Precision Meets Performance
The ultimate open-source vehicle performance timer. 10Hz GPS, Sensor Fusion, and a sleek companion app.
Engineered for Accuracy
Advanced physics computations and hardware integration for the perfect run.
10Hz GPS Telemetry
Parses raw NMEA sentences 10 times per second for pinpoint accuracy.
Sensor Fusion
Combines GPS data with a 20Hz accelerometer to reject multipath spikes and anomalies.
Zero-Crossing Interpolation
Interpolates exact start times down to the millisecond for highly accurate launch timings.
Auto-Armed Launch
Starts recording exactly when you hit 3.0 km/h, bypassing GPS drift automatically.
Fleet Management
Create and manage local profiles for all your vehicles to track performance independently.
Automated Weather
Automatically fetches ambient temperature and humidity for your location using Open-Meteo.
Analytics & Slopes
Interactive charts mapped to your runs showing speed curves, G-force, and elevation slopes.
OLED Design & Wakelock
Stunning dark-mode Flutter app that intelligently keeps your screen on during active runs.
Track Every Milestone
From a standstill to high-speed pulls, OpenDragy covers all your performance testing needs.
- Drag Mode: 60ft, 330ft, 1/8 mile, 1000ft, 1/4 mile, 1/2 mile with trap speeds. (NHRA 1ft rollout and 66ft trap speed supported)
- Metric Runs: 0–100 km/h, 100–200 km/h, 0-200 km/h.
- Imperial Runs: 0–60 mph, 60–130 mph, 0–130 mph.
- Custom Ranges: Define your own speed intervals in any unit.
Open-Source Hardware
Build your own high-precision timer with off-the-shelf components. Our ESP32-S3 firmware handles the heavy lifting.