One Tap Lock is a free Android application developed by Caple Studio that allows you to lock your screen with just one tap. It's a replacement for the power button, which can be useful if your power button is broken or not working properly.

With the full version of One Tap Lock, you can customize the shortcut icon and name, create flexible shortcut icons, and have a quick launch with an icon on the Quick Settings of the status bar. It's also easy to manage activated permissions and unlock using biometric methods for Android 9 and above.

It's worth noting that this app uses the Device Administrator permission and Accessibility Service to lock the screen. One Tap Lock is a simple and straightforward app that does its job well. If you're looking for an easy way to lock your screen, this app is definitely worth checking out.