About ReactionF1

What is F1 Start Reaction?

F1 Start Reaction is a free browser-based game that simulates the intense moment of a Formula 1 race start. When the five red lights go out, drivers must react instantly to launch off the grid. This game lets you experience that same adrenaline rush and measure your reaction time in milliseconds.

Built as a passion project by F1 fans, this game captures the essence of what makes race starts so thrilling. Whether you're a casual viewer or a die-hard motorsport enthusiast, you can now put your reflexes to the test and see how you compare to the professionals.

Who We Are

ReactionF1 is an independent project built by F1 fans and web developers. We're not affiliated with Formula One, the FIA, or any team. We built this because we love race starts—the tension of the five lights, the split-second reaction—and wanted a free, accurate way for anyone to test their reflexes.

This is a fan-made project. We are not affiliated with Formula One Group, FIA, or any F1 team. All Formula 1 trademarks belong to their respective owners. This site is for entertainment and education only.

We use performance.now() for millisecond-precision timing. Device latency affects results—see our device latency guide for details. Your data stays on your device.

Questions or feedback? Contact us—we read every message.

How It Works

The game faithfully recreates the official F1 start procedure:

1. Tap to begin - Press the start button or tap anywhere on the screen to initiate the sequence.
2. Watch the lights - Five red lights illuminate one by one, each 350 milliseconds apart, just like on a real F1 starting gantry.
3. Stay focused - After all five lights are on, there's a random delay between 1 and 3.5 seconds. This unpredictability is what makes F1 starts so challenging.
4. Lights out! - When the lights go out, tap as fast as you can. Your reaction time is measured from the exact moment the lights extinguish.
5. Get your result - See your reaction time, earn a rating, and track your personal best.

Tap too early and you'll get a false start - just like in a real race where jumping the lights means a penalty!

What is a Good Reaction Time?

Professional F1 drivers typically react in 150-250 milliseconds. The best starts in history have been around 100-150ms. Here's how we rate your performance:

Why We Built This

Every F1 fan knows the tension of a race start. The formation lap, the drivers lining up, the five lights counting down - it's one of the most exciting moments in motorsport. We wanted to capture that feeling and let anyone experience it, anytime, anywhere.

This game is completely free, works on any device with a browser, and requires no downloads or sign-ups. Your stats are saved locally on your device, so you can track your improvement over time and challenge your friends to beat your best time.