App Lock - Fingerprint Lock

Review by eFreeware

The most distinctive thing about App Lock - Fingerprint Lock is that it treats your phone as something other people will eventually pick up. Rather than one password for the whole device, the app puts a separate lock on individual apps, on your photos and videos, and on the notifications that would otherwise flash across the screen. That framing is what separates it from the built-in screen lock most phones already have.

It comes from 360 Tool and sits in the Productivity category, which is a fair label for something that behaves more like a utility than a security suite. The app is free, carries ads, and offers in-app purchases. With more than 100 million installs and a 4.6 average across roughly 419,000 ratings, it is clearly one of the more widely used options in this corner of the store.

I would expect this to appeal most to people who hand their phone to someone else regularly, whether that is a child, a coworker or a friend who wants to look at a photo. It is not pitched at corporate device management; it is a personal privacy layer for a phone that gets shared.

Locking the apps that matter

The core job is straightforward: you choose which apps sit behind a lock and pick how you want to open them. The app supports a PIN, a pattern or a fingerprint, so the unlock gesture can match whatever feels natural on your device. The developer lists messaging apps, social apps, the Play Store, payment apps and Settings among the things you can protect, which covers the places where private conversations and account details tend to live.

Two smaller touches stand out to me. A single tap is enough to lock an app, and newly installed apps can be locked automatically rather than waiting for you to remember them. There is also uninstall protection, which matters because a lock that can be removed by uninstalling the app is not much of a lock.

The notification side is the part I find most interesting. Sensitive alerts from locked apps can be kept off the screen entirely and read inside the app instead, so a message preview never appears while the phone is sitting on a table. For anyone whose main worry is a glance from across the room, that is arguably more useful than the app lock itself.

Photos, videos and the intruder camera

Beyond apps, the app offers a Gallery Lock for private photos and videos. The idea is that a borrowed phone stays safe even when someone is scrolling through your media, because the files you care about are behind the same password rather than sitting in the ordinary gallery. The developer notes that hiding files requires the All Files Access permission and says it is used only for file protection.

The intruder camera is the feature people tend to mention first. When someone enters the wrong password, the app takes a photo and sends an alert, so you get a record of the attempt rather than just a failed unlock. It is a small thing, but it changes the feeling of the app from passive to watchful.

There is also a junk cleaner that removes app cache, ad junk, similar photos, large videos and screenshots. It is an odd fit next to the privacy tools, and I would treat it as a bonus rather than the reason to install. Still, on a phone that is short on space, having it in the same place as the lock screen is convenient.

Disguises, themes and the smaller settings

Icon disguise lets the app hide behind something innocuous, with Calculator and Weather given as examples. If someone is looking for a locker and does not find one, they are less likely to try to open it. It is a simple idea, and it pairs well with the invisible pattern option, which hides the line you draw so a bystander cannot follow your unlock gesture.

Custom themes let you set your own photo as the lock screen background or choose from themed designs. This is cosmetic, but a lock screen you see dozens of times a day is worth being able to change. The random keyboard option adds another small layer by shuffling the key layout, which makes a PIN harder to read from a distance.

Auto re-lock is the setting I would reach for first. You can set timers so the app skips the password at certain times and then locks again afterward, which keeps the protection in place without asking for a fingerprint every thirty seconds. A private web browser rounds out the extra tools, and cloud backup is not available yet.

What it needs from you

Setup is not complicated, but the app does ask for one significant permission. To hide private files, it requires All Files Access, which is the broad permission Android reserves for file managers and similar tools.

The app was released in May 2023 and the most recent update is dated August 31, 2026, so it is actively maintained. It is free to download, shows ads, and includes in-app purchases. The presence of both ads and purchases is worth knowing before you commit to it as your daily privacy layer.

If you use a fingerprint, the experience depends on your phone's sensor rather than the app itself. On a device with a reliable reader, unlocking becomes nearly invisible; on one without, you will be typing a PIN or drawing a pattern far more often, and the auto re-lock timers become much more important.

Where this app fits

This is a good match for someone who shares a phone and wants a straightforward way to keep certain apps, photos and messages out of view. The combination of app locking, notification blocking and a hidden gallery covers the three places private material usually sits, and the disguise and intruder camera options add deterrence without much effort.

It also suits people who want one place to handle several small housekeeping jobs. The junk cleaner and private browser are not the headline features, but they mean you are not installing three separate utilities. For a free app with this many installs, that breadth is the main draw.

Where I would be more cautious is with anyone expecting a hardened security product. This is a privacy layer built around convenience, with ads and purchases attached and a broad file permission at its center. It raises the effort required to snoop on your phone; it does not turn the phone into a vault.

A practical lock for a shared phone

App Lock - Fingerprint Lock does one job well and several others adequately. The app locking, notification hiding and gallery protection are the reasons to install it, and the PIN, pattern and fingerprint options mean it can fit the way you already unlock your phone. The intruder camera and icon disguise give it a bit more character than the average locker.

The trade-offs are clear enough. It is free but ad-supported and offers in-app purchases, and hiding files depends on granting All Files Access. Cloud backup is not available yet, so I would not count on it.

If you share a device and want a simple, widely used way to keep private apps, photos and alerts away from other eyes, this is a reasonable choice. If you need something closer to managed device security, the app's focus on everyday convenience will feel like the wrong tool.