# RPM - Turntable Speed Accuracy — Real time Wow Flutter checker

> Real-time turntable speed accuracy and wow/flutter measurement tool. (iPhone/iPad app by Philip Broder.)

- Source: https://appshunter.io/ios/app/rpm-turntable-speed-accuracy/id1030889902 (this page in markdown: same URL + `.md`)
- Developer: [Philip Broder](https://appshunter.io/developer/921385513)
- Category: Music, Utilities
- Price: Free with in-app purchases
- Rating: 4.40/5 from 1,665 App Store ratings · 219 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.1 · 17 MB
- Languages: American English
- Released: 2015-12-02
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/rpm-turntable-speed-accuracy/id1030889902/reviews.md

## What is RPM?

The best Turntable RPM accuracy test mobile app available.

See the RPM speed variations, know as 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.

The World RPM Turntable Performance Database now has over 10,000 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.

Upgrade to enable unlimited measurements, continuous display, all settings, all speeds, no ads.

## Key features

- Real-time RPM speed variation display
- Wow/flutter accuracy percentage
- Graphical wow/flutter analysis
- Worldwide turntable accuracy database
- History log for test sessions
- Heat map visualization of inaccuracies
- Calibration mode for gyroscope accuracy

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Upgrades + remove ads. | $14.99 | one-time |


## What do users think of RPM?

Overall sentiment: neutral

**Pros**

- 👍 Easy to use
- 🚀 Accurate speed measurements
- 💡 Helpful for calibrating turntables
- 🔒 Works as advertised

**Cons**

- 🔒 Limited free trial
- 💰 Expensive paid version
- 🐛 Inaccurate measurements on some devices
- 🤖 Constant upgrade prompts

**Commonly reported bugs**

- App freezes or crashes during use
- Measurements not updating properly
- Compatibility issues with certain devices

**Most requested features**

- Ability to save measurement history
- More detailed wow and flutter analysis
- Improved calibration tools

## Recent user reviews (10 of 219)

All indexed reviews: https://appshunter.io/ios/app/rpm-turntable-speed-accuracy/id1030889902/reviews.md

### 1/5 — Scam

*2026-05-30*

Die App erkennt alles zwischen 28 und 36 RPM als erfolgreich kalibriert wobei es logischerweise nur bei 33 bzw 45 anschlagen dürfte. Wahrscheinlich möchte der Entwickler dass die Nutzer möglichst schnell ihre 10 trial Runden erreichen 😉

### 1/5 — This app is illegal to market in its current form in the UK

*2026-04-26, version 5.11*

This app breaches the Digital Markets, Competition and Consumers Act 2024. This bans fees and pricing that is hidden before the contract is made (in this case at the moment the app is downloaded). 

This is because it only operates a limited number of times before a fee is required to continue using it. This fee MUST be shown along with any unavoidable taxes and fees before the app is downloaded.

The penalty for breaching this is a fine of up to 10% of the vendor’s annual turnover. The vendor is the Apple Store.

### 5/5 — Really Great!

*2026-03-07, version 5.11*

I’ve been using this app for years, and I’m absolutely loving it. Easy to use, and considering that it’s a phone app there’s nothing that comes close to it. I just wanted to express my gratitude to the man who developed this real audiophile-oriented app. Thank you very much 🙏🙏🙏

### 3/5 — Gratis?

*2026-02-16, version 5.11*

Ma non era gratis?

### 3/5 — Now I know my TD124 is too slow

*2026-02-08, version 5.11*

I didn’t used it 10x yet. 
As a free alternative you can Phyphox gyroscope and look at z axis. It will give you the rotation speed in rad/s. 
But you won’t have the fluter and the extra features offered here.

### 5/5 — Easily worth $15

*2025-12-14, version 5.11*

Replaced my Marantz TT 42 belt and it played slow. Had no idea what to do but read about this app and happened to have the teeniest flat head screwdriver and now the music sounds great.

### 1/5 — Charging now!?!?

*2025-10-03, version 5.11*

Not worth $15 I had this program before it decided to start charging and I will not be using it anymore after this I will delete this program $15 is ridiculous

### 1/5 — Doesn’t work

*2025-10-03, version 5.11*

Says it check speed. I was spinning as fast but it didn’t do anything
Unusable

### 5/5 — Fantastic tool for turntable

*2025-08-25, version 5.11*

It is very nice app. I use it often for calibrate the turntable speed rotation. Because usually I repair a lot of them. Very easy to use.  Thanks.

### 5/5 — 非常好的功能

*2025-07-06*

洁面很简单直观，功能很好用😽

## Frequently asked questions about RPM

### What does the RPM app do?

This app measures the real-time rotational speed accuracy of your turntable. It displays speed variations, known as wow and flutter, both numerically and graphically, allowing you to make necessary adjustments for optimal audio performance.

### How does the app measure turntable speed?

The app utilizes the gyroscope within your iPhone to determine the rotation speed of your turntable. It automatically detects the speed setting (16, 33 1/3, 45, or 78 RPM) and reports its accuracy.

### Is the app free to use?

The app is free to download and use, offering core functionality for measuring turntable speed and wow/flutter. Additional features and advanced capabilities may be available through in-app purchases.

### What are the benefits of using this app for my turntable?

By providing real-time feedback on speed accuracy and wow/flutter, the app helps you identify and correct inconsistencies. This can lead to improved audio quality, a more stable soundstage, and a better overall listening experience for your vinyl records.

### Can I save and share my turntable test results?

Yes, the app includes a history log where you can save all your RPM test sessions. These saved sessions can be reviewed later or shared, allowing you to track your turntable's performance over time or compare it with others.

## Version history (last 5 releases)

### 5.11 — 2025-05-05

Clear view of selected turntables in History and World TT

### 5.10 — 2022-12-15

Improved messaging and optimisations.

### 5.9 — 2022-07-29

Design and usability tweaks.
With nearly 10,000 uploads to the RPM World Database RPM is the de facto source of turntable performance and popularity.

### 5.8 — 2022-04-05

Vastly improved download speed of the World Turntable Database.

### 5.7 — 2022-01-27

Further enhancements to improve user experience and World TT DB download efficiency.

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## More apps by Philip Broder

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All apps by Philip Broder: https://appshunter.io/developer/921385513

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*