Harry's Dyno is a high precision performance measuring app. It utilizes GPS and OBD sensor input to recognize arbitrary speed ranges like 0-60 mph or 100-200 km/h. Both acceleration and deceleration testing is supported.
Results can be compared and analyzed in details. Using two-cursor mode, one can inspect subranges of data recorded (e.g. 80 to 120 km/h for a 0 to 200 km/h). Data is stored locally and can be filtered by speed range and vehicle used. It can be exported to various data formats too.
Provided the smartphone is mounted in a position with good GPS accuracy, the internal GPS can be used for measurements. For short speed ranges, high powered vehicles, and highest precision, either external GPS or OBD sensors can be connected. OBD adapters are actually preferable as speed changes are available instantly. We have an always up to date list of compatible accessories available here: www.gps-laptimer.de/compatibility/ios
For distance based performance testing (quarter mile etc), please use Harry's LapTimer currently. This mode will be added to Harry's Dyno as a free upgrade shortly.
For Harry's LapTimer users! Harry's LapTimer GrandPrix has received a free feature upgrade and includes Harry's Dyno functionality now: please follow LapTimer ‣ Race ‣ Performance to use the dyno mode. In case you have used Harry's LapTimer Petrolhead so far, you may either upgrade it to GrandPrix (LapTimer ‣ Administration ‣ Add-ons), or go for Harry's Dyno as a separate app.
Enjoy and let us know what you think! For questions, tipps & tricks, and support, please use our forum www.gps-laptimer-forum.de
Ratings & Reviews
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User Interface
- Added full support for the new iPhone Duo—both the outer screen and the huge inner screen
- Modernized the front end to match the iOS 26/27 style
- Reworked tile configuration and display options for various screen sizes
- Improved dozens of icons, spacing, colors, and layouts
Sensors
- Made all pro sensor support available
- Improved OBD result parsing
Data
- Modernized and expanded VBO imports for better compatibility with third-party apps
- Added automatic date recognition for VBO and NMEA imports
Plus hundreds of smaller improvements and fixes
Version 26.0.0
The developer, Harald Schlangmann, 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 Collected
The developer does not collect any data from this app.
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Size
41.4 MB
Category
Sports
Compatibility
Requires iOS 15.0 or later.
iPhone Requires iOS 15.0 or later.
iPod touch Requires iOS 15.0 or later.
Languages
English and 7 more
English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Traditional Chinese
