Tune your mandolin with precision and ease, instantly! · The most accurate - detects the exact sound frequency in Hz. · Smart Chords Library, Tuning fork and Advanced Settings (In-App purchases) · Highest responsiveness and sensitivity. · Intuitive user interface with LED tuning indicator. · Visual indicators - tuned string lights up. · Universal app - works with iPhone, iPad and iPod touch. Got ideas? Questions? Please send us your feedback through our site or to feedback@daikyoujulabs.com