Calculator vault apps: how they work and how to spot one
A working calculator on the outside, a photo vault behind a code.
A calculator vault looks and works like a normal calculator, but typing a code and pressing equals opens a hidden photo vault. They're good at not looking like a vault. The catch is that many are free apps paid for by ads, with broad permissions and cloud features, so check who makes one before trusting it with private photos.
How they work
The app opens to a calculator that really calculates. Type your code, press =, and the calculator gives way to a vault where you can move photos, videos and sometimes notes or contacts. Many add extras: a second code that opens a fake vault, a photo of anyone who gets the code wrong, or an option to close the vault when you turn the phone face down.
The appeal is obvious. Someone scrolling through your apps sees a calculator and moves on.
What most reviews skip
Who pays for it. Most calculator vaults on the Play Store are free and carry ads, and ads usually come with tracking. Check the Data safety section on the app's Play Store listing to see what it collects and shares.
Permissions. Some ask for access to all your files, your camera, your contacts and the internet. A vault needs some of that, but not all of it.
How you get back in. If you forget the code, most of these apps let you recover it by email or a security question. That's useful, and it also means your email is a way into your vault.
The disguise is well known. Local news stations have run segments showing parents what these apps look like. A calculator isn't the secret it was.
How to tell if a calculator is a vault
- There are two calculator apps on the phone.
- The calculator's Play Store listing talks about hiding, locking or vaults. Open it from Settings, then Apps, to see which app it really is.
- The calculator is using a lot of storage. A real calculator takes up a few megabytes, not gigabytes.
Calculator vault or a vault with a pattern?
Dobr doesn't pretend to be a calculator. It's a vault and looks like one. What it does instead is keep what's inside unreadable: files are encrypted with AES-256, the key comes from your pattern and the phone's secure hardware, and the app has no internet permission at all. With Unlimited, a second pattern opens a second vault, and nothing in the app says how many exist. Our Dobr vs calculator vault apps page sets the two side by side.
Last checked 2026-11-04. Phone menus change between Android versions and brands, so labels on your phone may differ slightly.