RPM Speed & Wow
Put your phone on the turntable the nearer to the center as possible, and you can:
- start the turntable and look at the rotational speed of it;
- click "start" on the app and start the turntable: the app waits 10 seconds in order to have a steady speed, then acquires data for other 10 seconds and displays average, max-min RPM values and wow estimation.
While still spinning, the app becomes red where the turntable runs faster than the average, and blue where the turntable runs slower. The feature is active until the phone is lifted up from the platter.
Offset correction: if you do a measure with the phone flat and steady, the mean rpm value will be automatically set as an offset for the next measurements. Offset correction remains active until the app is closed and reloaded. Active Offset-correction is indicated by a text message.
Click "reset" to reset the app to do another measurement (this does not reset the offset of the current session).
Click on the speed number to re-align it.
RPM S & W requires that your phone has a gyroscope.
Uses jjoe64 Graphview library.
Enjoy vinyl listening!
Update history:
1.6.8
- Wrong message when the speed is "perfect": corrected.
1.6.7
- The offset correction now applies also to the text rotation.
- Big bug in offset-correction corrected.
1.6.5
- Correction for gyroscope sensor offset added: if you do a measure with the phone flat and steady, the mean rpm value will be automatically set as an offset for the next measurements. Offset correction remains active until the app is closed and reloaded. Active Offset-correction is indicated by a text message.
1.6.0
- Colorfest! Now the app becomes red where the turntable runs faster than the average, and blue where the turntable runs slower. You can see where the speed changes happen. Achtung: don't worry, variations are totally normal in every turntable!
- Sensor noise filtering algorithm was rewritten.
- Clearer (and greener) average line in the graph.
1.5.2
- Average line in the graph view added.
- Solved a graphic problem with certain text size general settings.
1.5.0
- Major update! Graph visualization of the acquired data.
- Better management of the sensor noise.
- Increased resolution of the acquired data.
1.1.2
- Wow algorithm's resolution improved.
- Minor graphic modifications.
1.1.1
- Wow calculation error message corrected.
- Calculation of the deviation from the correct speed corrected.
1.1
- Added Wow estimation!
- Added 16 2/3 rpm to the recognized speeds.
- Now the average RPM shows with 2 decimals.
1.0.1
- Minor update: controls if your smartphone has a gyroscope.
1.0
- First release.
Category : Music & Audio
Reviews (25)
I wanted something simple to check the speed on my new used turntable and adjust it accordingly. This app does the job fast and is extremly easy to use. Idea for improvement: It took me a while to find the notes how to use it (maybe it is just me). I guess a "How to use" button that shows a simple list of steps would make things even easier for users that do not have much experience with the app store. Rating of 5 because everything works just fine. Thanks!!!
I always knew my turntable was a bit off by a few RPM and your app confirms it. Thank you for that. And also this app is quite simple and very easy to use so thank you very much! Oh but there's one thing. When it tried to pick up rpm of my TT at 33 1/3rpm and the reading shows around 30rpm, it told me that it's not a real turntable speed. Overall it's great to overview your turntable performance.
Very useful free app for vinyl heads. I checked the accuracy with my turntable's strobe when going exactly 33.33 RPM, & it measured 33.27 RPM. Finally figured out how to recalibrate - simply put it on a level flat surface (motionless, like your properly levelled turntable, not turned on) and press "Start". This will reset the system. After re-calibration, the app measured my table at 33.32. Decent! The wow spec will bug audiophiles, however, as it shows higher readings than published specs.
Absolutely brought my estate sale turntable back to life! This was my first endeavor with a belt driven table and I attempted to print of a stroboscope graph out in order to check the speed with a strobe app (horrible apps for this... dont bother). This app made all those items cumbersome and obsolete! Get this if you care to adjust your table's speed!
It works! I installed the app on two mobile phones, an S7 Edge and a P20 PRO. They gave me pretty consistent readings and helped me readjust my turntable speed because it had drifted somehow over time. I got a speed of 33.2 rpm and a wow of 0.16%, which is rather good for an 8 years old belt! I guess I should be getting me a new one soon. In conclusion, this is a very good app. I would pay gladly two or three EUROS if the app would keep updating and all.
really nice app man! one usabiliy suggestion: please make the "start" and "reset" button much larger; like 1/4 of the screen. i was doing repeated measures on a vintage TT at 33 and it's difficult to hit them tiny "reset" then "start" buttons. it was almost impossible at 78. 😱 16 was easy tho. 🙂 thanks.
It works great with my Pixel 2 XL, is quick and easy. Tested on my direct-drive quartz servo Denon DP-59L, and got this result: 33.33 33-1/3 RPM, +0.00% WOW ±0.02% Of course I don't know how correct that is (I don't have a reference meter), but running the test 5 times delivered almost exactly the same results, so the repeatability is high.
