Ratio Calc! vs LapMonitor Usage & Stats

Ratio Calc is a quick and easy tool for radio control car racers to use trackside. Knowing your final drive ratio (FDR) is very useful for comparison with other racers to determine if your car is geared correctly. It lets you quickly select your car by filtering on manufacturer and model. Select your pinion and spur size and the FDR is displayed. Tyre diameter can also be entered to calculate your rollout. Ratio and roll out charts are also available which plot pinion and spur gear combinations to create very handy reference tables. - Save your favourite cars for quick access - Select measurement units (imperial/metric) - Select your preferred gear pitch, alternative ratios in other pitches will be shown - Over 2000 cars/variants in the database which is updated regularly

Apple App Store
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LapMonitor

LapMonitor is the companion application of the LapMonitor device, the best lap counter for RC cars. It allows single racer lap timing or multi-racers. It includes the following features: - Connect to a LapMonitor device over Bluetooth; - Configure and start a multi-drivers race; - Display the driver ranking and race data in real-time (number of laps, last lap, best lap…); - Use speech synthesis to announce important race events; - Display detailed laps information for any driver in the race; - Automatically save race data on your device, and you can view the race details later in the Session History screen; - Export race data as a text file; - Share race data with your friend by email, Twitter, cloud file services…