I’m constantly forgetting my tuner at rehearsals. This has become a pain, because I leave it at home on my music stand, then rush out the door without checking. So, I’ve started looking for a tuner app for my iPhone. Cleartune is my app of choice. It’s amazing! This is the best tuner I’ve come across for the iPhone. It’s about $3.99, but I must say that the free ones aren’t exactly what I was looking for. This one has adjustment settings just like an actual tuner. This was also the easiest to use. Read all about it here.