RPM - Turntable Speed Accuracy for iPhone

So you’re spinning records and suddenly hear that tiny wobble in the music - like the record’s not quite keeping time. Yeah, that’s wow and flutter, and unless your turntable’s calibrated, it’s probably there. I’ve been on a mission to fix my old Yamaha’s speed drift, and this app? It’s the only thing that actually showed me what was going wrong. No guesswork, no analog meters - just numbers and a scrolling graph that shows every little hiccup in real time.

The good stuff

It’s wild how accurate the gyro sensor is on an iPhone. I held my phone flat on the platter while playing a 33 1/3 RPM test record, and the app immediately started tracking variations. The graph scrolls live, so you can watch the line jump up and down - and man, mine was doing cartwheels at first. After adjusting the belt tension, I ran it again and saw the line smooth out. That visual feedback is instant, tangible proof something changed. Also, the ability to save sessions is a nice touch. I saved three runs after tweaking my tonearm height and could compare them side by side. And the Worldwide RPM Database? Kinda cool. Seeing how my turntable stacks up against thousands of others made me feel less alone in the hobby.

The not-so-good

It’s not perfect. The app doesn’t tell you *how* to fix anything - it just shows you the problem. So if you don’t already know how turntables work, this might just be confusing. Also, it’s not super intuitive. I had to fiddle around for a few minutes to figure out which button paused the recording vs. stopped it. And yeah, the developer is unknown, license is unclear - that’s a bit of a red flag for some people. But honestly, the app works so well and it’s free that I’m not losing sleep over it. Just don’t expect polished UI or detailed troubleshooting tips.

Bottom line

If you’re into vinyl and want to know whether your turntable is spinning true, RPM - Turntable Speed Accuracy for iPhone is a solid free tool. It’s not flashy, but it does exactly what it says - measure speed accuracy with real data. For audiophiles who care about precision, it’s worth the download. If you’re just casually spinning records, maybe skip it. But if you’ve ever thought “is my record actually spinning right?” - this app answers that question better than any other I’ve tried. Try it. You’ll either get obsessed or finally relax knowing everything’s in sync. Either way, it’s free. That’s a win.