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kardi notesNotesnook
Free

Free and open source under the GPL 3.0.

 Freemium

A free tier covers unlimited notes and sync across devices. A paid Pro subscription adds…

Windows, macOS, Linux, Android, iOS, Web Windows, macOS, Linux, Android, Web
  • Encrypted notes readable only by you
  • Clients for desktop, mobile and the web
  • End-to-end encrypted on device with XChaCha20-Poly1305 and Argon2, so the service holds no readable data
  • The full client codebase is published, which makes the privacy claim auditable
  • Lost password or device means lost data
  • Built and maintained by a single developer
  • An account is required; it is a sync service, not a local-only app
  • Encryption means no server-side search, and losing your password loses the notes
Downloadable app, Web application Downloadable app, Web application
Open source Open source
License: GPL-3.0 License: GPL-3.0
Not stated if an account is needed Account needed
Not stated if it works offline Works offline

Checked October 2, 2026

Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.