Open Source Swift Note-Taking Apps

FSNotes is a modern notes manager for macOS and iOS. App respects open formats like GitHub Flavored Markdown, so you can easily write documents on iPhone and MacBook. It's simple and blazing fast! Sync via iCloud Drive. 3D Touch and configurable keyboard. TextBundle and EncryptedTextBundle containers. Pinned notes are kept in sync with the desktop app. Dynamic fonts (iOS 11+). Night mode by location or screen brightness. Sharing extension. Encrypted note support.

Simplenote for macOS is the official native macOS application for the Simplenote service, giving Apple computer users a dedicated environment to write, organize, and sync notes with the same simplicity found on other platforms. Built using macOS frameworks and powered by the Simperium synchronization protocol, it ensures that any text or Markdown notes you create are automatically backed up and kept in sync with Android, iOS, web, and other clients. The app supports fast searching and tagging so users can keep large collections of notes orderly, and has features like history or revision views to recover previous edits. macOS integration means users benefit from keyboard shortcuts, native window management, and system services like Spotlight search to find notes instantly. As a GPL-licensed open-source project, it invites contributions and learning, letting developers tweak UI or add platform-specific enhancements without being locked into a proprietary ecosystem.

Simplenote for iOS is the official iPhone and iPad client for the cross-platform Simplenote note-taking ecosystem, providing iOS users with a clean, responsive interface to create, edit, and manage plain-text notes. It syncs seamlessly with Simplenote’s cloud infrastructure so that notes created on a phone instantly appear on web, Android, macOS, or desktop apps without manual steps. On iOS, users can search quickly across all notes, organize content with tags, and use native iOS behaviors such as swipe gestures, system share sheets, and keyboard shortcuts for efficient workflow. With Markdown support, notes can include basic formatting and previewing, letting writers structure content easily without clutter. The repository includes setup guidance for building and running the app with proper credentials for the syncing service, showing that the codebase gives contributors a practical foundation for experimenting or extending capabilities.