I’ve kept this app handy for years now. It's hard to rate an app as a favorite when you use it only when you're miserable. Really, I'd prefer never to need it again. But for me vertigo is an intermittent reality. Just as Dan says, your cell phone is always with you when vertigo strikes, and sometimes I go months in between attacks, forgetting exactly how each step of the Epley maneuvers goes.
Sure, you can dig up more details on Epleys on the Internet, but this app has been a real timesaving reminder each time I've needed it. I use it with a timer app to time each position. For me, 3 minutes in each position works best, and I don't need to sleep in a chair -- but it's not the same for everyone.
Also, for me, I need to have a bucket within reach when I’m doing Epleys because they sometimes make me suddenly sick to my stomach. Epleys are very worth it, though, even when that happens.
Thanks very much for this app, Dan.