About this app

Turn your iPhone into a precision performance instrument. Magnitude tracks speed, G-forces, acceleration, and lean angle in real time; using GPS+IMU sensor fusion for smooth, accurate readings. Built for cars and motorcycles. LIVE DASHBOARD • Circular speedometer (0–240 km/h / 0–150 mph) • Friction circle G-force visualization • Motorcycle lean angle gauge (±60°) • Live map & elevation profile PERFORMANCE TESTS • 0–60 / 0–100 timing — fully automatic, no button press needed • Braking test: 60–0 mph with stopping distance • Customizable speed ranges SESSION RECORDING • Continuous logging of speed, G-forces, GPS & altitude • Speed-colored route replay map • Charts: Speed/Time, G-Force, Elevation • Export as CSV, GPX & PNG LIVE ACTIVITY & DYNAMIC ISLAND • Current speed on your lock screen • G-force or lean angle in the Dynamic Island PRO FEATURES • Unlimited sessions • Motorcycle mode with lean angle gauge • Braking test & route replay • Sensor tuning (GPS/IMU balance, up to 60 Hz) • Full statistics dashboard & personal records Track day, canyon run, or daily commute. Know exactly how you drive.

Latest release

What’s New

Version 1.3 May 20, 2026

- Standing-start launch tests now begin at first movement, not at 5 km/h. Your 0–100 time is your real 0–100 time. - Braking tests wait for a confirmed deceleration event, so coasting or lifting off the throttle no longer triggers a false start. - GPS fixes are no longer rejected because velocity is still being computed — the most common cause of "GPS lost" reports on older iPhones. - Routes, CSV and GPX exports no longer contain stuck points or straight-line jumps from tunnels and underground parks. - Zero out the phone-mount offset for accurate motorcycle lean angles. - Send Feedback directly from Settings → About. - Live GPS Diagnostic shows fix quality, accuracy and permissions at a glance. - Imperial units now apply everywhere — Home Screen widget, Live Activity and saved runs. - Long, high-rate sessions no longer freeze Logs, Stats or session detail when opening them. - Performance test attempts no longer create extra entries in your ride history. - Now available in French, Italian and Dutch.

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