I made a little app that lets you to calibrate your turntable by putting on any record and tapping a button. It's called Grooved and it uses your phone's microphone to see how fast your platter is going, almost like magic.

You can see what it looks like in action here: https://twitter.com/OKatBest/status/1795453042994680148

The app itself is free without ads, subscriptions, or trackers. It's a tool I built for myself, and I just thought someone else might want to use it too. I have never seen this technology being used before, all other apps require you to either print something and use the camera, or to place your phone on the spinning platter and use the accelerometer.

You can grab it on the App Store, and I am working on an Android version I hope to release at some point in June.

Would love to hear what you think about it!

Ivan_