TACTSON TUNER MASTER (iOS) app for FREE

Tune Master turns your iPhone/iPod/iPad into a portable instrument tuner with most of the common instruments tuning modes, such as guitar, bass, violin, ukulele, Mandolin, Banjo, Dobro, Bouzouki, Dulcimer, Bagpipe and 2 Chinese traditional instruments, Guzheng and Erhu. There are some kinds of tuning modes for each instrument also, such as FLAT tuning, Drop D/Drop C tuning.+