CalculatorLKR hides a military-grade file vault behind a perfectly functional calculator. No one will ever know what's on your phone.
Built for people who value privacy. Designed to be invisible. Engineered to be unbreakable.
Opens to a fully working calculator. No vault branding, no suspicious icons. It just looks like a calculator app — because it is.
Files are encrypted directly into the app's private storage. Unreadable outside the app — even if someone copies your device.
Use fingerprint or face unlock on supported devices. Your files open as fast as your calculator — and just as naturally.
Automatically locks when the app moves to background. Optional idle timeout ensures the vault is never left open by accident.
Uses Android's Storage Access Framework for safe file picking and exporting. Zero file access without your explicit approval.
Forgot your PIN? Long-press C on the calculator screen to trigger a secure recovery flow via your secret question.
Install and open the app. You see a normal, functional calculator. Nothing suspicious — tap some numbers, it all works.
Type your secret PIN as if entering a calculation (e.g. 1234), then press =. The vault unlocks silently.
Choose "Lock Files" from the hidden menu. Pick files via the Android picker. They get encrypted into secure private storage.
Open the vault, pick the file to restore, and export it to any folder you choose using SAF — safe and private.
Long-press C on the calculator screen to access the PIN recovery screen. Answer your security question to reset.
Encrypted files live in the app's private directory — inaccessible to other apps and invisible to file browsers, even without root.
The app icon, launcher name, and UI are purely calculator-themed. No telltale signs for anyone scrolling through your phone.
Uses Android's official SAF — no broad storage permissions needed. Files are picked and exported only when you choose, each time.
Walk away and the vault locks itself. Configurable idle timeout ensures no one can access your files if you leave your phone unattended.
Free. No ads. No tracking. Just a calculator — and your privacy.