Power measurement application

Clockwatts overview

  • The app measures your vehicle’s real-time and peak power and automatically stores all data for later analysis.

  • Works fully independently without external devices or vehicle connections.

  • Utilizes your phone’s GPS and built-in sensors to calculate power and speed.

  • Compatible with almost any type of vehicle, whether it’s an electric scooter, motorcycle, passenger car, or heavy-duty vehicle.

  • The app is designed for track use.

Getting ready for power measurement

  • For best results, determine your vehicle’s total weight as accurately as possible before measurement.

  • The settings include example values for other parameters.

  • Use the app on a flat surface and preferably in calm weather to ensure the most accurate results.

  • Use of the app is at the user’s own risk.

If you know your vehicle’s exact frontal area, rolling resistance coefficient, and drag coefficient, enter them in the settings to achieve even more accurate results.

Power measurement report

  • When the measurement ends, the app automatically generates a clear report of the test results.

  • The report includes a line chart showing the vehicle’s power and speed over the measurement period.

  • The chart can be saved for later analysis.

  • With the phone’s internal GPS, the maximum measurement duration is typically 30–60 minutes.

  • With an external GPS device, the maximum duration is about 10 minutes.

Support for External GPS Device

  • The app supports the RaceBox Mini device, which provides significantly faster location updates and more accurate measurement results.

  • It also includes a feature that takes uphill and downhill gradients into account during power measurement - this feature is available only when using the RaceBox Mini device.

Download Clockwatts and start measuring power easily and affordably!

Unlimited power measurements for just €9.99.

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Frequently asked questions

Clockwatts uses your device's location data to calculate your car's instantaneous and maximum power during driving. The app combines the values obtained through positioning with calculations based on the laws of physics to provide an estimate of the power produced by your car.

Clockwatts can be purchased from the Google Play Store for 9.99 EUR. If you use a different currency, Google Play will display the app's price in your local currency.

The Clockwatts app serves a different purpose than traditional dynamometer power measurements. Clockwatts is designed to provide real-time information about power during driving. Traditional dynamometer testing is used in controlled conditions for tasks like engine tuning and determining peak power. Even if your car's peak power is known, the Clockwatts app offers interesting insights into how much power is required to maintain speed and during accelerations.

Yes, you can measure power from an automatic transmission car using the Clockwatts app. The type of transmission does not affect positioning-based power measurement.

The Clockwatts app works in all cars regardless of the type of power source, including electric cars.

Clockwatts is available for Android devices with Android 9 or newer operating systems and GPS capability. The Clockwatts app is currently not available for iOS devices.