iOS vs Android Comparison

Two Native Implementations Compared

Horologe shares the same relational database schema (schema v11), the same relative image storage rules, the identical ZIP backup archive layout, and uniform timing math across iOS and Android. However, each build utilizes the optimal native paradigms of its platform.

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Comparison Matrix

Feature	Horologe for iOS	Horologe for Android
Language & UI	Swift 6, SwiftUI + @Observable	Kotlin 2.4, Jetpack Compose
Design System	Apple HIG, adaptive layout on iPhone & iPad	Material 3 (Black & Gold #FFE600 brand palette, Material You)
Database Library	GRDB.swift on SQLite (schema v11)	Native direct SQLite (WatchDatabase.kt, schema v11)
Photos & Attachments	Documents/watch_images/ with fallback logic	Relative paths in app_flutter/watch_images/
Cloud Sync	Apple CloudKit (multi-record, SHA-256 deduplication)	None (strictly offline-first)
App Lock	Biometric unlock via Face ID / Touch ID	Biometric unlock via Android BiometricPrompt
PDF Sheet Export	Native Core Graphics / SwiftUI rendering	Native Android PdfDocument with system typography
Service Alarms	Local notifications via UserNotifications	AlarmManager with MY_PACKAGE_REPLACED boot receiver
Backup Format	Compressed ZIP (manifest.json v3 + photos folder)	Compressed ZIP (manifest.json v3 + photos folder)

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Platform-Specific Details

Horologe for iOS

• Smart CloudKit Sync:
  • The primary-v2 record syncs the lightweight JSON manifest (watches, services, wrist time, accuracy).
  • Images upload independently as file-<sha256> records. If an image is already backed up, it is not re-uploaded (content-addressable storage).
  • Anti-Throttling (HTTP 429): large collections with hundreds of high-res photos pass through withServerRetry, honoring CKErrorRetryAfterKey to prevent server rate limits.
• iPad Experience: large-screen navigation featuring adaptive sidebar controls (.sidebarAdaptable) and multi-column grid views.

Horologe for Android

• Brand Palette & Material You:
  • Signature dark theme with pure blacks and gold/yellow #FFE600.
  • Custom Style: dynamic extraction from wallpaper (Android 12+) or 8 harmonized presets calculated via material-color-utilities.
• Zero Internet Permissions: the Android app requests zero network access: all photos and databases remain completely sandboxed on-device.
• Alarm Resilience: service reminders survive app updates via the MY_PACKAGE_REPLACED broadcast receiver.

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Interchangeable ZIP Backups

The .zip archive exported by Horologe contains:

1. manifest.json: version 3 JSON database dump.
2. watch_images/: high-resolution watch photos named systematically (watch_1_cover.jpg, etc.).

You can export your watch collection from an iPhone and restore it instantly on an Android device, or vice versa, with zero data loss.