Cheating apps: the five kinds, what each hides and what still shows
·Written by the developer of Stash
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Cheating apps are not a special category in the App Store. The apps cheaters use are ordinary privacy apps of five kinds: photo and file vaults, vault apps disguised as a calculator or another tool, messengers with locked or disappearing chats, second-number apps, and private browsers. Each one hides a single layer of the phone. None hides everything: the app icon, its size in Settings > General > iPhone Storage and the App Store purchase history stay visible. For the vault layer, our pick (we build it) is Stash: Calculator Photo Vault: a working calculator with an AES-256 encrypted vault and a decoy PIN (Premium).
So the useful question is not "which secret cheating app exists", but what each kind of app keeps private and what it leaves behind. This page sorts the hidden apps cheaters use into those five kinds, ranks the vault apps on facts from their vendors' own pages, and links every guide in this section, for people protecting their privacy and for people who suspect a partner.
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The five kinds of apps cheaters use
| Kind of app | Examples | What it hides | What still shows |
|---|---|---|---|
| Photo and file vault | Stash, Keepsafe, Private Photo Vault | Photos, videos and files imported into the app, behind a PIN separate from the iPhone passcode | The icon, its size in iPhone Storage, purchase history, originals left in Photos until deleted |
| Disguised vault | Stash, Calculator#, LockMyPix (calculator mode) | The same, with a first screen that looks like a calculator or another tool | Two calculator icons, a "calculator" that uses a lot of storage, its use time in Screen Time |
| Locked or disappearing chats | Messengers with chat lock, archived chats or disappearing messages | A conversation from the main chat list, or after a set time | The messenger itself, notification previews if they are on, linked devices |
| Second number | Second-number apps, a second line on an eSIM | Calls and texts on a number other than the main one | The app, or a second line listed under Settings > Cellular |
| Private browser | Safari Private Browsing, other private browsers | Browsing history on the device | The browser, downloaded files, accounts signed in elsewhere |
Vaults are where most searches for cheating apps end up, because photos are the most common thing people want out of the camera roll. A vault keeps its files in its own storage, outside the Photos library, so iCloud Photos does not upload them. More on what each vault hides: apps cheating wives use.
Disguised vaults add a harmless first screen. The best known is the calculator vault: it calculates normally, and a PIN followed by = opens the vault. How they work and how they get noticed: calculator vault apps.
Locked or disappearing chats live inside messengers. They change what shows in the chat list, not what the other person keeps on their phone. Apple's own Messages app has no hidden folder; the native options are in how to hide text messages on iPhone.
Second numbers separate calls and texts. An iPhone with eSIM can hold more than one line, and every line is listed in Settings.
Private browsers stop the history from being saved on the phone. Safari's Private Browsing tabs can be locked with Face ID in recent iOS versions. They do nothing for downloads, screenshots or the sites themselves.
Ranked: the vault apps people use most
| Best for | App | Own PIN, separate from the iPhone passcode | Decoy PIN | Break-in photo or log | Calculator look |
|---|---|---|---|---|---|
| Our pick | Stash: Calculator Photo Vault | Yes | Yes (guest PIN, Premium) | Yes (opt-in Intruder Log with photo, Premium) | Yes |
| Break-in photo with GPS | Private Photo Vault | Yes (PIN or pattern) | Yes (decoy password) | Yes, photo and GPS | Not stated |
| iPhone and Android | Keepsafe | Yes (PIN) | Not stated | Tracks break-in attempts (Premium); photo not stated | Separate Android-only app |
| Decoy vault plus calculator mode | LockMyPix | Yes (own code) | Yes (fake vault) | Yes (intruder selfie) | Yes (calculator mode) |
| Many backup destinations | Calculator# | Yes (password) | Not shown | Logs invalid attempts ("Hack Monitor") | Yes |
| Built in, nothing to install | Apple Hidden album | No (iPhone passcode, Face ID or Touch ID) | No | No | No |
Sources: each vendor's own website or App Store listing, read on 8 October 2026 and re-checked on 10 October 2026; links and details are in best photo vault apps for iPhone. "Not stated" or "not shown" means the vendor's pages do not say; it does not mean the feature is missing.
