Home/GPS Lap Timer
Turn your iPhone into a GPS lap timer
You drive.
ST1 Track handles the timing.
ST1 Track is an iPhone GPS lap timer app built for cars, motorcycles and karting. It automatically detects your laps, records your times and gives you the tools to analyze sectors, speed and braking zones after the session.
No need to tap a stopwatch every time you cross the line.
Pick the track.
Start the session.
Drive.
Available on iPhone. Android is coming soon.
Lap timing that lets you focus on the track
Your attention belongs on the track.
Not on a button.
Once your session is running, ST1 Track detects your laps and records your times automatically. Your sessions stay available afterward so you can review what happened and follow your progress.
Automatic lap detection
Start the session and let ST1 Track record your laps as you drive.
Session history
Keep your sessions and lap times together instead of losing your progress between screenshots and notes.
Sector analysis
Break the lap into sections and see where you gain time and where there is still more to find.
Speed and braking zones
Go beyond the final lap time by reviewing speed information and braking zones from your session.
A lap time does not tell the whole story
A personal best tells you that you were faster.
It does not automatically tell you why.
That is why ST1 Track goes beyond the stopwatch.
Sectors, speed, braking zones and session history give the lap more context and help you understand what changed.
For cars, motorcycles and karting
ST1 Track is not built for one vehicle category.
Use it during a car track day, a motorcycle session or karting.
The machine changes.
The objective remains familiar:
understand the next lap better than the last one.
Discover and create tracks
ST1 Track can also help before the timer starts.
Discover tracks available in the app and choose where you want to drive.
If a layout is missing, ST1 Track also allows new tracks to be created.
Put your lap in context
Track leaderboards give your time another reference point.
Instead of keeping the lap as an isolated number, you can connect the performance to the track, your vehicle and your session history.
FAQ
What is a GPS lap timer app?
A GPS lap timer app uses your phone during a track session to detect laps and record lap times. ST1 Track also adds sector, speed and braking analysis so the session can be reviewed afterward.
Can I time track laps with an iPhone?
Yes. ST1 Track uses the iPhone during the session to detect and record laps, allowing you to start timing without immediately purchasing dedicated lap-timing hardware.
Can I use ST1 Track for a car track day?
Yes. ST1 Track is designed for track sessions with cars and can record laps, sessions and performance information.
Does ST1 Track work for motorcycles and karting?
Yes. ST1 Track can also be used for motorcycle and karting sessions.
Can ST1 Track analyze sector times?
Yes. ST1 Track includes sector analysis as well as additional information such as speed and braking zones.
Does ST1 Track replace professional motorsport telemetry?
No. Dedicated equipment remains valuable when you need specialized GPS hardware, external sensors, a dedicated IMU or ECU data. ST1 Track is designed to make lap timing and analysis accessible with the iPhone you already carry.
Your next lap time is already in your pocket.
Pick the track. Start the session. Drive. Analyze. Repeat.