diff --git a/packages/swift-platform-sdk/Sources/BLBiometricAuth.swift b/packages/swift-platform-sdk/Sources/BLBiometricAuth.swift
index 0c55faed..9435ec69 100644
--- a/packages/swift-platform-sdk/Sources/BLBiometricAuth.swift
+++ b/packages/swift-platform-sdk/Sources/BLBiometricAuth.swift
@@ -1,11 +1,15 @@
 // ── Biometric Authentication ────────────────────────────────
 // Generic Face ID / Touch ID wrapper using LocalAuthentication.
 // Product apps pass a custom reason string for the biometric prompt.
+// Not available on watchOS — guarded with #if canImport.
 
 import Foundation
+
+#if canImport(LocalAuthentication)
 import LocalAuthentication
 
-/// Generic biometric authentication for all ByteLyst iOS apps.
+/// Generic biometric authentication for all ByteLyst iOS/macOS apps.
+/// Not available on watchOS (LocalAuthentication is iOS/macOS only).
 public enum BLBiometricAuth {
 
     public enum BiometricType {
@@ -70,3 +74,4 @@ public enum BLBiometricAuth {
         }
     }
 }
+#endif
diff --git a/packages/swift-platform-sdk/Sources/BLCrashReporter.swift b/packages/swift-platform-sdk/Sources/BLCrashReporter.swift
index d1d24428..4151fb06 100644
--- a/packages/swift-platform-sdk/Sources/BLCrashReporter.swift
+++ b/packages/swift-platform-sdk/Sources/BLCrashReporter.swift
@@ -2,11 +2,12 @@
 // Generic MetricKit-based crash and performance reporting.
 // Stores crash diagnostics locally for debugging and feedback forms.
 // Product apps configure with a product-specific persistence key.
+// Not available on watchOS — MetricKit is iOS/macOS only.
 
 import Foundation
-import MetricKit
 
 /// Crash report model stored locally.
+/// Available on all platforms (data-only struct).
 public struct BLCrashReport: Codable, Identifiable, Sendable {
     public let id: String
     public let date: Date
@@ -25,8 +26,12 @@ public struct BLCrashReport: Codable, Identifiable, Sendable {
     }
 }
 
-/// Generic MetricKit crash reporter for all ByteLyst iOS apps.
+#if canImport(MetricKit)
+import MetricKit
+
+/// Generic MetricKit crash reporter for all ByteLyst iOS/macOS apps.
 /// Subscribes to MetricKit, stores crash reports in UserDefaults.
+/// Not available on watchOS (MetricKit is iOS 13+ / macOS 12+ only).
 @MainActor
 public final class BLCrashReporter: NSObject, ObservableObject, MXMetricManagerSubscriber {
 
@@ -127,3 +132,4 @@ public final class BLCrashReporter: NSObject, ObservableObject, MXMetricManagerS
         diagnosticCount = loadCrashReports().count
     }
 }
+#endif