2026
Color Notes
Mobile app · Published on Google Play
An offline-first notes app built with Flutter for Android and iOS. Notes back up automatically to the user's own Google Drive, OneDrive or Dropbox, so their data never sits on a server I run.
- Cloud backup through each provider's REST API with OAuth 2.0 PKCE sign-in.
- A delta sync engine (manifest index, timestamp-based conflict resolution that keeps both versions, token refresh and backoff) that runs on save and every 15 minutes in the background.
- Freemium subscriptions with RevenueCat (7-day trial, custom paywall), Google Keep import and share-to-app support.
- Covered by unit, widget and integration tests.
- Flutter
- Dart
- Riverpod
- Isar
- OAuth 2.0 PKCE
- RevenueCat