are there any alarm apps that go off on when the phone is on mute?

Have owned both androids and iphones. I currently have an iphone 6 the updated OS.

An important feature TO ME, is the ability to have a 3rd party alarm app go off gradually even if the mute switch in on.

The stock app does cut it, especially since you cant set alarms at different times.

Anyone know if there are any out there, or if one of the features not allowed with iphones?

thx