App Locker Protect your Privacy. Secure your Data & App with Password or Pattern Lock. Prevent illegal app access/install/uninstall in your phone. â Easy-to-use and user friendly GUI. â One-Tap lock. Simple & Quick. â Lock your common use apps and prevent others from open those apps. â Awesome Themes and Colors! Many for FREE. â AppLock with PIN and Pattern Lock, choose your favorite style to lock. Pattern lock is easier and faster to unlock. PIN lock is enabled with random keyboard with much safer to lock apps . No more worries that people may snoop your password or pattern.