The Martin Tuner is a free app from Martin Guitar for iPad, iPhone, and Android devices.
The app is an interactive tool perfect for guitar players of every skill.
It includes a fully chromatic tuner and ear trainer to help you dial in your guitar whether you are a beginner or a pro.
You will also have access to a number of “Dave Doll’s Pro Tips” episodes to learn everything from properly restringing your guitar to using a capo.
Thinking of creating a Martin custom guitar? The Martin Custom Shop Builder is also available through the app.