The two main ways to password-protect apps on Android

Android gives you two built-in routes to lock apps: app lock (part of your phone's security settings) and biometric locks (fingerprint or face recognition). Which one you use depends on your phone model and what you're trying to protect.

Most newer Android phones (Samsung Galaxy S10 and later, Google Pixel 6 and later, and others running Android 10 or newer) have app lock built into Settings under Security or Biometrics. Older phones may not have this feature at all — if you don't find it, you'll need a third-party app instead.

The built-in method is simpler and more reliable because it's part of your phone's operating system. Third-party apps work on any Android phone but add another password to remember and depend on a company that may stop updating the app.

Key Takeaways

  • Most Android phones made after 2019 have a built-in app lock in Settings under Security or Biometrics and Passwords.
  • Built-in app lock uses your phone's existing unlock method (PIN, pattern, or biometric) rather than creating a new password.
  • You can lock individual apps one at a time — there's no master list where you select multiple apps at once.
  • Third-party app lock apps work on older phones but require you to remember a separate password and trust a third-party company with access to your phone's security.

How to use built-in app lock on Samsung phones

On Samsung Galaxy phones, open Settings and tap Biometrics and Security (or just Security on older models). Look for App Lock or find Folder — the exact name varies by model year.

Tap App Lock, then tap the toggle to turn it on. Your phone will ask you to confirm your PIN, pattern, or biometric (fingerprint or face). Once you confirm, you'll see a list of apps on your phone. Tap the toggle next to any app you want to lock. The next time someone opens that app, they'll need to use your phone's unlock method to get in.

You can lock as many or as few apps as you want. Banking apps, email, messaging, and photo galleries are the most common choices. If you change your mind, go back to App Lock and toggle off any app you no longer want locked.

How to use built-in app lock on Google Pixel and other Android phones

On Google Pixel phones running Android 13 or later, open Settings and go to Security and Privacy. Tap App Lock. Your phone will ask you to confirm your PIN, pattern, or biometric.

Once confirmed, you'll see a list of apps. Tap the lock icon next to any app you want to protect. That app is now locked. The next time it's opened, the person using your phone will see a lock screen asking for your PIN, pattern, or fingerprint.

Other Android phones (OnePlus, Motorola, Nothing, and others) may have app lock under slightly different names — look in Settings under Security, Privacy, or Advanced Security. The process is the same: find the app lock setting, turn it on, confirm your unlock method, then toggle on the apps you want to protect.

Using third-party app lock apps if your phone doesn't have built-in app lock

If your phone doesn't have a built-in app lock feature, you can use a third-party app. AppLock (by DoMobile), Norton App Lock, and Keepsafe are widely used options available in the Google Play Store. Each one works slightly differently, but the basic idea is the same: you create a separate password, then select which apps to lock.

The trade-off is that you now have another password to remember, and you're trusting a third-party company with access to your phone's app data. Read the app's privacy policy before installing — some collect usage data or require permissions that go beyond what app locking actually needs.

read the app from the Google Play Store, open it, and follow the setup wizard. You'll create a password (or use your fingerprint if the app supports it), then select which apps to lock. The app will ask for permission to monitor your phone — this is normal and necessary for the app to work, but it's also why you should only use app lock apps from companies you trust.

What happens when someone tries to open a locked app

When a locked app is opened, the phone shows a lock screen before the app opens. On built-in app lock, this is your phone's normal unlock screen — the same PIN, pattern, or fingerprint you use to unlock your phone. On third-party apps, it's a separate password screen created by that app.

If the wrong PIN or password is entered, the app doesn't open. Most third-party app lock apps let you set a limit on how many wrong attempts are allowed before the app locks for a period of time — this slows down someone trying to guess your password.

Built-in app lock doesn't have a wrong-attempt limit because it uses your phone's main unlock method, which already has its own security limits.

Common reasons app lock doesn't work the way you expect

If you lock an app but it still opens without asking for a password, the most common reason is that you're already unlocked your phone. Most app lock systems only ask for a password when the phone is locked or after a certain amount of time has passed. Once you unlock your phone, locked apps open freely until you lock the phone again.

If you're using a third-party app lock and it stops working, the app may have been uninstalled, disabled, or the company may have stopped supporting it. Check that the app is still installed and enabled in your phone's app settings. If it's not working at all, uninstall it and try a different one.

Some apps (especially banking apps and password managers) have their own built-in lock feature separate from your phone's app lock. If you see a lock screen when opening an app, check whether it's from your phone's app lock or from the app itself — they work independently.

Frequently Asked Questions

Can I lock an app with a different password than my phone's unlock code?

Built-in app lock uses your phone's existing PIN, pattern, or biometric — you can't create a separate password for individual apps. If you want a different password for specific apps, you need a third-party app lock app that lets you set a custom password.

What if I forget the password I set in a third-party app lock app?

Most third-party app lock apps have a recovery option, usually a backup PIN or a recovery email. Check the app's settings or help section before you lock anything. If you've already locked apps and forgotten the password, you may need to uninstall the app (which usually unlocks the apps) and start over.

Does app lock protect my data if my phone is stolen?

App lock slows down someone using your phone while it's unlocked, but it doesn't protect your data if your phone is stolen and the thief unlocks it. For real protection against theft, use your phone's built-in remote lock and erase features (Find My Mobile on Samsung, Find My Device on Google Pixel) and enable full-disk encryption in Settings.

Can I lock the Settings app itself?

Built-in app lock usually doesn't let you lock Settings or other system apps — these are protected differently. Some third-party app lock apps claim to lock Settings, but this can cause problems with your phone's stability. It's safer to use your phone's built-in parental controls if you want to restrict access to Settings.

Will app lock slow down my phone?

Built-in app lock has no noticeable effect on speed. Third-party app lock apps run in the background and may use a small amount of battery and memory, but most modern phones handle this without any slowdown you'd notice.