Designed for Calm, Privacy & Inspiration
Secret Diary blends robust zero-knowledge cryptography with intuitive Material 3 design to make private journaling a joyous daily habit.
Client-Side AES-256-GCM Zero-Knowledge Encryption
Every time you write or update a note, your device generates a fresh 12-byte Initialization Vector (IV) and encrypts your title, body, checklists, and mood tags with an AES-256 Master Key.
- ✔ No Plaintext Exposure: The cloud database only stores ciphertext.
- ✔ Argon2id Key Wrapping: Protected against GPU brute-force attacks.
- ✔ 128-bit Authentication Tag: Prevents unauthorized tampering or payload corruption.
Biometric Touch, Face Unlock & 6-Digit Vault PIN
Control your sanctuary at whatever level of friction you choose. Enable native Android BiometricPrompt for instantaneous fingerprint or face unlock, or set a dedicated 6-digit Vault PIN.
- ✔ Note-Level Lock: Lock individual extra-sensitive notes behind a separate PIN.
- ✔ Auto-Lock on Background: Vault locks immediately when you switch apps.
- ✔ Hardware Keystore Support: Keys reside safely in secure hardware elements.
Rich Checklists, Mood Badges & Spaces
Organize thoughts across customizable life categories: Personal, Work, Ideas, or Private. Embed interactive to-do checkboxes directly within your stream of consciousness.
- ✔ Actionable Journaling: Check off tasks and daily habits as you reflect.
- ✔ Custom Icon & Palette Badges: Personalize each entry with vibrant colors.
- ✔ Pinned Favorites: Keep top goals and principles pinned to the home screen.
Instant Google Drive Backups & Device Migration
Switching phones or recovering from a lost device shouldn't mean losing your life story. Secret Diary provides seamless zero-knowledge cloud snapshots and Google Drive integration.
- ✔ Automatic Instant Sync: Every entry is securely backed up in real time.
- ✔ Direct Google Drive Sync: Store your snapshots in your own Google Drive.
- ✔ One-Tap Restore: Recover entire diary history on a new Android phone in seconds.
Accidental Delete Protection & Trash Recovery
Never fear accidentally deleting an important memory. Deleted notes are safely moved to your encrypted Trash bin, where they can be restored at any time or wiped permanently with zero forensic residue.
- ✔ One-click instant note restoration.
- ✔ Permanent cryptographic wipe capability.
Ready to Experience True Private Journaling?
Download Secret Diary on Google Play today and protect your thoughts with military-grade zero-knowledge encryption.