RPM Calculator

Works on Nexus 5 and Nexus 6P. Looks like iPhone version has more functionality, but even with basic functions, it's a great simple app. Don't need a stupid strobe any more.

Used this to check the speed of a Pioneer PL-A45D. Read 34.2 RPM which seems to me the norm for most others set to 33&1/3

After googling how to fix my squeaking turntable, was paranoid it was running too slow. Like another reviewer said: I googled how to test it! Thanx to instructions from other reviewers on how to use this app, I can stop worrying. Thank you!

Every belt driven turntable slows a tad and this app will make sure you can set it back up appropriately. Great stuff.

Surprisingly accurate on my LG G5. Read about this type of app on FB and they suggested placing a cup over the center of the platter and placing phone on that to prevent platter from being unbalanced. I did that, and the app was showing 33.3 - 33.4 when the strobe light on TT was showing it was at the correct 33.3rpm speed. Wish is had an extra digit after the decimal point. Otherwise, great app!

Very nice app, but on my phone it is not accurate. Checking with a couple of different independent methods, this app reports rpm about 2% slower than actual.

Simple. But that burger icon looks so out of place.

I Think this is a great App, works very well on my galaxy S6 Phone... would be interesting if it had a set tone for 33.3 speed but this is very good the way it is now.. Thank you for your dedication on this.

Works well on LG G6. 2 decimal precision would be appreciated if phone sensors can support.

How cool is that!

Brilliant, so simple to use. Thanks

Good thanks

This seems to work well. I noticed that the Linn table in the video runs at 34+rpm. That would be consistant with my old Linn. My current table show 33.5rpm which is close enough as I don't have perfect pitch nor does anyone I know. It would be nice if it would log a period of time - like maybe about 5 or 10 minutes to see if there a fluctuations over time. Other wise great app.

Worked pretty straightforward. Pop on the TT and adjust the speed until it says 33.3 or 45.0 (phone flew off when I tried to do 78rpm, but I guess blutac or something could hold it in place.

This app works wonderfully. I am now able to compare the accuracy of Pro-Ject turntables with AC motors (Debut Carbon and RPM 1.3), as well as various belts. 16VAC wall transformer vs Speed Box S. The 18VAC fed Speed Box S is much more stable than the wall wart plugged into standard power conditioner. However, the AC wall wart seems to work just as well as the Speed Box when plugged into an ACRegenerator (I use Panamax 5500 series).

Ridiculously good- I have Sutherland timeline, Platter Speed, and two other RPM strobe discs - total cost >$1000 but this free and my Simon Yorke is 33.3-.4 by just placing the phone on the platter. duh!!

Pretty good app. Does a decent enough job for those of us who don't have anything more accurate available to us.

Will not work on my Galaxy S4. Just displays 0.0 and A Small Box With Reset angle. Tapped box, it just turns green. Reinstalled a couple of times. No go. So hoped it would have worked.

Can't thank you enough for this app. Calibrated my turntable in seconds!

My device Do not support correct sensor

Very easy to use watch the promo video first my rpm was 37.5 was able to bring it down to 33

Can't use on ASUS phone. Lousy app

Just put the phone on the platter and measure the RPM.if you have pitch control then you can fine tune the RPM with amazing accuracy.

Super easy to use and works great for a quick speed check. Seems relatively accurate on my Yamaha pf800 and note 3.

Anyone confused by how to use it just read the title! Literally just lay your phone on the turntable and start it up (obviously don't move the tone arm). The display actually rotates to make it readable whilst spinning. Apparently I'm running at 31.7 and 43.5, although I'm wondering if that slight speed reduction is caused by the weight of my (quite heavy) phone? Obviously can't test the speed with a record playing to see if I can hear the difference.

Does not appear to be very accurate. Tried on 4 turntables that were at 33.3 according to their built in strobe. All registered about 32 RPM +/- a couple tenths. Seems to report a bit slow.

This seems to work well. I noticed that the Linn table in the video runs at 34+rpm. That would be consistant with my old Linn. My current table show 33.5rpm which is close enough as I don't have perfect pitch nor does anyone I know. It would be nice if it would log a period of time - like maybe about 5 or 10 minutes to see if there a fluctuations over time. Other wise great app.

Used this to check the speed of a Pioneer PL-A45D. Read 34.2 RPM which seems to me the norm for most others set to 33&1/3

Had no problems and it worked well until I went from a S3 to a S6. Very random readings now. Hope it can be fixed.

Very good idea. Good app but must be a little bit precise. I can see some differences between manual measures and this app...

I repair turntables and this works for me. Strobe discs are hard for some to understand. Customers can read this simple display.

As another reviewer wrote, the app isn't perfect, but it's consistent. For example, my ideal 45rpm was reading between 45.3-6 (it synced almost perfectly with the .mp3 version of the song I used). It might not even be the app's fault; maybe it's just that the hardware between each phone is a little different. Life I said, though: it gets the job done.

Works perfectly on an Honor 6+ and a Lenco GL75 turntable. One of those brilliant apps that you don't realise you need until you have it!

I use it to check/adjust the speed of my Rek-O-Kut idler 'table which takes 30 mins to warm up to cruising speed. (It's an old broadcast 'table). I wish the app had a calibration feature though. It started reading 0.3 at rest a while back. I wonder if it would be easy enough to add the ability to reset it to zero in the settings or by a long press or something. Thanks for offering the app!

I heard that a lot of turntables spin too fast. This app put my mind at rest that I'm hearing things at the right pitch! Does what it says on the tin. No frills!

I'm getting 34.5 and 6 what is the purpose of this app? It works though..

Nice app perfect for comparing my turntables relative speeds. Well done

I figure it's accurate but haven't cross checked. If it is then this app is super simple and quite awesome.

The moment you realise how this app works... Priceless!

It was giving me readings of 31.9 on my Galaxy S4 when my strobe told me it was 33.3. But it was consistent and I could use 31.9 as my reference. Numbers were clear and very easy to read as they turned to face you at all times. This app could be a winner with a bit of tweeking. A second decimal place would also be nice.