Real-time charts
Live speed and G-force graphs up to 25 Hz. Zoom, smoothing, distance or time X-axis — fully tunable.
[ 25 Hz GPS ]
[ km/h · mph ]
[ iOS 18+ ]
[ Apple Watch ]
Track every
acceleration
Turn your iPhone into a pro-grade GPS performance meter. Sprint times, drag runs, full GPS logs — with precision BLE hardware or your phone alone.
Download on the App Store
// free · iOS 18+
[ features ]
Everything a data-driven driver needs.
Precision GPS
Pair a RaceBox logger or a Dragy Lite for up to 25 Hz accuracy, or use your iPhone's internal GPS. Auto-filtering rejects bad samples.
Sprint & drag
0-60 mph, 0-100 km/h, 0-300 km/h, quarter mile, eighth mile, 60 ft — with trap speeds and 1 ft rollout support.
Your specs, your units
Define any custom speed range or distance, pick km/h or mph, meters, feet or miles. The whole app — charts, results, exports — follows your choice.
Apple Watch
Live speed, warmup status and haptic feedback on your wrist. Extended runtime session keeps it awake.
Export & compare
Batch-export CSVs bundled in a ZIP, with weather and environment data. Overlay past runs side-by-side.
Key numbers
25 Hz
Max GPS rate
0-300
km/h range
1/4 mi
Drag distance
∞
Custom specs
[ supported hardware ]
Bring your own GPS. Or just your phone.
RaceBox Mini · Mini S · Micro
25 Hz precision BLE GPS loggers. Pairs in seconds — connect and go. Ideal for serious timing.
25 HzDragy Lite
Fully supported over BLE. Switch the sampling rate between 10, 20 and 25 Hz right inside the app.
10 · 20 · 25 HzInternal GPS
Just your iPhone. No extra hardware, nothing to charge. Perfect for casual runs and quick checks.
1 Hz[ screens ]
Built for numbers you can tune on.
Stop guessing. Start measuring.
Free on the App Store. iOS 18 and up. Apple Watch companion included.
Download on the App Store