TrackTimer: Acceleration Test

TrackTimer helps you measure acceleration between speed thresholds on closed courses using your iPhone's GPS and motion sensors.

YOUR RUN JOURNAL
• Follow personal bests, median times and progress in Insights.
• Compare two runs using the same vehicle, speed range and sensor mode.
• Review time differences and available recorded GPS speed traces.
• Add notes and favorites; search and filter your saved runs.
• Export the current result selection as a CSV file. Exports omit location coordinates and vehicle plates.

MEASURE AND COMPARE
• Time 0–100 km/h runs.
• Compare GPS and sensor-fusion results side by side.
• See GPS signal quality and live speed readings.
• PRO unlocks 100–200 km/h and custom speed ranges.

KEEP YOUR RESULTS
Save measurement history, organize results by vehicle and review timing and available speed charts. Automatic saving and raw-speed recording can be managed in Settings. Charts require recorded speed data.

OPTIONAL SHARING
Sign in to share selected results on the public leaderboard. Review your vehicle photo and notes before sharing. Manage your account and account deletion in Settings.

PRO
Optional one-time in-app purchase. Current price and included features are shown before purchase. Restore purchases from the app using the Apple account used for purchase.

CLOSED COURSES ONLY
Set up and secure your phone before driving. Never interact with the device while driving. Use only on race tracks or private areas closed to traffic. Accuracy depends on device, GPS reception, mounting and measurement conditions. TrackTimer does not replace certified timing equipment.

Support: https://mostuned.com/tracktimer/support/
Privacy: https://mostuned.com/tracktimer/privacy/