ADAC Fahr + Spar is a free Android app developed by ADAC e.V. for its car insurance policyholders with TariffThe app records and analyzes your driving behavior based on several criteria such as acceleration, braking, cornering, speed, time of day, and road type. It then calculates your bonus and premium refund based on how safely and efficiently you drive. The app also provides helpful tips and tricks to help you improve your driving skills and earn more medals.

With ADAC Fahr + Spar, you can track your progress, compare your driving skills with other users, and share your achievements on social media. The app also offers additional features such as a trip log, find my car function, vehicle and driver profiles, Bluetooth interface, and accident reporting.

Overall, ADAC Fahr + Spar is an effective telematics-based app that promotes safer and more efficient driving while rewarding users with lower premiums and bonus refunds. However, keep in mind that using the app may drain your phone's battery, so make sure to charge it while driving.