No internet permission.
Vault Diary doesn’t request permission to use the internet, so it has no way to send your notes anywhere. You can see the app’s permissions on its Google Play page.
Offline · Encrypted
Your notes never leave your phone.
Vault Diary is a private place for your notes and to-dos — locked with your PIN or fingerprint, encrypted on your device, and built without internet access.
One-time purchase · No ads · No account · No subscription
The promise
Privacy you can check, not just trust.
Locked and encrypted.
Everything you write — notes, checklists, photos and tasks — is encrypted on your phone and unlocked only with your PIN or fingerprint.
No accounts. No tracking.
No sign-up, no ads, no analytics, no crash reports. Nothing about you or your notes is collected.
Features
Everything you need. Nothing you don’t.
Notes the way you like them.
Write notes or checklists, add photos, pick from twelve colours, pin what matters and organise with labels. Search finds anything in an instant.
A to-do list that stays out of the way.
Type a task, press enter, done. Tick it off and it moves to Completed. That’s it.
Opens only for you.
A 6-digit PIN or your fingerprint unlocks the app. It locks itself when you leave, blocks screenshots and hides its preview in recent apps.
Backups you control.
Export an encrypted backup file and keep it wherever you like — a USB drive, your computer, anywhere. Restore it on a new phone with your backup password.
Gallery
Beautiful, day or night.
A calm dark design by default, with an equally polished light theme.
Notes 
Photos in notes 
Search 
Tasks 
Lock screen 
Encrypted backup
Notes 
Checklists 
Tasks 
Lock screen
Security
How your data is protected.
Encrypted storage
Your notes, images, labels and tasks are stored encrypted on your phone. The key is protected by your PIN and your phone’s secure key storage.
Locks automatically
Choose when Vault Diary locks: immediately, or after 30 seconds, 1 minute or 5 minutes in the background.
Guesses are slowed down
After too many wrong PINs, the app makes you wait before trying again.
Fingerprint stays on your phone
Fingerprint unlock uses Android’s own secure system. If a new fingerprint is added to your phone, Vault Diary turns fingerprint unlock off until you enter your PIN.
Encrypted backups
Backup files are encrypted with a separate password that you choose. Without it, the file can’t be opened.
Not in cloud backups
Vault Diary’s data is excluded from Android’s automatic cloud backups.
There is no “forgot PIN”.
Vault Diary has no accounts and no servers, so nobody — including us — can recover a forgotten PIN. Keep an encrypted backup and remember its password.
Pricing
Pay once. Own it.
Vault Diary[Price coming soon]One-time purchase
- Notes, checklists, photos and tasks
- PIN & fingerprint lock
- Encrypted backups
- No ads, no subscription, no account
FAQ
Questions, answered.
Does Vault Diary ever connect to the internet?
No. The app doesn’t request the internet permission, so it can’t connect. Your notes stay on your phone unless you export a backup file yourself.
What happens if I forget my PIN?
Your data can’t be recovered — there’s no account or server that could reset it. If you have an encrypted backup and remember its password, you can reinstall the app and restore it.
How do backups work?
In Settings, choose Export backup, create a backup password and pick where to save the file. To restore, choose Restore from backup on a new install (or Import backup in Settings) and enter that password.
Can I move my notes to a new phone?
Yes — export a backup on your old phone, copy the file to the new one, and restore it during setup.
Is there an iPhone or desktop version?
Not at the moment. Vault Diary is available for Android.
Why is it a paid app?
Because it has no ads, no tracking and no data to sell. A one-time price keeps it that way.
Does it work without fingerprint?
Yes. Fingerprint is optional; your 6-digit PIN always works.
Which Android versions are supported?
Android 8.0 and newer.