Norton App Lock is the one of the best app lock software in all app lock category . It is very easy to use. One of the best feature of this app is, "keep app locked in session". It mains if you want to lock your app every time during app use, then click on that, and if you want to lock app only one time(at the time of start) than don’t click on that. It is very useful. One of the most important feature of this app is no ads. You can switch to app and phone without ads.