Too Noisy

Too moisy is an app, and when noise level has reached an unacceptable level, it lets children (because it is especially useful for classrooms) know in an engaging and fun way.
If there is a louder activity, its tolerable noise level can be adjusted.
If the predefined noise level is exceeded more than three seconds, Too Noise appears to shatter the screen of your device and an Audible Alert is sounded.
It has also Star Awards rewards system.
If the classroom is quite for 1 minute to 15 minutes (length of time can be set), it notifies you.
Or you can set it for full lesson (for example 50 minutes) Too noisy divides it by 10. And every 5 minutes it gives 1 star. (totally 10)
Too Noisy may be a cool way to keep the classroom quite. It will be funnier for kids.
It costs 4.99 $.