Kids, shared devices and your private files
Children pick up a parent's phone for games, videos and photos, and curiosity does the rest. The simplest protection for your own files is a lock they do not know that closes by itself: an app with its own credential, set to lock as soon as you leave it. This page is about keeping your documents and photos private on a phone the family handles. It is not about monitoring children, and nothing here needs spying on anyone.
What usually goes wrong
Rarely a clever break-in. More often a child asks to watch a video, swipes the wrong way, and lands on a document, a bank letter or a photo you did not mean to show. Or they see you unlock the phone and learn the passcode. Or a tablet shared by the family has everyone's files in the same library. These are accidents of access, and the fixes are simple.
Fix 1: lend one app, not the phone
Apple's Guided Access, described on its support page as locking an iPhone or iPad to a single app, suits this. You turn it on under Settings > Accessibility > Guided Access, open the app you want, and triple-click the side button to start. Under Session Settings you can limit buttons, the keyboard, touch and time. To end the session you authenticate with the Guided Access passcode, Face ID or Touch ID. Apple notes that Crash Detection and Emergency Services are not available during a session, so end it if anyone needs them. Handing someone your iPhone without showing everything
Fix 2: do not let the passcode be learnt
Children watch hands. Choose a passcode you can enter without being copied, and change it if a child has learned it. Apple's page on passcodes describes changing it under Settings > Face ID & Passcode, and says the Expire Previous Passcode option closes the 72-hour window in which the old passcode could reset a new one. When someone knows your iPhone passcode
Fix 3: a separate lock for private files
What helps in a home:
- Auto-lock. By default the Vault closes as soon as you leave the app (a grace of 15 or 60 seconds is a setting). You can also have it lock after 30 seconds, 1 minute or 5 minutes idle, which matters if you put the phone down mid-task.
- A blank app switcher. The app switcher shows a blank screen rather than a preview of what was open.
- A credential kids do not know. Draw a pattern on a 5 x 5 grid, at least six dots, or choose a passphrase. A pattern is drawn on screen and easy to watch; a passphrase is harder to guess. Enter either when no one is looking over your shoulder.
- Slowed guessing. After ten tries in five minutes, each further try waits longer. A child pressing at random gets nowhere quickly.
- A quiet failure. A credential that opens nothing shows an empty Vault, so there is no "wrong" screen to tempt more tries. The Attempt log shows the times of the last 20 failed tries, so you can see whether someone has been trying.
- Folders keep documents together, such as "House", "School", "Tax".
If the family iPad has a single library for everyone, keep your own documents in the Vault rather than the library, and keep private photos out of any shared album.
What not to do
- Do not use a Vault to hide things from a child who needs to see them, such as a medical record or something safety-related.
- Do not store the Recovery Phrase where children can reach it. Write it on paper and keep it somewhere private.
- Do not take the lock as a promise. A determined teenager who has watched you enter a pattern many times can learn it.
Where StrongRoom does not help
- It does not monitor, restrict or filter what a child does. It is not a parental control, and there are no accounts for children.
- It does not hide itself. The icon is on the Home Screen, and a curious child can open it and see a lock.
- It does not protect your files outside the Vault: the photo library, Messages, Mail.
- It cannot stop someone who knows your pattern or passphrase.
- It keeps no copy off the phone. Without an Export Package and the Recovery Phrase, a lost phone means a lost Vault.
- The free app holds one Vault with up to 10 items; more needs Pro.
Frequently asked questions
How do I stop my child finding private photos on my iPhone?
Keep them in an app with its own lock that closes when you leave it, and lend a single app with Guided Access rather than the whole phone.
Does StrongRoom monitor kids?
No. It is for your own files and has no controls for what anyone else does on the phone.
Can children guess my pattern?
Guessing is slowed, but a pattern drawn in front of someone can be learned by watching. A passphrase is harder to guess.
Do I need Pro?
The free app has one Vault for up to 10 items. Pro removes the limit and adds more Vaults.
Sources
- Use Guided Access on iPhone or iPad (Apple Support), checked on 2026-10-30.
- Use a passcode with your iPhone, iPad, or iPod touch (Apple Support), checked on 2026-10-30.