Encrypted note files
Each note lives in its own encrypted file, protected with AES-256-GCM and a master password-derived key.
Secure Notes, reintroduced for modern macOS
Quiet, encrypted notes that stay out of your way.
Arca is a focused replacement for the old Keychain Access Secure Notes workflow. One note per encrypted file, iCloud-friendly storage, and a native macOS utility feel.
Requires macOS. Distributed as a notarization-ready DMG.
Encrypted on disk
AES-256-GCM
Storage model
1 note = 1 file
Sync behavior
iCloud-friendly
Unlock flow
Password + biometrics
Built for familiar habits
A calm utility, not a noisy notebook app.
If you kept sensitive snippets in Secure Notes because it was fast, private, and low-friction, Arca is designed for that exact workflow. Unlock, search, edit, lock, and move on.
- Native macOS interface with a Keychain-like three-pane layout
- Master password protection with optional biometric local unlock
- Single-window utility behavior without extra workspace clutter
Why Arca
Private by design. Durable by default.
Arca keeps the storage model simple so your notes remain inspectable, syncable, and resilient under real-world file conflicts.
Safer sync behavior
Conflicts are preserved instead of silently merged away, and broken files are skipped without taking the whole vault down.
Ready for iCloud Drive
Arca stores notes in an iCloud Drive-backed vault when available and falls back to local storage when it is not.
Focused on quick access
Search, edit, save intentionally, and lock again. No extra system for tags, collaboration, or rich text noise.
Download
Install Arca with a single DMG.
This GitHub Pages site serves the downloadable DMG directly, so you can link the product page and the installer from the same place.