RPM - Pro Turntable Accuracy3.9 - App Store

The best Turntable RPM accuracy test mobile app available. Full functionality, no ads or in-app-purchases.

See the RPM speed variations, wow/flutter, of your turntable in real time graphics like you've never seen before, continuous display makes it easy to make adjustments as necessary if your turntable allows it.

Test the RPM speed and wow/flutter accuracy of your turntable, whether 16, 33 1/3, 45, or 78.

And now with the Worldwide RPM Turntable Accuracy Database you can research what other RPM users are finding out about their turntable's accuracy and what they think of them.

● RPM is proud to be recommended by Rega Research Ltd, makers of some of the best turntables in the world.
● Great review by Techmoan on Youtube
● Used in high end TT reviews in Stereophile magazine

See the wow/flutter accuracy as the max % deviation from the average rpm of the turntable, as well as graphically in the chart.

Save all your rpm test sessions to the history log for review or sharing later.

RPM uses the gyroscope in your iPhone to determine the rotation speed of your turntable, automatically determines which speed setting you're on, and reports how accurate it is.

Simply place your iPhone on your turntable, close to the centre but doesn't have to be over the centre spindle. As the iPhone rotates the display will remain stationary from your perspective for easy reading.

The UNIQUE feature of RPM is that it shows a scrolling graph of the rpm accuracy variation over time, this shows wow/flutter effects, especially those associated with the turntable not being level, belt wear, etc. You can even detect the small drag caused by the stylus resting in the grooves of the record.

The most recent amazing new innovative feature is to visualise wow and flutter variations plotted around the vinyl centre to show a heat map of exactly where in the turntable rotation inaccuracies occur.

There are many ways of testing the average RPM of your turntable, some turntables even have this built in, however there is no other practical way of showing the wow/flutter variation over time than RPM.

The history graph parameters can be customised to:
- Set the moving average sample size.
- Accuracy at which to turn the rpm circle sold green.
- Set a duration after which the display updates will freeze so they can continue to be read after the turntable is stopped.

The RPM realtime display is reliant on the iPhones gyroscope accuracy, if you suspect yours isn't quite right then you can now use Calibration Mode to auto test and then apply any necessary correction in real time.
This auto calibration uses the compass to count the turntable revolutions, if you have an older iPhone (not iPhone 6S or newer) then this may be unreliable, in this case you can still add your own multiplier if you have done an independent calibration.

Extensive testing means we're now confident that using RPM can help you setup your turntable to be within 0.1% of its target RPM, assuming your turntable can be adjusted and is itself stable within that tolerance of course.

V3 brings The World RPM Turntable Performance Database, accepting submissions from RPM users worldwide to build the ultimate resource for researching the most accurate turntables out there. Upgrade to join in and upload your own turntable data, go to Settings and make sure you have the Freeze time set then do an RPM session as normal. At the end of the time you will be asked to name your session after which you will have the option to also upload it to the World DB. You can always upload from History later too."

Version History Vastly improved download speed of the Worldwide Turntable database 3.9 04/05/2022 Performance enhancements - the RPM World DB is now fetched at a lower to improve the performance for everyone.
The RPM World TT DB now has over 8,100 entries and has become an important resource for all Turntable enthusiasts. 3.8 01/27/2022 Due to popular demand the World TT Database is now searchable by make and model. There are now nearly 5000 uploads of turntable accuracy data and ratings from turntable enthusiasts all around the world.

Updated settings screen with more help.
Added additional onboarding help screens.

For those testing old 16rpm turntables the accuracy results have been corrected to calculate against 16 2/3 rpm, oops! 3.7 10/13/2020 World DB Stats now shows Top 50 Makes & Models
iOS13 Ready 3.6 03/13/2020 minor bug fix 3.5 03/14/2019 small bug fix 3.4 03/08/2019 The World TT DB is now cached locally on the device so it doesn't have to be downloaded every time.
New DB Stats Screen showing Top Makes and Models in the World TT Database. 3.3 03/06/2019 The World Database may now be sorted by Accuracy, Wow/Flutter, Rating, or grouped by Make/Model.
When uploading to the World Turntable Database you may now delete or replace existing submissions as required.
The list of Turntable Makes is now searchable to make it easier to upload your recordings. 3.2 10/09/2018 Bug fix affecting some rpm accuracy figures stored in MyHistory and WorldDB.
The World RPM Turntable Performance Database is up and running, accepting submissions from RPM users worldwide to build the ultimate resource for researching the most accurate turntables out there. 3.1 09/22/2018 The World RPM Turntable Performance Database is up and running, accepting submissions from RPM users worldwide to build the ultimate resource for researching the most accurate turntables out there. 3.0 09/13/2018 Show continuous rpm display even if turntable is very inaccurate. 1.7 04/10/2018 You can now save your rpm tests to the history log for viewing and sharing later.

Fixed an issue where some handsets with an unreliable compass will show zero rpm.
Option to hide 'Uncalibrated?' Button.
Fix issue where centre circle didn't turn green unless 360 trace was on.
New icon to distinguish it from the free to try version. 1.6 04/01/2018 If you own a turntable RPM is a must have.
Calibration Mode is here!
The RPM realtime display is reliant on the iPhones gyroscope accuracy, if you suspect yours isn't quite right then you can now use Calibration Mode to auto test and then apply any necessary correction in real time.
This auto calibration uses the compass to count the turntable revolutions, if you have an older iPhone (iPhone 6 or older) then this may be unreliable, in this case you can still add your own multiplier if you have done an independent calibration.
Extensive testing means we're now confident that using RPM can help you setup your turntable to be within 0.1% of its target RPM, assuming your turntable can be adjusted and is itself stable within that tolerance of course.
Update ensures you can correctly enter your own calibration value in any Region. 1.5 03/15/2018 Calibration Mode is here!
The RPM realtime display is reliant on the iPhones gyroscope accuracy, if you suspect yours isn't quite right then you can now use Calibration Mode to auto test and then apply any necessary correction in real time.
This auto calibration uses the compass to count the turntable revolutions, if you have an older iPhone (iPhone 6 or older) then this may be unreliable, in this case you can still add your own multiplier if you have done an independent calibration.
Extensive testing means we're now confident that using RPM can help you setup your turntable to be within 0.1% of its target RPM, assuming your turntable can be adjusted and is itself stable within that tolerance of course. 1.4 03/14/2018 Improved graphing efficiency to remove lag reported by some users. 1.3 01/26/2018 Now displays the actual wow/flutter accuracy figure as the max % deviation from the average rpm of the turntable, the real time graphing of the accuracy variation over time is still there of course.
Improve positioning of vertical lines which indicate each revolution.
Display target RPM on centre line of graph. 1.2 01/22/2018 Bug fix, wasn't auto detecting 16,45,& 78 rpm speeds. 1.1 08/03/2017 1.0 08/01/2017