G-Box Dyno
Power, Torque & Acceleration
Only for iPhone
Free · In‑App Purchases
iPhone
Measure acceleration, estimate power and torque, compare runs, and add synchronized telemetry to driving videos using iPhone, OBD-II or an external GPS receiver.
G-Box Dyno turns your iPhone into a focused vehicle-performance measurement tool.
Measure 0-60, 0-100, 0-160, 0-200, 80-120 and 100-200 acceleration. Run a single-gear Dyno pull to estimate power and torque, save high-rate telemetry, and compare repeat runs on clear graphs.
CHOOSE THE BEST SENSOR SOURCE
Use iPhone GPS and motion sensors, a compatible Bluetooth or Wi-Fi OBD-II adapter, or an external GPS receiver. G-Box Dyno automatically prioritizes a connected high-rate source and records source quality with every run.
BUILT FOR REPEATABLE TESTING
- Vehicle profiles with mass and gear calibration
- Power and torque curves versus engine RPM
- Automatic shift detection and useful run trimming
- Atmospheric data for consistent comparisons
- CSV telemetry and saved run history
- Portrait and landscape analysis views
- Optional rear-camera video with synchronized acceleration overlays
FREE TO START
Create one vehicle and complete three measurements with the standard 0-60 and 0-100 presets. Upgrade once to G-Box Dyno Pro for unlimited measurements, vehicles, advanced acceleration ranges, comparisons and video overlays. No subscription. No ads.
SAFETY AND MEASUREMENT NOTICE
Use only on a closed course or private road where legal. Configure the app while parked, mount iPhone securely, and never interact with the screen while driving. Performance results are estimates and are not certified dynamometer measurements. Accuracy depends on sensor quality, calibration, vehicle data, road grade, traction and weather.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Added popular metric and imperial acceleration presets, including distance runs with intermediate splits and trap speeds. Improved iPhone GPS/IMU speed estimation and acceleration timing, added intermediate 0–60 results to 0–100 runs and video overlays, and improved run video completion, audio, and results layout.
The developer, RaceMeasure LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RaceMeasure LLC
- Size
- 45.2 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
English and 3 more
- English, French, German, Russian
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- G-Box Dyno Pro $9.99
- Copyright
- © 2026 RaceMeasure LLC