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Great! In the past I've used the app that measures the turntable speed through its accelerometer...it's somewhat uncomfortable and weird to set the mobile on the turntable, start and stop once and again. Would love to see a comparison of measurements taken with your app and the one using the accelerometer...calibration is a huge thing in engineering.

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I'm gonna be honest, using the accelerometer will definitely be more accurate because you can take more samples over a longer period of time. That's how this project started, but I also felt uncomfortable putting my brand new phone on a fragile player and even more so asking other people to do the same.

Grooved is still very accurate, especially if you run multiple measurements to confirm on multiple songs/records. The threshold for "perfection" in the app is 0.01%, which to me anything beyond that is a rounding error and I could not tell the difference in my tests. This is equal to a drift of about a third of a second over an hour of listening.

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