Competitor details last checked: 2026-10-10, from each vendor's own pages.
Our verdict: we build Stash, and it is our pick of these apps, because it combines a PIN separate from the iPhone passcode, a guest PIN, an intruder photo and a calculator disguise, and encrypts files on the device with AES-256. Choose Keepsafe or Private Photo Vault if you also need Android. The Hidden album is enough for a few photos if nobody else knows your passcode.
What none of these apps hides
Every app above is still an installed app. Whoever can unlock the phone can usually see:
- every app and its size in Settings > General > iPhone Storage;
- daily use per app in Settings > Screen Time > See All App & Website Activity;
- purchases in Settings > [your name] > Media & Purchases > View Account > Purchase History;
- notification previews on the Lock Screen, unless Settings > Notifications > Show Previews is set to When Unlocked or Never;
- anything that syncs to a shared iPad or Mac through the same Apple Account.
In iOS 18, third-party apps can be hidden in a Hidden folder at the bottom of App Library. The folder itself stays visible. Where to look: how to find hidden apps on iPhone.
If you suspect a partner
An app from this list is not proof of anything. Vaults and private browsers are on many phones for ordinary reasons: documents, health records, gifts, photos someone simply does not want in the camera roll.
Going through another adult's phone without permission, or installing monitoring software on it, can be illegal in many countries, and this site does not recommend any tool for that. What you can do legally, and how to talk about it, is in how to catch a cheater on iPhone. If you think someone has access to your own phone, run Safety Check (Settings > Privacy & Security > Safety Check, iOS 16 and later).
How Stash fits
Stash: Calculator Photo Vault is a disguised vault. It opens as a working calculator, and typing your PIN and = opens the vault. It can also take the look of a step tracker or a puzzle game, with a matching icon. Photos, videos, PDFs, documents and audio are encrypted on the device with AES-256, the key stays in the iOS Keychain, and there is no Stash server, so the developer cannot see or recover your files. Stash on the App Store.
Every guide in this section
- Apps cheating wives use: the four kinds of privacy apps and what a partner can still see.
- How do cheaters hide things on their phone?: six methods and the trace each one leaves.
- Apps cheating husbands use: messaging, separate accounts and vaults.
- Best app to hide an affair from a spouse: what to check before choosing one.
- Evidence of infidelity on iPhone: where it actually lives on the phone.
- Secret apps for cheating: what they are and how they get noticed.
- Can my wife see hidden photos on my iPhone?: the Hidden album, the passcode and shared accounts.
- Keeping an affair secret on iPhone: what the phone reveals by default.
- Hiding an extramarital relationship on your phone: why shared accounts decide most of it.
- Apps cheaters use to hide photos and files: sorted by file type.
- Where do cheaters hide photos on iPhone?: the places photos end up.
- Calculator app to hide affair photos: how calculator vaults work and how they are spotted.
- How to hide an affair on iPhone: files, messages, location and the rest.
- How to hide secret lover photos on iPhone: find every copy first.
- Photos from the other man: how chat pictures land in your iPhone library.
- How to catch a cheater on iPhone: the signs, what is legal, and what to do instead.
FAQ
What apps do cheaters use?
Mostly ordinary privacy apps: photo and file vaults, vaults disguised as a calculator, messengers with locked or disappearing chats, second-number apps and private browsers. The built-in Hidden album and locked notes are used even more often, because nothing has to be installed.
What is the most common secret cheating app?
There is no single one. Disguised vault apps, especially calculator vaults, come up most in searches, because their first screen looks like an ordinary tool. They still appear in iPhone Storage and in the App Store purchase history.
Can hidden apps be found on an iPhone?
Yes. A third-party app hidden with iOS 18 sits in the Hidden folder at the bottom of App Library, and every installed app appears in Settings > General > iPhone Storage with its size.
Is having a vault app a sign of cheating?
No. A vault app shows that someone keeps some files private, nothing more. Many people use one for documents, health information or photos that should not appear when they hand the phone to someone.