LockToApp

LockToApp is the best app locker on the market!
Lock WhatsApp, Line, Twitter, Facebook, and all apps you want, Never worry again about someone seeing your private data!
You can lock individual apps with patern lock or pin.
Don’t worry when someone borrow your phone read your privacy.
All this with very less battery and memory consumption!
Features:
* Consume battery charge
* Easy to access
* Customizable background
* Completely free
* Small screen support
* The fastest on the market
* Choose pattern or password/pin lock
* Change pattern color
* You can set custom image from gallery in pattern and pin lock screen
* Hide App from applications so nobody can see it's installed
* Custom unlock message
* Also lock system apps