My "go-to" guitar tuner
I have a clip on tuner but this is more accurate because I can see how sharp or flat a string really is. This app shows how many cents it is off not just a needle gauge. It also has a strobe tuner which I admit I dont fully understand yet but it helps you see your tuning.
One thing I really like is the chord matrix that will light up to indicate which chord I am playing I find this helpful when I learn new chords to see if Im fingering the notes correctly without looking at the chord chart.
The only downside to a tuner like this is that it needs to be relatively quiet to be accurate. I set the phone as close to my guitar as possible in case there is other noise.
In all, this is a good app. I paid for the upgrades because it wasnt that expensive and I liked all the features. I feel certain of this apps accuracy and usefulness. The developer continues to update it as well.
gurp13 about
PitchLab Guitar Tuner (FREE)