CMS Lap Timer is described as 'The Cantrell Motorsports Lap Timer is the easiest to use GPS based lap timer, data recorder, video recorder, and performance analysis app available for smartphones and tablets' and is an app in the Sport & Health category. There are four alternatives to CMS Lap Timer for iPad, iPhone and Android. The best alternative is TrackAddict, which is free. Other great apps like CMS Lap Timer are Harry's LapTimer Grand Prix (Paid), LapTrophy - GPS Lap Timer (Free) and RaceChrono (Freemium).
RaceChrono Pro is lap timer, data logging and data analysis app designed especially for use in motorsports, replacing your traditional lap timers and data loggers. The Pro app also enables you to record videos and overlay them with the logged data.