Lights Out Live

Race the real start. Point your phone at the TV, then tap the moment the actual race lights go out.

Next race start–
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  1. Position your phone in front of the TV so the camera can see the screen. Closer is better — the start lights should be big in the picture.
  2. Line the start lights up inside the box on screen and hold the phone steady until it says "Locked on" — ideally before the first light comes on. You can draw your own box instead if you prefer.
  3. Watch the TV, not your phone. When the lights go out, tap anywhere on the phone screen. Tap early and it's a jump start.
Why it's fair: the phone sees exactly the same picture you do, so your TV, stream or satellite delay cancels out. You're timed against the lights as they appear on your screen.
No race on? Open Practice gantry on a laptop or second screen, turn on Loop, and point the phone at it to rehearse the setup.
Leaderboards: every Grand Prix and Sprint gets its own board, and your finishing position on each one scores F1-style points towards a season championship. Only live starts count. Create a private league to race your friends.
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Fit the start lights inside this box
Starting camera…
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Waiting for the lights…
Reaction
0.000s
Tap to start the sequence

Settings

Go higher if the lights are small or dim in the camera picture; lower if it triggers on things that aren't the lights.

Only used when your browser doesn't report exact camera timestamps.