App Lock: Lock App,Fingerprint

Opening App Lock for the First Time

The moment App Lock finishes installing and you tap the icon, you are not asked to create an account. There is no email sign-up, no password, and no subscription prompt. The app drops you directly into a setup screen. The interface is clean. A large button says "Set Password." You tap it. You choose a lock type: pattern, PIN, or fingerprint. The app guides you through the setup. It asks you to draw a pattern or enter a PIN. It then asks you to confirm it. The process takes less than a minute. Once set, the app asks for accessibility permission. This is for battery saving and faster locking. The app also asks for storage permission. This is for hiding photos and videos. The app does not request location, contacts, or camera permissions. This is a positive privacy signal. You then select which apps to lock. The app lists all installed apps. You toggle the ones you want to protect. The list includes social apps, messaging apps, and system apps. You can lock Settings, Gallery, and even the Play Store. The app does not have a tutorial. It does not have a walkthrough. It assumes you know what you are doing. The onboarding is fast. The app respects your time. It does not force you to watch a video. It does not lock content behind a paywall. It just lets you set up and go. The app is free. It does not have ads during setup. The experience is straightforward.

Invisible Patterns and Random Keyboards: A Layered Security Approach

The invisible pattern path and the random keyboard are two features that work together to prevent shoulder surfing. The invisible pattern path hides the trail as you draw your pattern. No one can see the lines on the screen. This makes it harder for someone to guess your pattern by watching your finger. The random keyboard shuffles the numbers each time you enter your PIN. The numbers are not in the same position as a standard keypad. This prevents someone from guessing your PIN by tracking where you tap. Together, these features create a layered security approach. You can use both. You can set a pattern for some apps and a PIN for others. The app does not force you to choose one. The interaction is seamless. However, there is a catch. The invisible pattern path is not enabled by default. You have to turn it on in settings. The app does not explain this during setup. You have to discover it. The random keyboard is also optional. You have to enable it. The app does not highlight these features. This is a missed opportunity. They are powerful privacy tools. They are buried in settings. The app also has a feature to auto-detect new apps. When you install a new app, the app prompts you to lock it. This is useful. It ensures you do not forget to protect a new app. The interaction between the invisible pattern, random keyboard, and auto-detect features is not described on the Play Store. You have to use the app to find them. The app could benefit from a better onboarding flow. It could highlight these features. It could explain how they work together. The current approach is functional but not user-friendly.

Performance, Bugs, and the Free Model

The real-world performance of App Lock is a mixed bag. The app locks apps quickly. The fingerprint unlock is fast when it works. The app is generally stable. However, the app has issues. Users have reported fingerprint failures. The fingerprint sensor sometimes does not recognize the registered fingerprint. This is a recurring complaint. Users have also reported password rejection. The app rejects the correct password. This locks users out of their apps. This is a critical bug. It can render the phone unusable. Some users have been locked out of Settings and other system apps. They had to reset their phones. The app also has reliability problems. It sometimes fails to lock apps. It sometimes crashes. The app has a known vulnerability. CVE-2025-68710 affects version 1.9.2. The vulnerability allows a local attacker with physical access to bypass the PIN lock. The lock is implemented as an overlay. It does not use Android's secure authentication APIs. This is a serious security flaw. The developer has not released a fix. The app is free. It does not have ads. This is a major selling point. The app is supported by the developer's other projects. The developer, MOBILEMATRIX PTE. LTD., is based in Singapore. The company has been operating since 2012. The app has a high rating. 4.24 stars from 26,714 ratings is impressive. Most users are satisfied. The negative reviews highlight the bugs and vulnerabilities. The app's customer support is responsive. The developer replies to reviews. The app is a work in progress. It has potential. It needs more polish. The free model is attractive. The lack of ads is a strong point. The app's performance is acceptable for casual use. For heavy users, the bugs may be frustrating.

Storage Permission and the 11.68 MB Download

The APK file for App Lock is around 11.68 MB. The exact size varies by version. The app requires Android 6.0 or higher. The app requests storage permission. This is used to hide photos and videos. The app does not access your photos or other files without permission. The permission is solely for the vault feature. The app also requests accessibility service permission. This is for battery saving and faster locking. The app does not use this permission for any other purpose. The app does not request location, camera, or contacts permissions. This is a strong privacy feature. The app is transparent about its data practices. The app does not share data with third parties. Data is encrypted in transit. The app collects app activity and device ID. This is standard for analytics. The app does not collect personal data. The small download size is a benefit for users with limited storage. It also reduces data usage. The app is optimized for mobile devices. The app is also available on iOS, but under a different developer. The iOS version is called "AppLock - photo lock App" by a different developer. This is a different app. The Android version is the one from MOBILEMATRIX PTE. LTD. The app is free. It does not have in-app purchases. The app is honest about its limitations. It is not perfect. It has bugs. It has vulnerabilities. But it is free. It is ad-free. It is a simple way to lock apps. The storage permission is a minor requirement. It is a small price to pay for a free app locker.