App Lock is a free Android app developed by Wings on Droid that offers a password protection feature for any application on your device. With a simple and attractive UI design, App Lock is fast, stable, secure, and reliable, taking up less memory. It provides numeric lock protection with a minimum of 4 digits and a maximum of 8 digits. In case you forget the PIN, the app offers a forget PIN feature, and you can update the PIN anytime. Also, you can set a security word for finding a forgotten password. If the locker does not work, you can click on the start service button.

Overall, App Lock is an excellent app for those who want to protect their privacy and secure their personal data on their Android device.