This app let's your colleagues, friends, class know that they're too loud.
Just set the alert level to the desired level and let this app work for you. YOU don't need to confront anybody. Decibel Alert will do:)
If you connect your phone to an external speaker, the alert is even louder.
Not feeling comfortable to let colleagues, friends know that they are too loud? Want to use an alert system in the classroom to keep the noise down? Try this app.
This is the free version.
Paid version comes with no ads and lets you pick any sound from your phone to be played when the alert goes off.