Video tachometer

Video tachometer

Strobe light effect, RPM meter

84 ratings
51 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • December 28, 2019
  • July 7, 2026
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iphone
ipad
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About

This app uses slow-motion video to create a strobe light effect, allowing you to measure rotational speeds. It records video with detailed information like frame rate and exposure, and offers customizable text overlays.

Strobe light effect simulation
Rotational speed measurement (RPM/Hz)
Slow-motion video recording
Customizable text overlays on video
Adjustable frame rate and exposure
Records 4K video (if supported)
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What's New in Video tachometer

2.1.8

July 7, 2026

• Full support for iPad.

1

In-App Purchases

$2.99

Full version

Fine tuning the frame rate.

User reviews

Works

Wanted to check RPM. I knew what it should be. 1125. I set this app to 1130 and my mark almost stopped, 1140 it spun backwards slowly. Just right. Very cool.

Response from developer

Thanks for your feedback! In the full version, you can select the frame rate for 1125 RPM. In the free version, the frame rate selection accuracy is ±10 RPM (or ±0.1 Hz), in the paid version, the frame rate selection accuracy is ±1 RPM (or ±0.01 Hz).

It works, just need

The app is very good, it takes a few tries to get the right settings to understand the different options and how they can be used, nothing impossible to do, if you try the app different settings you will find them very useful, after a few tries you will find the settings that are the best for you to use and understand. Excellent app just practice to master the settings.
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Полезное приложение.

Понадобилось измерить обороты bldc мотора от машины, все получилось отлично.
Понятное и удобное приложение.

Super Useful

I don't own a lot of tools (being a college student), so when I wanted to measure the RPM of my Lego motor to determine its torque, I was stuck. Looking on the AppStore was a last, desperate measure, but man, I'm glad I did. The free version of the app work beautifully and offers great control and features. And, the +-10RPM is not a huge deal. Overall, would absolutely recommend. Many thanks to the developer for providing this tool for free!
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Классный инструмент

Отличное приложение. Сегодня собирал стенд, в котором использовался частотник. С помощью приложения получилось выставить нужные мне обороты электродвигателя. Так же проверил правильно ли я рассчитал шкивы. Однозначно рекомендую всем кто занимается ремонтом и диагностикой различных механизмов. Мощный карманный инструмент.
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Developer apps

FAQ

What does this app do?

This application utilizes the slow-motion video recording capabilities of your smartphone to create a strobe light effect. This effect allows you to visually freeze parts of a rotating object, enabling the measurement of its rotational speed in Hertz (Hz) or Revolutions Per Minute (RPM).

How accurate is the speed measurement?

The app provides measurements in both Hertz (Hz) and Revolutions Per Minute (RPM). The Hertz value is considered more accurate as RPM is calculated from Hertz and involves rounding. The accuracy also depends on factors like good lighting, clear video, and manual focus adjustment.

What are the system requirements?

Your smartphone must support slow-motion video recording, which is standard on iPhones starting with the iPhone 5S. Specific ranges for measurement are available for different iPhone models, with newer models supporting higher frame rates and RPM ranges.

Can I record videos with measurement data?

Yes, the app can record video and add text with important information directly to the frames. You can choose to include the selected frame rate, exposure duration, ISO, timestamp, and time difference between frames, with options to customize the text color or omit it entirely.

Is this app free to use?

The application is available for free with the option for in-app purchases. This suggests that while core functionality may be free, certain advanced features or enhancements might require a purchase.