Quick answers to common questions. If you don't see your issue here, email contact@d4enterprises.com and I'll help directly.
Set up a session. Open the app and add the cars you want to time. Give each car a name (or number — whatever works for your event). Tap "Start" to enter the timer view.
Time the cars. Each car has its own card with start/lap/stop controls. Tap to start a car's timer when it crosses the line, tap "Lap" to record a lap, tap "Stop" when it's done.
Review results. Tap "Results" to see lap times sorted by best, average, or order. Tap "History" to pull up a past session.
iOS auto-locks the screen by default. Open Settings → Display & Brightness → Auto-Lock and set to "Never" while you're running an event. Remember to turn it back when you're done so the battery doesn't drain in your pocket.
Open the car's lap list and swipe to delete the bad lap. Best/average times will recalculate automatically.
Yes — tap the car name on its card to edit it. The change applies to the current session and is saved with the history.
Yes. The app is fully offline. Nothing is uploaded to a server.
Timing precision matches Apple's high-resolution clock — accurate to milliseconds. The limiting factor is your reaction time on the start/lap button, the same as any handheld stopwatch.
All session data stays on your device. Read the full privacy policy for details.
Send an email to contact@d4enterprises.com. Please include your iPhone model, iOS version, and a description of what happened.