R vs TrackTimer

R-EX is the next-generation high-performance timing application for performance cars. By connecting the high-quality, space-technology GPS device, R-EX, to the application via Bluetooth, you can measure 0-100km/h, 100-200km/h, and similar acceleration times. You can even engage in real-time, live timing sessions with your friends. With the R-EX device, capable of 25 measurements per second (25 Hz), you will achieve more precise timing results.

Turn your iPhone into a precision drag strip timer. Measure 0-60 mph, 0-100 km/h, and any custom speed range up to 400 km/h — no extra hardware needed. THREE MEASUREMENT MODES • GPS Only — Simple, reliable speed tracking • GPS + Accelerometer — Enhanced accuracy with motion sensors • Kalman Filter Fusion — Professional-grade precision rivaling dedicated hardware BUILT FOR THE TRACK • Custom speed ranges (0-60, 0-100, 100-200, or set your own) • Multi-lap session recording with split times • Live speed gauge with GPS and Fusion readouts • GPS signal quality indicator GLOBAL LEADERBOARD Compare your times with drivers worldwide. Upload your best runs and see how you stack up. VEHICLE PROFILES Save multiple vehicles and track performance for each one separately. DETAILED HISTORY Review every run with time, max speed, G-force data, and speed-over-time charts. Designed exclusively for drag strips, race tracks, and closed private areas. Download now and put your car to the test.