How to Lock Apps on Android: Built-In Tools and App Lock Compared

You hand your unlocked phone to a friend to show them a photo, and thirty seconds later they are reading your WhatsApp messages. We have all been there. Learning how to lock apps on Android puts a fingerprint, PIN, or face check between curious eyes and your most sensitive apps — banking, messaging, email, photos — even when the phone itself is unlocked.

In this guide, you will learn how to lock apps on Android using the built-in tools on Samsung, Xiaomi, and OnePlus phones, what to do on Pixel and stock Android where no native lock exists, and how third-party app locks compare. By the end, you will know exactly which method fits your phone and your threat level.

App Lock vs. Secure Folder: Which to Use

Samsung phones offer two different locks and they solve different problems. App lock (Settings > Security and privacy > App lock, or Secure Folder on older One UI) asks for your fingerprint or PIN every time the app opens — good for messaging and banking apps you open constantly. Secure Folder is a separate encrypted container with its own copies of apps: better for hiding the very existence of apps, since locked apps still appear in your app drawer while Secure Folder contents are invisible until you unlock the folder itself.

On Pixel and Motorola phones there is no built-in app lock, so use the work profile trick: install “Island” or “Shelter” from the Play Store, clone sensitive apps into the work profile, and pause the work profile when you hand your phone to someone. Pausing freezes those apps completely — no notifications, no background activity. Whatever method you pick, enable it for gallery and file manager apps too; most people lock WhatsApp but forget the gallery holds the same photos.

The Short Answer: How to Lock Apps on Android by Brand

• Samsung: No per-app lock built in — use Secure Folder (separately locked container) instead.
• Xiaomi / Redmi / POCO: Settings > Apps > App lock — native, excellent, supports fingerprint.
• OnePlus: Settings > Privacy > App Locker — native, clean, fingerprint-supported.
• Pixel / Motorola / stock Android: No built-in per-app lock — use Private Space (Android 15+) for hiding plus a reputable third-party app lock, or both.
• Vivo / iQOO / Oppo / Realme: Built-in app lock in Settings > Security (names vary slightly).

If your phone has a native option, use it — built-in locks are more reliable, use less battery, and cannot be uninstalled by someone borrowing your phone.

Method 1: Samsung — Secure Folder as Your App Lock

Samsung’s One UI famously lacks a simple per-app lock, which frustrates new Galaxy owners looking up how to lock apps on Android. Samsung’s answer is Secure Folder, and once you understand it, it is arguably better than a basic app lock.

Setting it up

1. Go to Settings > Security and privacy > Secure Folder and tap Continue.
2. Sign in with your Samsung account and choose a lock type — fingerprint plus PIN is ideal.
3. Tap Add apps and select the apps you want protected (WhatsApp, banking apps, gallery, etc.).
4. Apps inside Secure Folder are separate copies: they need their own logins, which also means a snooper cannot even see your logged-in state from outside.

Why it beats a basic app lock

• The locked apps are invisible outside the folder (combine with hiding the Secure Folder icon itself).
• Files moved into Secure Folder are encrypted by Knox.
• Notifications from inside apps are hidden until you unlock the folder.
• It cannot be bypassed by uninstalling a third-party locker, because there is nothing to uninstall.

The tradeoff

Secure Folder apps are duplicates, so you will sign in twice and use double the storage for those apps. For two or three sensitive apps, that is a non-issue.

Method 2: Xiaomi App Lock — The Gold Standard Built-In

Xiaomi’s MIUI and HyperOS include the best native implementation of how to lock apps on Android:

1. Go to Settings > Apps > App lock and tap Turn on.
2. Set a pattern, PIN, or password, then link your Mi account (for recovery) and enable fingerprint unlock.
3. Select the apps to lock — you can lock virtually any app, including system apps like Settings and the Play Store.
4. Optional: enable Hide notification content for locked apps so message previews do not leak.

Xiaomi also lets you lock apps with face unlock and set per-app lock timing (lock immediately vs. when the screen turns off). It is fast, free, and deeply integrated — the benchmark other brands should copy.

Method 3: OnePlus App Locker

On OnePlus phones running OxygenOS:

1. Go to Settings > Privacy > App Locker.
2. Set your privacy password if prompted, then add apps to the locker.
3. Enable fingerprint unlock for convenience.

Locked apps show a lock screen the moment you open them. OnePlus also offers Hide notification content for locked apps. Pair App Locker with OnePlus Hidden Space (swipe right in the app drawer) and you get both invisibility and a lock — the strongest free combination on any OnePlus device.

Method 4: Pixel, Motorola, and Stock Android — Third-Party App Locks

Google’s Pixel phones and near-stock devices have no built-in per-app lock, which is the most common reason people search for how to lock apps on Android and end up in the Play Store. You have two routes:

Option A: Private Space (Android 15+)

Settings > Security & privacy > Private Space creates a locked, hideable section for sensitive apps. It is not a classic app lock — it is stronger (full isolation) but slightly less convenient (you unlock the space, not the app). For banking and messaging apps, it is the best free option on Pixel.

Option B: Third-party app lock apps

The Play Store is full of app locks, and quality varies wildly. If you go this route:

• Choose one with a long track record and millions of installs — e.g., AppLock by DoMobile, the category’s veteran.
• Check permissions ruthlessly. An app lock needs accessibility or usage-access permission to detect app launches. It does NOT need your contacts, location, or SMS. If it asks, uninstall it.
• Avoid locks stuffed with ads, “RAM boosters,” and battery savers. Those extras are red flags for adware behavior.
• Set a recovery email so a forgotten pattern does not lock you out of your own apps permanently.
• Enable “prevent uninstall” (device-admin permission) so a snooper cannot just delete the locker.

