Free 0-60 Timer App for iPhone — GPS Car Acceleration Test
Last reviewed: · FastTrack Engineering
Bottom line. FastTrack times your 0-60, 0-100, quarter-mile, and rolling-start runs using iPhone GPS and the internal accelerometer, accurate to within ±0.02 seconds on a clear-sky run. Launch detection averages ~30 ms — three times faster than a GPS-only device. No subscription, no hardware to buy.
FastTrack is a free GPS acceleration timer app for iPhone that measures your car's 0-60 mph, 0-100 mph, quarter mile, and half mile times with precision comparable to dedicated devices like Dragy and RaceBox. No extra hardware needed — just your phone and an open road.
Where the numbers come from
- 0-60 mph accuracy
- ±0.02 seconds — inside the accuracy window of a standard Dragy and within hundredths of flagship hardware like the Dragy Pro and RaceBox Mini.
- Launch detection
- ~30 ms average — roughly three times faster than typical GPS-only devices (~100 ms), because motion is detected before GPS can update.
- Extra hardware
- None. Runs entirely on the iPhone you already own — no external GPS dongles, no Bluetooth pairing, no extra battery to manage.
- Cost
- Free. All four timing modes, leaderboards, mod tracking, and community features included — no subscription tier.
Full methodology, test protocol, and error sources: /accuracy
Acceleration Timing Features
- 0-60 mph timing — GPS Doppler speed with 100Hz accelerometer launch detection (~30ms, faster than Dragy's ~100ms)
- 0-100 mph measurement — Full acceleration curve from standstill to triple-digit speeds
- Quarter mile time and trap speed — Distance-based timing with GPS position tracking
- Half mile timing — Extended distance runs for high-speed vehicles
- Rolling start timing — Measure acceleration from any starting speed (60-130, 40-80, custom ranges)
- Real-time speed graph — Live acceleration curve displayed during and after each run
- Run history and personal bests — Every run is saved with conditions, vehicle, and current modification list
How FastTrack Compares to Dragy and RaceBox
FastTrack achieves 0-60 accuracy within ±0.02 seconds of the Dragy standard and RaceBox Mini by combining GPS Doppler-derived speed with accelerometer-based launch detection and an Apollo 11–class sensor-fusion pipeline. The 100Hz accelerometer detects acceleration onset in approximately 30 milliseconds, which is genuinely faster than the standard Dragy's GPS-only launch detection (~100ms latency). For most enthusiasts, FastTrack provides the accuracy they need without spending $150 to $500 on dedicated hardware.
More Than Just a Timer
Unlike standalone timing tools, FastTrack connects your performance data to a complete car enthusiast platform. Every run is linked to your vehicle garage and modification list, so you can measure the real impact of each mod. Share your runs on the community feed, see how you rank on global leaderboards, and connect with other owners of your platform.
Download FastTrack Free on the App Store
Guide: How to Measure Your 0-60 Time Accurately | Guide: How Accurate Are Phone GPS Timer Apps?
Frequently Asked Questions
How accurate is FastTrack compared to a Dragy or RaceBox?
FastTrack produces 0-60 times within ±0.02 to ±0.04 seconds and quarter-mile ETs within ±0.04 to ±0.06 seconds — inside the accuracy range of a standard Dragy and within hundredths of flagship hardware like the Dragy Pro and RaceBox. It fuses GPS Doppler velocity with the iPhone's 100Hz accelerometer using the same class of sensor-fusion math used on Apollo 11 and in modern autonomous vehicles, with launch detection around 30ms.
Do I need any extra hardware to time my car?
No. FastTrack runs entirely on your iPhone's built-in GPS and accelerometer. No OBD-II adapters, Bluetooth devices, or external sensors are required.
What is the difference between Acceleration Mode and Drive Mode?
Acceleration Mode is built for single timed runs like 0-60 or quarter-mile with automatic launch detection and auto-stop. Drive Mode records your entire drive in the background, logging route, top speed, and performance events. Rolling Mode adds rolling-start tests from 60 mph and up.
Is FastTrack free?
Yes. FastTrack is completely free to download and use. All four timing modes, all metrics, and all community features are included at no cost.