The goal of the Crypto Notes app is to create the most secure note-taking application. Without the password, no one can access or modify your notes. We use an encryption method that is very close to information-theoretic security, providing a level of security equivalent to it in most typical scenarios.
The password is the only way to access your notes. If you forget it, the content of your notes will be permanently lost. Therefore, please make sure to remember your password carefully and avoid setting one that is too simple, to prevent others from guessing it through brute force attacks.
Notes are encrypted and stored locally, not on the server. You can back them up via iCloud. Future versions of the app will support synced access across iOS and macOS devices via iCloud.