Notesnook is a free and open-source note-taking app focused on user privacy and ease of use, available on Windows, macOS, Linux, Android, iOS and the web. It is developed, supported and funded by Streetwriters (Private) Limited. According to its about page, Notesnook began in 2019, and its first version, released in April 2021, included the subscription-based Pro plan.
Notesnook encrypts everything on the user's device with XChaCha20-Poly1305 and Argon2 to uphold zero-knowledge principles, and its site says notes are encrypted before they leave the device. Its repository describes it as an 📝end-to-end encrypted note-taking alternative to 📝Evernote, and its site invites users to bring notes across from Evernote, Google Keep or 📝Obsidian. The editor lists 📝Markdown support among its features. Notesnook states that every one of its apps, and the server notes travel through, is open source, and the repository's licence file is the GNU General Public License, version 3. As of November 2026, its pricing page lists Free, Essential, Pro and Believer plans, with Essential at $1.99, Pro at $6.99 and Believer at $8.99 per month on monthly billing, including tax, and lower monthly rates on annual billing; the Free plan is marked free forever, with no card required.