Calculator - photo vault

Review by eFreeware

Most photo-hiding apps announce themselves. Calculator Photo Vault takes the opposite approach: the icon and the screen you see are a working calculator, and the files inside stay out of sight until you type a numeric PIN and press the equals button. That single decision shapes everything else about the app, and it is the reason it has collected more than 10 million installs and a 4.8 average from roughly 499,000 ratings.

This is a tool for people who share a phone and want a folder of pictures or clips that a partner, a roommate or a curious teenager will not stumble across. It is not a security product for journalists or anyone facing a determined attacker with technical skills; it is everyday camouflage for everyday situations. If that is the problem you have, the disguise is the most interesting part of the pitch.

The app is free to install, carries ads, and offers in-app purchases. It has been on Google Play since January 2019 and was still receiving updates in 2026, which suggests the developer has kept it alive rather than abandoning it after launch.

A calculator that opens into a vault

The core feature is the vault itself. The developer says content is protected with AES encryption, and the app places no stated restriction on file format or size, so the hidden area is not limited to images. You can also take pictures and record videos from inside the app, which saves you the step of moving a file across from the gallery afterward.

Unlocking is deliberately unremarkable. You enter your password on the calculator keypad and press the equals button, and the vault opens. Anyone glancing at the screen sees arithmetic; only someone who knows the sequence gets past it. I like that the entry point doubles as a genuine calculator with the usual arithmetic plus scientific functions, because a decoy that does not work would be noticed immediately.

A forgotten password is not a dead end. Typing 11223344 and pressing equals brings up your security question, and the correct answer retrieves the password. That recovery route is worth setting up properly the moment you install the app, since it is the difference between a locked vault and a lost one.

Getting a file back out is equally simple in principle: long press the encrypted item to enter edit mode, then use the restore button in the action bar. That is the path you would take before sending a photo to someone or moving it back to the regular gallery.

Private browsing and other extras

Beyond storage, the app bundles a private browser for opening sites you would rather not leave in your history. The developer says downloads from the web go straight into the vault. For anyone who saves images from the web, having that download land inside the hidden area rather than the gallery is a sensible piece of workflow design.

The intruder selfie is the feature I find most interesting. When someone enters the wrong password, the app automatically takes a photo of whoever is holding the phone. It will not stop a break-in, but it tells you it happened and who was there, which is more than most vault apps offer.

There is also a fake vault: a second, separate password opens a decoy area where you can keep photos and videos that are harmless if seen. The idea is that you can hand over the decoy password under pressure and keep the real content untouched. It is a clever layer, though it only works if the decoy looks convincing enough to be believed.

Smaller touches round things out. Shaking the phone closes the app quickly, fingerprint unlock is available as a faster alternative to typing the PIN, and a set of colorful themes lets you change the look of the calculator. None of these are essential, but each removes a little friction from daily use.

What the app asks of you

If you switch phones or reset the one you have, anything in the vault goes with it unless you back it up first.

The second requirement is memory. A forgotten password is recoverable through the security question, but only if you set one and can answer it. Treat that step as part of setup rather than an optional extra.

The app is free with ads and in-app purchases, and the feature set is broad enough to judge it on the free experience first.

Finally, the app expects a little discipline. The vault only helps if the files you care about actually end up inside it, and the decoy vault only helps if the two passwords stay distinct and memorable.

Getting the most from the disguise

Set the app up in one sitting. Choose your unlock password, set the security question, and decide on a fingerprint if you want quicker access. Doing this while you still remember every choice is far easier than reconstructing it later.

Keep the calculator looking used. The disguise works because the screen shows nothing unusual, and a calculator that has never been opened is no more suspicious than one that has. There is nothing to configure here beyond picking a theme color you actually like.

Think about what belongs in the decoy vault before you need it. A fake vault with nothing in it is not much of a decoy, so a handful of ordinary photos and videos makes the second password more believable if you ever have to use it.

Handle backups deliberately. Plan how you will move them before you change phones or reset the current one. Restoring an item to the gallery and copying it somewhere safe is a reasonable routine for anything you would hate to lose.

If you save images from the web, do it through the built-in browser rather than your usual one. That keeps downloads inside the vault from the start and avoids leaving a trail you would then have to clean up.

A familiar disguise for private files

Calculator Photo Vault solves a specific, common problem well: hiding photos and videos on a phone that other people also use.

The trade-offs are worth stating plainly. There are ads and there are in-app purchases, so backups are your responsibility. The disguise also depends on you remembering a PIN, a recovery answer and, if you use it, a second password for the fake vault.

I would suggest it to anyone who wants a low-friction way to keep a private set of photos and videos out of sight on a shared device and does not need cloud sync or a heavy-duty security tool. For that reader, the combination of a working calculator, AES encryption and a decoy vault is a practical package at no cost to try.

What's new in version 11.1.0

- Fix some bugs, improve stability