Set it and forget it. Very light app, You should never notice it taking any battery or causing any delay anywhere.
Fully functional app; the in-app purchase is only for a donate button.
- Since KitKat doesn't have priority mode, goes to silent. - Does not support OS's with sound profiles active. - There is no Android API to find out what your lollipop "downtime" is set to, so if you have a meeting that starts before your down time, and ends during your downtime, it will turn the sound back on.