SpeedTrace guides

See your real speed from GPS in big digits, with altitude, heading and max and average speed. What the GPS status means, how speed is smoothed and when not to trust it.

Change the speedometer between km/h, mph, knots and m/s in one tap, and pick metric or imperial distances. Which unit suits driving, cycling, sailing and flying.

Start a trip with one tap, keep recording with the screen off, or turn on automatic trip detection so driving starts it and parking ends it. Permissions and battery tips.

Browse every saved trip with its route, distance, max and average speed and climb, see charts, and share a postcard of the route in the colour of the sky you drove under.

Send a recorded trip to Strava-style tools, Google Earth or a spreadsheet as GPX or CSV from the trip detail screen. What each file contains and how to analyse it.

Turn on posted speed limits from OpenStreetMap with voice and haptic alerts. How the road is matched, why coverage varies, and what happens when no limit is published.

While you record a trip, SpeedTrace shows live speed on the Lock Screen and in the Dynamic Island. What updates, why it can lag, and what happens if the app is killed.

Classic is free; the other 11 dials are paid. Try any for 30 seconds, buy one, or unlock all with Pro. Includes Horizon, Aurora, Chrono, Neon and Analog.

Lay the phone on the dashboard and see a mirrored green speed reflected in the glass at night, turning red over the limit. Setup, brightness, orientation lock and safety.

Stop, arm the timer and launch: SpeedTrace starts and stops the clock and shows splits. How GPS interpolation reaches about 0.15 s, and why it is not a drag strip.

The app is coloured by the sky outside, worked out from the sun angle. Choose day or night appearance, dial colours (Pro) and keep the screen awake while driving.

Trips live on your device and in your own iCloud. No accounts, ads or analytics; the only optional network request is the speed-limit lookup.