Clockwatts turns your smartphone into a virtual dynamometer that measures your vehicle’s power while driving. The app is designed for track use.

Power is no longer just a number in the specs
The app measures your vehicle’s real-time and peak power and automatically stores all data for later analysis. This allows you to focus on driving and review the results afterward.
• 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.
• Measurement settings can be customized for different vehicles and driving conditions.
• 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.

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 Devices
• 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.

If you know your car’s exact frontal area, rolling resistance coefficient, and drag coefficient, enter them in the settings – this will provide even more accurate measurement results.

Example values for the aerodynamic properties of passenger cars can be found on the app’s website:
https://www.clockwatts.com/Car-listing/

Terms and Conditions:
https://www.clockwatts.com/terms-and-conditions

End-User License Agreement (EULA):
https://www.clockwatts.com/end-user-agreement

Clockwatts: Power measurement