Third-party locks have a fundamental weakness: they can be bypassed in Safe Mode or by uninstalling (unless device-admin is enabled), and aggressive battery optimization can kill them, leaving apps unlocked. Built-in methods do not have these problems — another reason to prefer native tools when available.

Fingerprint vs. Face Unlock for Your App Lock

When you learn how to lock apps on Android, you will choose an unlock method. Here is how they compare for app locks specifically:

• Fingerprint: The sweet spot. Fast (under half a second), works in the dark, and nearly impossible to observe over your shoulder. Register the same finger twice at slightly different angles for better accuracy.
• Face unlock: Convenient but variable. Pixel’s 3D face unlock (Pixel 8/9 Pro class) is genuinely secure; basic 2D face unlock on budget phones can be fooled by a photo. Check whether your phone’s face unlock meets Android’s “Class 3” biometric standard before trusting it with banking apps.
• PIN: The fallback that always works. Use at least 6 digits, never your birth year, and never the same PIN as your lock screen — otherwise the app lock adds zero security against anyone who watched you unlock the phone.
• Pattern: Fast but the weakest option. Smudge trails on the screen can literally reveal your pattern to the next person who picks up the phone. If you must use one, wipe your screen regularly.

Best practice: fingerprint as the daily driver, a strong unique PIN as the fallback. That combination is fast for you and genuinely hard for anyone else.

Locking Apps for Kids and Shared Family Phones

App locks are not just about snooping adults — they are a parenting tool. Lock the Play Store to prevent surprise purchases, lock Settings so kids cannot disable parental controls, and lock browsers or YouTube if you want screen time to stay inside kid-safe apps. On Samsung, put kid-safe apps outside Secure Folder and everything else inside; on Xiaomi, lock Settings, Play Store, and the browser in one tap each. Combine with Digital Wellbeing parental controls for time limits, and the phone becomes genuinely kid-safe rather than merely kid-resistant.

Built-In vs. Third-Party: Honest Comparison

The verdict for how to lock apps on Android: built-in wins whenever your phone offers it. Third-party is a solid plan B on Pixel and stock Android, with Private Space as the free system-level alternative.

What App Locks Cannot Protect

An app lock is one layer, not a complete security system:

• Notifications: Lock the app AND hide its notification content, or messages still preview on the lock screen.
• Widgets: A calendar or email widget on the home screen shows data without opening the app. Remove sensitive widgets.
• Recent apps screen: App thumbnails can reveal content. Some lockers blur recents; enable it if offered.
• Voice assistants: “Hey Google, read my messages” can bypass app locks. Restrict lock-screen assistant access in Settings > Google > Search, Assistant & voice.
• The nuclear bypass: Anyone who knows your main PIN owns everything. Your lock-screen PIN remains the master key — make it strong and different from your app-lock PIN.

For the bigger picture, review which apps can access what in our guide to managing app permissions on Android, consider upgrading from passwords to passkeys on Android, and store the credentials themselves in one of the best password managers for Android.

Google documents device security basics at Android support.

FAQ

Does Android have a built-in app lock?

It depends on the brand. Xiaomi, OnePlus, Vivo, Oppo, and Realme include native app locks. Samsung offers Secure Folder instead. Pixel and stock Android rely on Private Space (Android 15+) or third-party apps. There is no single universal built-in app lock across all of Android.

Can I lock apps on Android with my fingerprint?

Yes — virtually all built-in app locks (Xiaomi, OnePlus) and reputable third-party lockers support fingerprint unlock after you set an initial PIN or pattern. Fingerprint is both faster and harder for onlookers to shoulder-surf than a pattern.

Will an app lock drain my battery?

Built-in locks have negligible impact. Third-party locks use a small amount of battery to monitor app launches — typically 1–3% per day. If a locker is eating far more than that, it is misbehaving; replace it.

Can someone bypass my app lock by restarting the phone?

A proper lock (built-in, or third-party with device-admin/uninstall protection enabled) survives reboots and stays active. Cheap lockers without these protections can sometimes be bypassed in Safe Mode — another reason to prefer built-in tools.

What happens if I forget my app lock password?

Built-in locks offer recovery via your brand account (Mi account, Samsung account) or fingerprint fallback. Third-party lockers usually offer email recovery if you set it up. Without recovery configured, you may need to reinstall the locked apps — and lose local data. Set up recovery the day you enable the lock.

Should I use the same PIN for my lock screen and app lock?

No — never. If someone watches you enter your lock-screen PIN (shoulder surfing is the most common real-world attack), an app lock with the same PIN provides zero additional protection. Use a different PIN, and prefer fingerprint for the app lock so there is nothing to observe at all.

Conclusion

For how to lock apps on Android, the hierarchy is simple: use your phone’s built-in tool if it has one (Xiaomi App Lock, OnePlus App Locker, Samsung Secure Folder), fall back to Private Space on Android 15+, and only then consider a reputable third-party locker — audited for permissions and hardened against uninstall. Lock the apps, silence their notifications, use a different PIN than your lock screen, and your phone becomes borrow-friendly without becoming an open book. Do it today — it takes five minutes, and you will honestly wonder why you waited so long.