SpeedBox Performance Tracking vs Harry's Dyno

How fast is your car, really? SpeedBox times acceleration runs like 0–60 mph or the quarter mile, automatically via GPS and with nothing but your iPhone. Tap start, drive off, done: Timing begins on its own as soon as you pull away and stops at the finish. No stopwatch, no passenger needed. You keep your full attention on driving. WHAT YOU GET • Hard numbers instead of gut feeling: real performance data for your car • Compare before and after, following a tune, new tyres or a software update • Several runs back to back without resetting anything, ideal for track days and club racing • Every result saved, with date, distance, elevation change and slope • Compete with drivers worldwide: your best times go to the Game Center leaderboards • A fraction of the price of professional GPS timing devices NEW IN VERSION 3 • New measuring screen with a large gauge, easy to read in a mount, in landscape too • Live comparison: while you drive, you see whether you're ahead of or behind your personal best • A speed curve for every run, and two runs side by side • Your route on a map • More times from every run, such as 0–30 mph or the 1/8 mile, plus acceleration in g if you want it • Video with your numbers: every run is saved to Photos as a clip with speed, time and result • Weather for every run: temperature, air pressure and density altitude • Speed and time on the Lock Screen, in the Dynamic Island and in CarPlay MEASUREMENTS • The classics: 0–60 mph, 30–70 mph, 60–100 mph, 0–100 km/h and many more • Distances: 150 m, 1/8 mile, quarter mile, 1/2 mile and 1 mile • Special modes: drag race, Rolling 50 and top speed • Choose mph or km/h • Favorites and recently used modes always at hand COMFORT • Start countdown and sound signals at the start and finish • Two designs: Track (dark, for your mount) and Classic (light) • Slope compensation: fair, comparable results even uphill or downhill • Apple Watch: status, speed, time and result at a glance, start and stop timing right from your wrist • Adapts automatically to your iPhone's light or dark appearance • VoiceOver announces the start and the result EVEN MORE PRECISE An external 10 Hz Bluetooth GPS receiver makes timing considerably more accurate. SpeedBox supports the XGPS160. HOW IT WORKS 1. Check GPS reception (top right, e.g. "GPS ±16 ft") 2. Choose a mode at the top left, e.g. 0–60 mph 3. Tap "Start measurement" 4. Drive off, SpeedBox times you automatically Questions, ideas or requests for more modes? Write to support@speedboxapp.de or visit us on Instagram: @speedboxapp Please don't use this app on public roads, only on closed race tracks! Note: Continued use of GPS running in the background can dramatically decrease battery life.

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