Mind Locker keeps your private photos, videos and documents in encrypted
vaults on your own phone. It has no internet permission at all, so nothing
you put in it can leave the device.

OPENS TO A KEYPAD
The app opens to a numeric keypad. Each vault, and the settings screen, has
its own number and its own password. Nothing is shown before you sign in — no
vault names, no file counts, no thumbnails.

EVERY VAULT IS SEPARATE
Each vault has its own independent encryption keys. Opening one vault gives
no access to another, and the settings screen cannot open or delete any vault
— that restriction is built into the code, not just the interface.

REAL ENCRYPTION
Files are encrypted with XChaCha20-Poly1305 and each file gets its own key.
Passwords are put through Argon2id, the current standard for password
hashing. File names, folders, sizes and thumbnails are encrypted too, not
just the file contents.

IMPORT FROM YOUR GALLERY
Pick photos and videos from an in-app gallery, or any file through the system
file picker. Choose Copy, which leaves the original alone, or Move, where the
phone's own delete dialog asks you before any original is removed. Every file
is verified inside the vault before an original is ever touched.

VIEW WITHOUT UNPACKING
Open images, videos, audio, PDFs and text straight from the vault. Arrange
files as a list, a grid or large icons, and swipe left and right to move
between them.

OPTIONAL FINGERPRINT OR FACE UNLOCK
Turn it on per vault, using that vault's password. Your fingerprint or face
never reaches the app: the phone's secure hardware releases a key only when
it recognises you. Your password always keeps working, and adding a new
fingerprint to the phone switches the shortcut off automatically.

PROTECTION AGAINST GUESSING
Wrong numbers and wrong passwords are limited. After a few failures the app
locks for 15 minutes, then 1 hour, 6 hours, up to 24 hours, and the lockout
survives a restart and a changed clock. Wrong attempts NEVER delete your
files.

ENCRYPTED BACKUP
Export a backup protected by its own passphrase, so you can restore after
losing or replacing a phone. Recovery keys are shown once, for you to write
down.

NO ADS, NO TRACKING, NO ACCOUNT
No advertising, no analytics, no crash reporting, no sign-up. The app has no
servers and never talks to any.

WHAT WE DO NOT CLAIM
Mind Locker is a normal, visible app — it does not hide itself and does not
pretend to be a calculator or a phone dialler. It cannot protect data on a
rooted or malware-infected phone, and it cannot guarantee that an original
you moved is gone from your cloud photo service or an old backup; it tells
you so when you move a file. If you lose both a password and its recovery
key, that vault cannot be opened by anyone, including us. That is the point.