RPM - Pro Turntable Accuracy is a full-featured mobile app for the iPhone that tests the RPM speed accuracy of your turntable. It is an ad-free and in-app purchase-free app that provides real-time graphical displays of RPM speed variations and wow/flutter effects. With the Worldwide RPM Turntable Accuracy Database, you can research what other RPM users are finding out about their turntable accuracy and what they think of them.

The app uses the gyroscope in your iPhone to determine the rotation speed of your turntable and automatically determines which speed setting you're on. It reports how accurate it is and shows a scrolling graph of the RPM accuracy variation over time, which shows wow/flutter effects, especially those associated with the turntable not being level, belt wear, etc. The most recent innovative feature is to visualize wow and flutter variations plotted around the vinyl center to show a heat map of exactly where in the turntable rotation inaccuracies occur.