Vault Note is a small local notebook for information you want encrypted at rest. Notes use AES-256-GCM, while the encryption key is generated and protected by Android Keystore. App backup is disabled so ciphertext is not copied through ordinary Android backup.
Create, edit and delete notes without an account, sync service or developer server. Note content is never supplied to AdMob. Long-press a saved note to delete it. Smart Assist is deliberately separated behind Android Share, so note text leaves the app only if you choose another destination.
Security boundary: this version does not add a separate biometric lock. Anyone who can unlock the phone may be able to open the app. Uninstalling the app normally removes both its local notes and Keystore key, making recovery impossible.
Encrypted local notes protected by Android Keystore with no account