Secure Vault: Private Notes

Secure Vault keeps sensitive notes behind a PIN or your fingerprint/face unlock, with real on-device encryption backed by the Android Keystore. Store passwords, private thoughts, or anything else you'd rather keep locked away. Nothing leaves your device.

Set a 4-8 digit PIN the first time you open the app, then unlock with that PIN or biometrics on every return. Notes are AES-256-GCM encrypted before they ever touch storage, using a key that lives inside the Android Keystore and never leaves it. The vault re-locks automatically whenever you leave the app, and vault content is excluded from the recent-apps screenshot and from screen recordings.

Add, edit, and delete notes freely - each note is encrypted independently, so only unlocked content is ever decrypted in memory. Switch between light, dark, or system theme, and use the app in English, Simplified Chinese, or Traditional Chinese.