TuneCrack - TuneCrack stands for: Crack the tuning problem. The importance of tuning is often underestimated.
Pitch Grid Test - Measure your pitch-distance precision recognition. The resulting relative pitch indicator shows your sense for relative pitch.
PitchPerfect - PitchPerfect is a free guitar tuner that is developed by NCH Software. It combines automatic note detection with a user-friendly interface to provide accurate tuning for a variety of six-string instruments.
Semitone - Tuner, metronome, and piano for Android.
Guitar Tuna - GuitarTuna is the easiest, fastest and most accurate guitar tuner app out there!
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.