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NoteSR vs Notesnook: catalog facts
NoteSR	Notesnook
Free Free and open source under the MIT licence.	Freemium A free tier covers unlimited notes and sync across devices. A paid Pro subscription adds…
Android	Windows, macOS, Linux, Android, Web
AES-256 encryption for notes and attachments Fully offline with no account or tracking	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
No sync between devices Android only	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	Downloadable app, Web application
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	Account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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