Notesnook is a note-taking app for individuals and teams who want their notes kept encrypted. According to the vendor, notes are encrypted on the device before they sync, so the servers only hold data that is unreadable without the user's key. The app offers tables, checklists, Markdown, linked notes, attachments, reminders and a web clipper, plus a vault protected by a second password. Notesnook runs on Windows, macOS, Linux, Android, iOS and in the browser.
Notesnook is operated by Streetwriters (Private) Ltd, whose terms are governed by the laws of Pakistan. The privacy policy states that data is stored on servers in Germany. The clients and the sync server are open source under GPLv3, so the code can be inspected. A self-hosted sync server appears on the public roadmap but is not yet confirmed as available. For a European organisation this means storage inside the EU, combined with a vendor based outside the EU.