# Speedometer Simple — Free Online GPS Speedometer

> Speedometer Simple is a free GPS speedometer app for iPhone and iPad by WATT APPS, rated 4.7 with over 110,000 ratings on the US App Store. It uses the phone's GPS hardware to measure true ground speed with large, readable fonts, and supports mph, km/h, and knots. Features: trip recording with post-trip statistics (max speed, average speed, traveled distance), optional compass and city display, 20+ interface color themes, and HUD (windshield mirror) mode. Free with ads; Remove Ads and Premium in-app purchases available (prices vary by country). Requires iOS 15 or later. App Store: https://apps.apple.com/us/app/speedometer-simple/id939507215

## Pages

- [Home](https://speedometersimple.com/): Free online browser speedometer (GPS-based, works on mobile), real app screenshots, verified user reviews, and an FAQ on GPS speed accuracy.

## Key facts

- GPS speedometers measure true ground speed via satellites, typically accurate within ±0.5 km/h in open areas.
- Car dashboard speedometers read high by design: regulations such as UNECE Regulation 39 require they never under-read and allow up to roughly 10% over-reading.
- The iOS app works completely offline — GPS needs no internet connection. Only the web tool needs internet to load.
- Works for any activity: driving, cycling, running, and boating (knots supported for nautical use).
- A phone GPS speedometer can serve as a temporary reference if a car's speedometer breaks, but most countries legally require a working built-in speedometer.
- HUD mode mirrors the display so its windshield reflection reads correctly at night.
- Removal of the app's trip data and all functions is local to the device; recording is started and stopped manually in the app.