This is the best tuner Ive ever used!
This is simply one of the best tuning tools on the market, and cheap as chips! What makes this one so wonderful is that it shows some graphical pitch history so you can see where your pitch dipped, see the shape of a vibrato and make adjustments in realtime. It also has a useful tone generator that allows you to simultaneously monitor incoming pitch so that you can see if you are matching it when you play/sing. You can even choose what type of tone you want to generate, and it will do it across all the octaves.
As a bonus it also has a very good metronome and a very user friendly interface. Ive used a lot of expensive and inexpensive iOS music apps and this is among the very best!
Gamer luva about
Tunable – Tuner & Metronome, v1