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

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