Powerful Silent Timer – Vibration Alarm for Library, Train etc.

Doesn’t work with screen locked

This app dies exactly what it says but there is one glaring flaw. If you lock your phone the timer can’t execute the vibrations and you get nothing. This is functionality I would expect from free or ad funded software but I was expecting more from a paid app even if it’s only a buck. Disappointed

Needs an auto restart mode to be perfect

This would be great for presentations if it had an auto restart -- when countdown hits zero, vibrate 2 times then restart the counter. Useful for other activities, like gym, where you want to move from task to task. Would also be nice if it could set time in seconds. Add those 2 features and I'd give it 5 stars.