By Dave Hayden
Open iTunes to buy and download apps.
Spin Tuner is a simple but powerful tuner, ideal for stringed instruments. Select a preset instrument or create your own—for each note in the tuning, Spin Tuner sums the microphone input against the reference signal and shows you the relative phase and amplitude. Or in plain English: When the spinner stops spinning, you're in tune.
I made this because I was disappointed there weren't any good free tuners in the App Store. If you like it and feel an overwhelming urge to pay something for it, I've added a fancy color mode as an In-App Purchase. IT'S LIKE A DISCO IN YOUR PANTS!
What's New in Version 1.0.1
Disabled backgrounding to work around bug where audio stutters after returning from background
Changed default instrument to Ukulele, because I hope that's what you're playing