Company Qiaochu Zhu created these great apps:
Ukulele Tuner - Ukutuna, Guitar Tuner - TrueStudio, Violin Tuner - TrueStudio, Erhu Tuner - TrueStudio, Pipa Tuner - TrueStudio, Ukulele Tuner - Ukutuna II, 尤克里里调音大师, 二胡调音大师, 吉他调音大师, 小提琴调音大师, Erhu Tuner - Tuner & Metronome, and others..
