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Harry's Dyno

by Harald Schlangmann more by this developer →

#484,468 of 718,701 by ratings on Apple · #13,422 of 20,382 in Sports

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Category: Sports

Description

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

Alternatives to Harry's Dyno

Name	Ratings	Rating
Harry's LapTimer Petrolhead by Harald Schlangmann	153	3.8	compare
Harry's LapTimer Grand Prix by Harald Schlangmann	80	4.0	compare
Harry's LapTimer Rookie by Harald Schlangmann	36	3.3	compare
PerfExpert - Car Dyno HP Test by Claude JOSEPH ANGELIQUE	12	3.7	compare
Log Dyno by Adam Keninger	10	3.4	compare
Dyno Chart - OBD II Engine Performance Tool by K SOLUTION LLC	6	1.2	compare
Dynometry 0-60 & 0-100 test by Mykola Rudenko	3	3.0	compare
Harry's Sailor by Harald Schlangmann	1	5.0	compare
Harry Hurst Roadrunners by Ballfrog East LLC	—	—	compare
CricDyno – Live Cricket Score by Mahmood Ahmad	—	—	compare

Growth

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History

Tracking since 09/05/2026. History accumulates as changes are observed — check back soon.