Calculator vault apps: what the disguise does and doesn't do

Calculators are the most popular costume for vault apps. The idea is simple: to anyone borrowing your phone, it is a calculator. Type the right numbers and the vault opens. Before you pick one, it helps to separate two questions that the costume blurs together.

Two questions, not one

1. Is the app hard to notice? That is what the disguise is for.
2. Are my files protected if someone finds them anyway? That is what encryption is for.

A calculator vault answers the first question. It says nothing about the second. An app can have a perfect calculator face and keep your photos as ordinary files in a folder.

What the disguise does well

• It stops a glance. A friend scrolling past your icons sees a calculator.
• It avoids awkward questions from people who see the app name.
• It can make a quick handover of your phone less stressful.

Where the disguise falls short

• Anyone who knows to look. Search, the app list and storage settings all show installed apps, whatever their icon says.
• Android is more open. The platform’s own private space help page says that in some cases you can’t hide a private space from people who install apps on your phone or connect it to a computer. Ordinary disguised apps have the same exposure.
• Hiding an icon isn’t deleting or locking. On iPhone, removing an icon from the Home Screen moves the app to the App Library, where it can still be used.
• Store and payment records. A purchase or download history can reveal the app even if the icon doesn’t.
• A strange calculator. One that asks for photo access or a subscription is easy to question.

What matters more than the icon

Because the disguise is the weakest part of the protection, spend your attention on the rest:

• Does it encrypt? Look for a named cipher and a description of how keys are made. See how photo vault apps work.
• Can you get your files out? Look for a full-quality export.
• What happens when you uninstall? Most apps lose their data with the app.
• What happens if you forget the code? If support can reset it, they can open your files.
• Does it need an account? Fewer accounts, fewer places for your data to live.

Are photo vault apps safe turns these into a checklist you can run in ten minutes.

A decoy is only as good as the separation

Some disguised apps offer a second code that opens a fake vault. That helps only if the real vault is kept apart and encrypted. If both codes open views of the same files, a person who can read those files sees everything. Ask the maker how the two are separated.

Think about the real threat

If you are keeping photos from a nosy friend, a plain vault with a strong PIN is enough, and no one needs to be fooled. If someone close to you knows your screen lock, or might go through your apps, you may want an app that looks unremarkable plus real encryption. If your safety depends on no one finding the app, the phone’s own settings and your situation matter more than any single app. In that case, built-in tools are covered in hide photos on Android and hide photos on iPhone.

Silo is a plain encrypted vault, coming soon to iPhone and Android. It puts its effort into the encryption and the file format rather than a costume, and a second vault opened by a different PIN is arriving with launch.