(Y only three star.it deserves five or more)Underrated app....this app save my frustration........simple easy to use and accurate ......fantastic baby.........I had bad experience with after sales service of a shop I bought my guzheng from... And it’s freaking expensive to seek tuning service....not to mention is a hassle to carry a guzheng around ..soooo I decide to tune my own .... I tried the other apps all rubbish hard to use and understand ..this one is simple very much ...d major ....string one to twenty one.... Needle float to green means goood. Manage to tune back my guzheng..still noob but is better condition now thanks to this app ........meow hurray hurray