Classic
React to the change
The screen holds, then flips. The instant it changes, tap. Go early and it's a fault. Pure stimulus and response.
Scored in milliseconds
Live on Google Play
How fast is
your brain?
Four reaction modes, scored to the millisecond. Train your reflexes, your focus, and your timing — then see where you land on the global board.
Go on — it's playable.
Four modes
Four ways to test your brain.
Each mode targets a different system — raw reaction, motor speed, impulse control, and visual-motor timing. Every one strips the screen back to just you and the number.
Rapid Fire
Tap as fast as you can
Three seconds on the clock. Hammer the screen and hold your rhythm. Your finger is the bottleneck.
Most taps in 3 seconds
Stroop
Tap only on a match
The word names a color; the ink is another. Tap when the word and the ink agree — and sit on your hands when they don't.
Focus & impulse control
Phantom Ring
Match it from memory
A ring flashes once, then vanishes. Another swells up from the center — tap the instant it matches the size you memorized. Scored to the pixel.
Error in pixels
Scoring
Every mode ranks you on a tier.
Pick a mode. Each one drops your score onto its own scale — here's every tier, and what it takes to reach it.
Tier
Percentile
Superhuman≤150 ms
Top 1%
Insane151–180 ms
Top 5%
Elite181–200 ms
Top 10%
Excellent201–225 ms
Top 15%
Great226–250 ms
Top 30%
Sharp251–275 ms
Top 40%
Average276–300 ms
Top 50%
Steady301–350 ms
Top 70%
Slow351–400 ms
Top 85%
Still Waking Up400 ms+
—
Under 200 ms is genuinely fast — most adults start around 250 ms and find another 20–30 ms once they stop guessing and start reacting. The percentiles are ReflexLab's own fixed estimates, set against published reaction-time ranges to give each tier a sense of scale. They're a yardstick, not a live measurement of everyone playing.
Beyond the score
Reasons to keep coming back.
One run tells you today's number. The rest of the app tells you whether you're actually getting faster.
Global leaderboards
This weekResets Monday
1SWIFT_EDGE_204148 ms
2ZEN_WAVE_871156 ms
3CORE_MIND_339163 ms
28you247 ms
A global board for every mode, and they all reset every Monday — so the ladder's never out of reach. Post a time and see exactly where you land this week.
90-day heatmap
Every day you play lights up a square — your last 90 at a glance.
lessmore
Daily streak
12 days
A fresh challenge every day. Miss one and the count resets. That's the point.
Per-session analytics
198best ms
243avg ms
412sessions
Best, average, and every attempt, broken down. Share the card whenever you beat your record.
4reaction modes
26skill tiers
5.0★on Google Play
150+downloads and climbing
Free to play, works offline, and no account needed to start.
Questions
The usual questions.
What counts as a good reaction time?
The average adult sits around 250ms. Under 200ms is fast, and under 150ms is the range pro players chase. ReflexLab scores every Classic tap across ten tiers, from Superhuman down to Still Waking Up, each with its own percentile.
Is ReflexLab free?
Yes. It's free on Android and supported by the odd ad. All four modes are unlocked from the first launch, and nothing sits behind a paywall.
What do the four modes test?
Different parts of the same machine. Classic measures raw reaction time, Rapid Fire measures motor speed, Stroop pressures your focus and impulse control, and Phantom Ring tests how precisely you can time a tap.
How does ranking work?
Each mode keeps its own global leaderboard that resets every Monday. Classic results also get a tier and a percentile, so you can see your rank for the week alongside roughly where you fall among everyone who plays.
Do I need an account or internet?
No account to start, and the modes play fine offline. You'll want a connection for the leaderboards, the daily challenge, and syncing your history across the day.
Find out how fast
you really are.
Four modes, one number that won't flatter you. It's free, it's on Android, and the first run takes about ten seconds.
Free on Android · works offline · no account to start