Is a calculator vault app safe? What the disguise protects, and what it does not

Updated November 1, 2026Written for iOS 17 to iOS 26; menu labels checked on iOS 26By Mirage Vault team

A calculator vault app is as safe as its encryption, not its disguise. The working-calculator front keeps the vault out of sight at a glance and from someone scrolling your Home Screen, but the photos behind it are only protected if the app encrypts them on the device with a named cipher and a key that cannot be copied. Check the encryption first; treat the calculator as a bonus.

What a calculator vault app actually is

A calculator vault app is a photo vault whose Home Screen icon and first screen look like a calculator. The calculator usually works; typing a secret code (often a number followed by the equals sign or a percent sign) opens the hidden photos. The idea is that someone picking up your iPhone sees a calculator, uses it, and never finds the vault.

That is a disguise, and disguises have one job: surviving a glance. Whether the photos behind the calculator are safe is a separate question, answered by the same checks as for any vault app. Some calculator vault apps encrypt properly and say so; one well-known app states AES-256 with PBKDF2 at 200,000 iterations on its website (read 2026-10-31). Others say nothing about encryption at all, and a calculator in front of plain files is a calculator in front of plain files.

What the calculator disguise protects

  • A glance at the Home Screen. A calculator sitting among other utilities does not invite a second look.
  • A quick scroll by a curious person. Opening the app shows a calculator that calculates.
  • A child or a colleague. People who do not know calculator vaults exist will not look further.

What it does not protect

  • Anyone who knows the pattern. “Secret calculator app” is a common search; the category is well known, and iOS already has a Calculator, so a second one is a flag rather than camouflage.
  • The label. iOS does not let an app change the name under its icon. A calculator-style icon labelled with the vault’s real name is the opposite of hidden; App Library search lists it too.
  • A copy of the files. Backups, forensic tools and a synced Mac see the app’s folder, not its icon. Only encryption matters there.
  • An unlocked vault. Once the code is typed, the front is gone.
  • Someone forcing you. A disguise does nothing after “open it”. A decoy vault or a duress code does.

What to check in a calculator vault app

The same seven checks as for any vault, in the order that matters for this type:

  1. Is the cipher named with its parameters? AES-256 with a key derivation function and a round count is a real statement; “secure” and “private” are not.
  2. Where does the key live? If the key is derived from the calculator code alone, a four-digit code can be guessed offline from a copy of the files in seconds. A key wrapped by the Secure Enclave cannot be guessed off the device.
  3. Is there a break-in photo, and where does it go? Several calculator vaults take a photo on a wrong code. Check whether it stays on the device and whether it includes a location.
  4. Does the app carry ads? Free calculator vaults often do. An ad SDK inside a vault app sees that you use one.
  5. What happens when you forget the code? A recovery by e-mail means the company can open the vault.
  6. Is there a decoy? A second code that opens a second set of photos is more useful under pressure than a calculator.
  7. Does the vendor publish anything checkable? A technical page with real parameters, or open code.

How Mirage hides without pretending

Mirage Vault takes a different route to the same goal of not being noticed. Instead of imitating another app, it removes the things that give a vault away:

  • The lock screen is blank. No app name, no logo, no grid. The pattern grid appears under your finger when you start drawing and fades when you lift it.
  • The icon can be changed to one that does not say “vault” (Mirage Pro). The label under it stays “Mirage”, because iOS keeps the real name under any icon; the app says so on the Disguise screen and shows the Shortcuts route for any name you like.
  • The app switcher shows a blank snapshot, and the vault locks on leaving.
  • Behind the disguise, the encryption is real: AES-256-GCM per 1 MiB chunk, a key per file, the vault key wrapped by ECIES on a P-256 key in the Secure Enclave, no account, no analytics. A decoy vault behind a second pattern and a Wipe Key cover the “open it” case that no disguise covers.
The Disguise screen in Mirage Vault settings listing the real icon and alternative icons, with the note that iOS shows a confirmation when the icon changesThe Disguise screen in Mirage Vault settings listing the real icon and alternative icons, with the note that iOS shows a confirmation when the icon changes
The Disguise screen says what iOS allows: the icon changes, the label does not.

Calculator vault or a blank vault?

Calculator vault app Mirage Vault
Survives a glance at the Home Screen Yes, unless the label gives it away Yes, with an alternative icon (Pro); label stays “Mirage”
Survives someone opening the app Yes, if they do not know the pattern Yes: a blank screen with nothing to tap
Known trick Yes, widely No imitation to recognise
Encryption Depends on the app; check AES-256-GCM, Secure Enclave, stated on the security page
Under pressure Usually nothing Decoy vault, Wipe Key (Pro)

The comparison pages list what specific apps state, with the date each listing was read.

Questions

Can people tell a calculator vault app from the real Calculator?
Often, yes. iOS comes with a Calculator, so a second one is a known pattern; lists of "secret calculator apps" are easy to find. The label under the icon usually gives it away too, and App Library search lists both.
Does Mirage Vault look like a calculator?
No, by design. Mirage changes the icon to one that does not say vault, keeps the lock screen blank with no app name, and shows a blank app switcher snapshot. It does not pretend to be another app, because a working calculator front is the first thing people check and iOS keeps the real app name under any icon.
Does the calculator front protect against a copy of my files?
No. The front is a screen. A copy of the app folder or an iPhone backup contains whatever the app stores, encrypted or not, regardless of the calculator.
Are calculator vault apps allowed on the App Store?
Yes, they are listed in Utilities and Photo & Video. App Store review does not assess encryption quality, so the presence of an app on the store says nothing about how it protects photos.