Harry’s Laptimer (Petrolhead Edition)

Prices: £14.99, iOS; £13.99, Android

Developed by an enthusiast for enthusiasts, and refined using enthusiasts’ feedback, Harry’s is one of the most comprehensive data loggers. Initially, the price put us off, but it offers instructions on how to get the best out of the app, and a clear interface helps you navigate easily around the rich data collection. Add video functionality and useful analysis options, and it looks good value, plus much of the circuit info is generated by other users. It’s a real community effort.