Tuner.

A simple, ad-free guitar tuner with an eye for design. Tuner. uses a clear user interface to help you find the right notes for your guitar strings. The animations and live frequency tracker provide clear visualisations.
When orange is shown, the note is too low, tune the guitar upwards until you fill the circle and the guitar is in tune.
When red, the note is too high, the guitar string should be tuned down until you see the green indicator.
Tuner. was built with design in mind, providing the clearest and most intuitive way to hit the right notes.