Tun-d is a rock-solid, hands-free guitar & stringed instrument tuner developed with a focus on simplicity, accuracy & performance. Tun-d has a high-contrast, bright & stable display making it the easiest, user-friendly tuner available for the iPhone. Standard, chromatic and
alternate tuning presets for guitar. Also presets for banjo, ukulele,
mandolin, violin, viola, cello and more.