古琴调音器PRO-麦克风自动调音 app for iPhone and iPad
This is an free Guqin Tuner created by ukulele player, a very good tuner you need:
Pro version provides Pic Tabs Collection features,and removes ads.
1. Designed for Guqin.
2. Smart algorithms for the best.
3. Not only D key, but also all Guqin keys.
4. Easy to use.