You can subscribe anytime to unlock the dashboard, saved results, and experiments.
Subscribe to unlock your dashboard, saved results, analytics, and experiments.
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Know how your brain is doing today
Classic cognitive tests you can run in five minutes โ Stroop, 2-back, Flanker, Corsi, and more. Not vague โbrain ageโ games: the same task families used in attention and memory research, playable in your browser.
No account needed to play ยท Subscribe to save results, streaks, and experiments.
What you get
Real tasks, not hype
Stroop, Flanker, Go/No-Go, Digit Span, Trail Making, PVT โ quick probes of attention, inhibition, memory, and speed.
Trends beat one-off scores
A single number on a good or bad day is noise. Save results and watch how sleep, stress, and caffeine show up in your line over weeks.
Test what youโre changing
Trying a new supplement, sleep stack, or focus routine? Run experiments and compare cognitive scores across the protocol.
Who this is for
Built for curious adults โ students and knowledge workers who want a quick focus check, biohackers tracking nootropics or sleep, or anyone who wants an honest mirror on attention and reaction time. Not a clinic; not a diagnosis. Just show up, play fair, and learn something useful.
How it works
- Pick a test or run the Daily Challenge โ four random tasks in about five minutes.
- Play in your browser โ no app install. Most tests take two to five minutes.
- Optionally save scores to build a private history, streaks, and charts on your dashboard.
Try a test โ free, no signup
Daily Challenge
Run four random tests in sequence. Takes about 3โ5 minutes.
Start daily challengeStroop Test
Identify the font color of each word โ not the word itself. Test your inhibitory control.
Play now โ no account neededFlanker Task
Identify the center arrow while ignoring flanking arrows. Tests selective attention and interference.
Play now โ no account neededGo/No-Go Task
Press on Green Circle, withhold on Red Triangle. Tests response inhibition and impulsivity.
Play now โ no account needed2-Back Task
Press when the current letter matches the one from 2 steps ago. Tests continuous working memory.
Play now โ no account neededSymbol-Digit Substitution
Match symbols to numbers using the key. 90 seconds to complete as many as you can. Tests processing speed.
Play now โ no account neededDigit Span Task
Recall sequences of numbers forward or backward. Tests verbal working memory.
Play now โ no account neededCorsi Block-Tapping
Watch blocks light up, then tap them in the same order. Tests visuospatial memory.
Play now โ no account neededTrail Making Test
Connect circles in order as fast as you can. Tests processing speed and task switching.
Play now โ no account neededWisconsin Card Sorting Test
Sort cards by a hidden rule that changes after 10 correct โ tests cognitive flexibility and perseveration.
Play now โ no account neededPsychomotor Vigilance Task
Stop a millisecond counter as fast as you can after random delays โ measures sustained attention, lapses, and false starts.
Play now โ no account neededIowa Gambling Task
Draw 100 cards from four decks โ learn which choices pay off over time. Tests risky decision-making.
Play now โ no account neededTower of London
Rearrange colored balls on three pegs to match the goal โ tests planning and following rules.
Play now โ no account neededWhat is this?
Scientifically-backed cognitive tests to assess attention span, inhibitory control, and reaction speed.
Articles & brain-testing guides
Why take tests for your brain, what games like the Stroop measure, and how to get more from short sessions.
ReadSave your scores. Watch the trend.
Every test is free to play. Subscribe when you want a private dashboard โ saved history, rolling analytics, daily streaks, and experiment tracking. $7.99/month, cancel anytime via Stripe.
Full dashboard
$7.99 / month
- Unlimited saved results and progress history
- Analytics charts, streaks, and community percentiles
- Experiments โ track scores across a supplement or protocol
- All tests stay free; cancel anytime
Sign in or create an account, then complete secure checkout on Stripe.
Dashboard
Pick a game
Experiments
Track cognitive scores while on a supplement or protocol. Baseline uses all results before your start date; the experiment window is from start date through end date (or today if ongoing).
Baseline vs experiment (normalized score)
Complete tests before and after your start date to see comparison bars. Scores use the same scale as your dashboard chart.
Progress & anonymous community
Loading your statsโฆ
Daily streak
Anonymous community rank
Play a few tests this month to see how your averages line up with the anonymous community pool.
Analytics
Loading chartsโฆ
No chartable scores in your saved results yet. Complete at least one test while logged in; more days of data make the rolling average more meaningful.