What's the best Android app for verifying if my car or bike's speedometer is accurate?

Speedometer is a GPS-based application that provides real-time speed data, making it a practical tool for users needing to verify the accuracy of their vehicle's built-in speedometer. The app displays current speed in both digital and analog formats, which is beneficial for quick reference, especially when the phone is mounted on a motorcycle handlebar or car dashboard. It records comprehensive trip data, including distance traveled, time, average speed, and top speed, with route mapping available in summaries. This functionality is ideal for scenarios like motorcycle maintenance, where tracking riding hours and miles is necessary, or for drivers who suspect calibration issues, as highlighted in user reviews where a state trooper recommended the app after a speedometer discrepancy led to a traffic ticket.

Reviews indicate that the interface is large and clear enough for on-the-go use, and the option to name trips helps with organization. The free version supports core features with ads, while a paid subscription unlocks advanced elements like live map views, which users find affordable. However, some note that the initial subscription banner can be vague to dismiss, and the ad-supported model includes a banner at startup and bottom of the screen, which might be slightly distracting. Despite these minor imperfections, Speedometer remains a reliable choice for speed verification, balancing essential tools with optional enhancements for detailed tracking.