Very simple concept - app detects notifications sent by other apps (only with your permission). You choose which apps to 'listen' for notifications from. App then briefly flashes screen on  so you 'notice' the notification. You can control how long screen pops on for. Worked brilliantly on lollipop. Like another user reported recently though  it interferes with sound notifications now. Some work. Some don't (e.g. whatsapp). Such a shame. Really nice app otherwise. Will definitely score more highly if dev can fix this problem. Sony z3 compact (unrooted) running official Sony marshmallow build (6.0.1 - 23.5.A.0.575)
June 28 2016