RaceChrono Pro

★★★★★ Best app for track days. You can see where you can improve your laps, record video with speed overlays, starts the video on the GoPro automatically. Developer is always updating with new features. Totally worth the pro version

★★★★★ Great app for track days. Pair with external GPS and Obd2 and you have a robust data acquisition system.

★★★★★ I use this app to record lap times to review between session and output overlaid lap videos from my gopro footage. It works at a circuit style course where you do lap after lap (use a start/finish gate), and also on an autocross style course where the start and end are different locations (use separate start and end gates). If I mess up the gates or want to adjust split locations, the analysis will update based on track config associated with the session. Very helpful. The raw gopro data embedded on its mp4 files are compatible with RaceChrono Pro, and the import/session creation is simple. If you do outdoor rec karting or amateur autosports and want to own your own data, at least give the free version a go.

★★☆☆☆ Using internal camera, Pressed record for video, and it says it is, time counts down but nothing is recorded, gutted, was really looking forward to watching my laps back from the day, but I have nothing. Without the video I might as well have the free version than waste 17.99 on this. Real shame. If know one helps me then I will probably ask for my money back

★★☆☆☆ App records 8 laps but says I went 0 miles and has no lap info. Also, shows 4 video files recorded but when u click on it, says "no video available". Plus tons of other bugs that make it a frustrating and useless app. This is REALLY BASIC FUNCTIONALITY THAT JUST DOESN'T WORK. Don't waste ur money. Go with Harry's Lap Timer. Update: I'm sure it works in the right situations and even used to work for me but buggy and now doesn't work with sky pro & GoPro. Says it's recording but doesn't.