Nice, but let it run for a bit – RPM - Turntable Speed Accuracy Review

This app is good, although I highly recommend running in calibration mode first. Before I did that on a rega rp3, it was reading way faster than the strobe disk, but once auto calibrated it was quite close. This is with an iPhone XR. I’m still a bit confused about wow and flutter and the circular trace it does. My sense is that it it showing unevenness in rotation and platter flatness, but for wow and flutter the relevant thing is what is happening where the needle touches the record. I’m, not sure if this w&F measure is comparable to what other folks measure. I did take heart, though, that my W&F readings were generally around .2, which seems to be about what most turntables in the database show...but I have no idea if other TT measurement systems would come up with the same number.
Review by Bradbort on RPM - Turntable Speed Accuracy.