This app is perfect and super easy to use! Just make sure to read the directions in the About section in the Play Store because there aren't any directions in the app itself.
Didn't work for me. It just kept telling me that it wasn't a turntable speed! I installed a different app that read 33.43 speed on the same turntable.
Always the same message: not a real turntable speed 0.12. My turntable has no issues. Other turntable, same message. My phone: Huawei p smart. Maybe my gyroscope is defective.. Its a great idea to check the wow and flutter with an app. Sadly, that app does not work with my phone.
This app is amazing. 5 stars! It doesn't play well with Samsung phones though.. It'll read 0.2 fast. The Samsung gyroscope's must be off. I wish there were a way to tare it for Samsung. I use it on an old LG. Doesn't like my NOTE 9, S9 plus of Note 8. They all read 0.2 rpm fast. Works on LG phones. Great tool to help setup a turntable.
Brilliant app, sorted my turntable speed within seconds, tried a strobe app but it didn't help, tried this, played a song through you tube and synced it with the player to check out it's accurate and at the end of the song they were still in sync so the app works a treat. Used my Huawei p20 . Great thanks
Worked! I have a Fluance, apparently many of these tend to start dragging without any real reason. Didn't want to go to Tulsa for a strobe disc, figured I'd see if there was an app. Score! & too any that read where it's not perfect w/Samsung, I'm using an S10, & no problems great app! Handy. Now if someone would sell me an old school Pioneer Pl 10, or 12. I'd have it all, tomorrow the world.
I downloaded your app to me phone and I am very happy with it. I had a problem with my turntable where the motor was designed to operate at 60 Hz. years ago I moved to a difference country where the voltage was 220v and 50 Hz, instead of the 110v and 60 Hz. Clearly, the rpm of the TT was off by 10% and it sounded it. Instead of chasing after a new motor (from a company that no longer exist) I simply 3d printed a new pulley and the problem was solved. Your app was a critical part of the QA process confirming the speed(pulley diameter) was right. FOR THAT I AM GREAT-FULL TO YOU !!! I did noticed a problem ,however, after taking multiple readings of the TT rotation, the program seem to get "STUCK" and refuse to reset itself. The numbered display would keep on turning despite the fact that the phone was no longer rotating on the patter, it would simply refuse to stop. Even after a hard reset the app would come back up as if it is resting on a rotating patter..... I love the app and I am grateful to you and admire your talent.
Wonderful App - I was at wits end when my turntable started playing slowly. I adjusted trim pots, etc. But I wasnt sure if it was right. Well, this app proved I was only .2% off of being at the correct rpm. A MUST HAVE IF YOUR TURNTABLE IS OUT OF WACK.
Installed this app to check speed on my rega turntable it really does work tried it with the standard belt the deck was running fast tried it with audio analogue upgraded belt running near spot on 33.6 the record clamp/weight makes a difference drags the motor slowing the deck down we checked for accuracy on my friend's direct drive calibrated deck and it's accurate it's a useful download to have plus it's free
Used this to tune my Audio Technica LP60. Speed was going too fast. Simple and easy to use. Never rate any apps but had to give props where props are due. Thank you!!!
Seems accurate. Might include some kind of basic pop up instructions. Didn't initially realize I had to physically place phone on turntable. Nice and has no ads. Would recommend.
Didn't measure correctly, as evidenced by the readout not "turning" correctly with the turntable - still rating high as the issue presumably is with my phone. Take the results with a grain of salt!
This app is one of the most accurate I have used. It's user I terface is simple, very easy to use and it just works, even if your phone is off centre
Excellent!!! This app saved me alot of time instead of adjusting speed the old way! Calibrated two different turntables in about 10 minutes. Very well done!
Works decent...my phone is heavy so the wow is crazy...I can see it on the strobes...but works good for checking speed. The closer to center you can get the better
This was excellent to allow testing of a turntable that I repaired. It allowed me to confirm that it was running slowly and then run at the correct speed after fixing (by WD40 BTW).
Helped me get my turntable speed virtually perfect! Hint: I put my phone on top of my 45 puck with the center of the phone over the spindle. Seemed to get slightly more consistent readings this way. YRMV.
This might be the most helpful app I've ever downloaded. It literally solved in 30 seconds a slight turntable speed calibration issue that I've been unable to solve by ear for 10 years. It's highly accurate and super easy. To get my phone in the center of the spinning record, I loaded an old 12" vinyl and put my 45 adapter on top of that, which created a flat surface at the center for my phone to sit on. Result? PERFECT pitch. I wish I'd found this app 10 years ago.