Spin Tuner is a simple but powerful tuner, ideal for stringed instruments. Select a preset instrument or create your ownfor 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.nnI 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 InApp Purchase. IT'S LIKE A DISCO IN YOUR PANTSnnEnjoy