Harry's Dyno 4+

Harald Schlangmann

    • 1.0 • 2 Ratings
    • $3.99

iPhone Screenshots


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

What’s New

Version 24.9.0

- fixed a bug in gear calculation
- replaced deprecated acceleration framework
- added support for Vgate vLinker FD+/MC+/BM+ OBD adapters
- fixed and improved VBO import
- rechecked Racebox integration to deliver high update rates

Ratings and Reviews

1.0 out of 5
2 Ratings

2 Ratings

Crazybutt44 ,

Crashes immediately everytime

After the last update. The app crashes everytime immediately upon opening. This is on a ipad 7. So not like it's because it's on a outdated ipad.

chanks486 ,

Crashes on startup

This needs to get fixed. The app is rendered completely non functional.

App Privacy

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, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

Harry's LapTimer Petrolhead
Harry's LapTimer Rookie
Harry's LapTimer Grand Prix
Harry's GPS/OBD Buddy
Harry's Sailor
Harry's Camper

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