdAt: String
+    public let screenshotBlobPath: String?
+}
+
+/// Parameters for submitting feedback.
+public struct BLFeedbackParams: Sendable {
+    public let type: BLFeedbackType
+    public let title: String
+    public let body: String?
+    public let screen: String?
+    public let rating: Int?
+    public let screenshot: (data: Data, contentType: BLScreenshotContentType)?
+    public let deviceContext: BLDeviceContext?
+    
+    public init(
+        type: BLFeedbackType,
+        title: String,
+        body: String? = nil,
+        screen: String? = nil,
+        rating: Int? = nil,
+        screenshot: (data: Data, contentType: BLScreenshotContentType)? = nil,
+        deviceContext: BLDeviceContext? = nil
+    ) {
+        self.type = type
+        self.title = title
+        self.body = body
+        self.screen = screen
+        self.rating = rating
+        self.screenshot = screenshot
+        self.deviceContext = deviceContext
+    }
+}
+
+/// Feedback client for submitting user feedback with screenshots.
+/// TODO-2: Full implementation
+public final class BLFeedbackClient {
+    
+    private let config: BLPlatformConfig
+    private let client: BLPlatformClient
+    private let blobClient: BLBlobClient
+    
+    public init(config: BLPlatformConfig, client: BLPlatformClient, blobClient: BLBlobClient) {
+        self.config = config
+        self.client = client
+        self.blobClient = blobClient
+    }
+    
+    // MARK: - Submit Feedback
+    
+    /// Submit feedback with optional screenshot.
+    ///
+    /// Flow:
+    /// 1. If screenshot provided, upload to blob storage
+    /// 2. Submit feedback with screenshot metadata
+    ///
+    /// TODO-2: Full implementation
+    public func submitFeedback(_ params: BLFeedbackParams) async throws -> BLFeedbackResponse {
+        var screenshotMeta: (blobPath: String, contentType: String, sizeBytes: Int)?
+        
+        // Step 1: Handle screenshot upload if provided
+        if let screenshot = params.screenshot {
+            // Get SAS URL for upload
+            let sas = try await generateSASURL(contentType: screenshot.contentType)
+            
+            // Upload screenshot
+            try await uploadScreenshot(data: screenshot.data, sasURL: sas.uploadUrl, contentType: screenshot.contentType.rawValue)
+            
+            screenshotMeta = (
+                blobPath: sas.blobPath,
+                contentType: screenshot.contentType.rawValue,
+                sizeBytes: screenshot.data.count
+            )
+        }
+        
+        // Step 2: Submit feedback
+        var body: [String: Any] = [
+            "type": params.type.rawValue,
+            "title": params.title,
+        ]
+        
+        if let bodyText = params.body { body["body"] = bodyText }
+        if let screen = params.screen { body["screen"] = screen }
+        if let rating = params.rating { body["rating"] = rating }
+        if let meta = screenshotMeta {
+            body["screenshotBlobPath"] = meta.blobPath
+            body["screenshotContentType"] = meta.contentType
+            body["screenshotSizeBytes"] = meta.sizeBytes
+        }
+        if let context = params.deviceContext {
+            body["deviceContext"] = [
+                "osVersion": context.osVersion,
+                "appVersion": context.appVersion,
+                "deviceModel": context.deviceModel,
+                "screenResolution": context.screenResolution,
+                "locale": context.locale,
+            ]
+        }
+        
+        throw BLFeedbackError.notImplemented(
+            "submitFeedback body encoding and API call not yet implemented. " +
+            "Use client.request(path: \"/api/feedback\", method: \"POST\", body: body)"
+        )
+    }
+    
+    /// Capture screenshot and submit feedback in one operation.
+    ///
+    /// TODO-2: Implement using UIApplication.shared.windows or UIScreen
+    public func captureAndSubmit(
+        type: BLFeedbackType,
+        title: String,
+        body: String? = nil
+    ) async throws -> BLFeedbackResponse {
+        throw BLFeedbackError.notImplemented(
+            "captureAndSubmit not yet implemented.\n\n" +
+            "To implement:\n" +
+            "1. Use UIGraphicsImageRenderer or UIScreen to capture\n" +
+            "2. Convert UIImage to Data (PNG/JPEG)\n" +
+            "3. Call submitFeedback with captured data\n\n" +
+            "Example:\n" +
+            "let window = UIApplication.shared.windows.first\n" +
+            "UIGraphicsBeginImageContext(window.bounds.size)\n" +
+            "window.drawHierarchy(in: window.bounds, afterScreenUpdates: true)\n" +
+            "let image = UIGraphicsGetImageFromCurrentImageContext()\n" +
+            "UIGraphicsEndImageContext()"
+        )
+    }
+    
+    // MARK: - Screenshot Capture
+    
+    /// Capture current screen as UIImage.
+    ///
+    /// TODO-2: Full implementation
+    public func captureScreen() async throws -> UIImage {
+        throw BLFeedbackError.notImplemented(
+            "captureScreen not yet implemented. Use UIScreen or UIApplication.shared.windows"
+        )
+    }
+    
+    /// Capture specific UIView as UIImage.
+    ///
+    /// TODO-2: Full implementation
+    public func captureView(_ view: UIView) async throws -> UIImage {
+        throw BLFeedbackError.notImplemented(
+            "captureView not yet implemented. Use UIGraphicsImageRenderer or drawHierarchy"
+        )
+    }
+    
+    // MARK: - Private
+    
+    private func generateSASURL(contentType: BLScreenshotContentType) async throws -> BLFeedbackSASResponse {
+        let body = ["contentType": contentType.rawValue]
+        return try await client.request(
+            path: "/api/feedback/sas",
+            method: "POST",
+            body: body,
+            responseType: BLFeedbackSASResponse.self
+        )
+    }
+    
+    private func uploadScreenshot(data: Data, sasURL: String, contentType: String) async throws {
+        guard let url = URL(string: sasURL) else {
+            throw BLNetworkError.invalidURL(sasURL)
+        }
+        
+        var request = URLRequest(url: url)
+        request.httpMethod = "PUT"
+        request.setValue(contentType, forHTTPHeaderField: "Content-Type")
+        request.setValue("BlockBlob", forHTTPHeaderField: "x-ms-blob-type")
+        request.httpBody = data
+        request.timeoutInterval = 60
+        
+        let (_, response) = try await URLSession.shared.data(for: request)
+        
+        guard let http = response as? HTTPURLResponse,
+              (200...299).contains(http.statusCode) else {
+            throw BLNetworkError.httpError(
+                statusCode: (response as? HTTPURLResponse)?.statusCode ?? 0,
+                message: "Screenshot upload failed"
+            )
+        }
+    }
+}
+
+/// Errors specific to feedback operations.
+public enum BLFeedbackError: Error, Sendable {
+    case notImplemented(String)
+    case uploadFailed(String)
+    case invalidScreenshot
+    case sizeLimitExceeded(Int, max: Int)
+}