AppLock Pro - App Lock & Guard

Review by eFreeware

Most privacy tools on Android try to hide in the background. AppLock Pro takes the opposite approach: it puts a visible barrier in front of the apps and media you would rather not hand over, and it dresses that barrier up with a few tricks. The one that stands out is the spy camera, which the developer says takes a front-facing photo after five failed password attempts and stores it away. That single feature tells you a lot about the audience this app was built for.

It is a free download from App Lock LLC, sitting in the Productivity category, with ads and in-app purchases present. The numbers are hard to argue with: more than 100 million installs and a 4.4 average across just over two million ratings, first released in May 2018 and updated again in October 2026. That kind of scale suggests a tool people keep installed rather than try once.

So who is it for? Anyone who shares a phone, hands it to a child or a colleague, or simply wants a second lock on top of the one Android already provides. The app is built around locking other apps, the photo gallery and chat apps, and it adds enough optional extras that you can decide how much theater you want alongside the basic protection.

Locking apps, chats and the gallery

The core job is straightforward. You choose the apps you want protected, and from then on they sit behind an unlock step. The list the developer mentions covers the usual suspects, including WhatsApp, Instagram, Messenger, the Gallery and even Settings. Locking Settings matters more than it first appears, because it is one of the ways someone could try to remove the protection entirely.

You get a choice of how to unlock. There is a four to eight digit PIN, a pattern, a fingerprint where the device supports it, and KnockCode, which the developer describes as a unique unlock method based on tapping a sequence. Having four options is more than most people need, but the variety is useful when a fingerprint reader is unreliable or when you want something quicker than typing digits.

The gallery angle deserves its own mention, because photos are often the thing people actually care about. The app's approach is to lock the Gallery app itself rather than run a separate vault, so access to your media is blocked at the door. If your photos live in a gallery app you are willing to lock, that is a clean solution.

The snoop-catching extras

Beyond the basic lock, AppLock Pro leans into catching whoever is poking around. The spy camera is the headline: after five wrong password attempts, the app takes a photo with the front camera and keeps it. The spy alarm goes further, sounding loudly when the wrong password is entered several times. Together they turn a quiet lock screen into something that reacts.

There is also the fake error message, which shows a made-up error screen instead of announcing that the app is locked. It is a small piece of misdirection, and for some people it will be the difference between a curious friend giving up and a curious friend trying harder. The app can hide or block notifications from locked apps as well, which stops a locked messaging app from spilling its contents across the screen.

Two timing controls round things out. You can set the lock to disable itself during certain hours, and you can have it re-lock after a short break so a quick handoff does not leave everything open. The second one is the more useful of the two in daily life, since it closes the gap between unlocking an app and putting the phone down.

Website blocking and the permission behind it

AppLock Pro also includes a Website Blocker, and this is the part worth reading carefully before you turn it on. It relies on Android's Accessibility Service, which is normally reserved for tools that help people interact with the screen. The developer is unusually direct about why: Android offers no other way for an app to detect which page a browser is showing.

Once the feature is enabled and the permission granted, the service reads the web address in the address bar of supported browsers, which are Google Chrome and Samsung Internet, and shows a block screen when you open a site or category you have chosen to block. It is used only for that purpose, and only after you enable it. No screen recording, keystroke logging, password reading or page content access is involved.

You stay in control of it. Website Blocker can be switched off inside the app whenever you like, and the permission can be revoked in Android's Settings under Accessibility, which stops the service completely. If you never enable the feature, none of this applies to you.

Setting it up and keeping it in place

Getting started is mostly a matter of picking a lock method and choosing which apps to protect. Permissions are requested only where a feature needs them, such as custom backgrounds. There is a secret answer tied to your password, which is the route back in if you forget it, so it is worth choosing something you will actually remember rather than something clever.

The other setup question is how to stop the lock from being removed. The developer's own advice is to lock system settings and turn on Hide Icon, which keeps the app out of sight and puts a locked door in front of the settings screen someone would use to uninstall it. That combination is the practical answer to the obvious weakness of any locker.

Customization is part of the setup too. You can change the look with themes and set your own photo from the gallery as a background. The app is described as lightweight and optimized for battery and RAM, and its settings include vibration, alerts when a new app is installed, and an option to lock recent apps.

Who gets the most out of it

This is a tool for people who need a barrier rather than a vault. If you hand your phone to other people regularly, or you want a second layer over the lock screen Android already gives you, the combination of app locking, notification hiding and the fake error screen covers the common cases well. The spy camera and alarm are for anyone who wants to know when someone has been trying.

The app is free to download, carries ads and offers in-app purchases. That is the trade you are making, and it is worth knowing before you commit a password to it. The scale of the install base and the 4.4 average suggest plenty of people find that trade acceptable.

If your interest is mainly in hiding photos, the gallery-locking approach is what you are working with here, and it depends on the gallery app being one you can lock. If your interest is in blocking sites, that feature is available but comes with the Accessibility Service permission described above. Both are reasonable, and both are worth understanding before you rely on them.

A practical lock for a shared phone

AppLock Pro does one job well and adds a layer of deterrence on top. Locking apps, chats and the gallery behind a PIN, pattern, fingerprint or KnockCode is the heart of it, and the snoop-catching extras give it a personality that a plain locker lacks. The Website Blocker extends the idea to browsing, provided you are comfortable granting the Accessibility Service permission it needs.

It is not a substitute for a proper device lock, and it will not encrypt anything. What it does is put a deliberate obstacle in front of the apps you choose, which is exactly what a shared phone needs. The free download, the ads and the in-app purchases are part of the package, and the install numbers suggest most people decide that is fine.

Install it, lock your messaging apps and your gallery, set a secret answer you will remember, and lock Settings so the whole thing stays put.