It must be broken?
Quite simply it doesnt work on my 6s running iOS 9.1. Thought I would give it a try but it just resulting in random tuning. 2 other tuning apps worked but this one is the odd defective cousin. Ill wait for an update and if that doesnt work then bye-bye...
T_c_M_;) about
AccuTune - Guitar Tuner, v2.1