linotune

This is the most comprehensive application for tuning any musical instrument on any platform. It's the only tuner you'll need.

If musical instruments are your passion LinoTune is what you need. It can't help but find the fundamental frequency of any noise it's fed. It shows exactly how far out of tune a note is and has a very helpful set of bars that turn green when a note is in tune. There's also an automatic mode that is really fantastic. After sifting through dozens of tuning applications, I found LinoTune to be the easiest and most effective to use.

This app is better than any other tuning app that you can find in App store. Easy to use, and helps to save your time. It’s funny that someone leaves poor review only because he to lazy to read description! The linotune is hands down best in this category.