This app is very useful and recommended, if you want to concentrate on any task.
You try to start other apps, this app displays a confirmation message.
And this app sends notification at regular intervals during other apps use.
You can save a list of frequently used settings.And you can specify the time with scheduling feature.
If you try it anyway, recommend "Lock Lite"(free).
Features:
-Simple operation
-Lock time, notification interval and times, options
-Support display customized
-Task List(Full version only)
-Schedule(Full version only)
Start time, end time, repeate date, options
-Remove iAd(Full version only)
-Support more display customized(Full version only)
ProgressBar, 24-Hour Time(ON/OFF), etc.