Guide library

F1 reaction guides

ReactionF1 is a free lights-out reaction tool. These guides explain the score you just got — timing methods, device lag, start-light rules, and how to practice without turning every attempt into a jump start.

Prefer the method notes first? Read how we measure reaction time.

How timing works

What a millisecond score actually means — simple vs choice, senses, and how this browser tool clocks lights out.

Devices & lag

Phones, mice, touchscreens, and refresh rates all add noise. Same reflexes can look slower on a different setup.

F1 starts

Five lights, a random wait, then go. Learn the sequence, false starts, and the line between reacting and guessing.

Practice plans

Short plans that keep you honest: warm-ups, clean attempts only, and progress you can trust week to week.

Scores & averages

Human averages, age bands, F1-style ranges, and what “good” looks like on a lights-out test.