Notesnook

Notesnook is a fully open-source note-taking application that prioritizes user privacy through complete end-to-end encryption using XChaCha20-Poly1305 and Argon2. All notes notebooks tags and attachments are encrypted on the device before syncing. Features include rich text editing markdown support real-time sync across devices notebook organization password-protected vaults offline access and the ability to self-host the sync server.