LapChrono

Finally, a professional multi driver chronometer for motor sports for your smart phone!
LapChrono measures lap and sector times for four drivers in smart phones. In tablets with a screen of over 7 inches lap and sector times for six drivers. LapChrono also displays the best lap - and sector times for each driver for you. The amount of sectors can be also set from zero to four sectors and you can set the numbers for drivers you are following so it is easy to remember them. You can also save the lap and sector times in a file for later analysis.
The free version supports lap time measurement for one driver. The full version is available for a 7 days free test period after which you need to subscribe in Google Play to the 12 months subscription of the full version to continue using it. Without a subscription you can continue to use the free version of LapChrono. The subscription is tied with your Google account and you can use the app in all devices in which you use the same Google account.