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Know how your brain is doing today

Research-grade cognitive tests in five minutes. Stroop, 2-back, Flanker, and more, playable in your browser.

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No account needed to play. Subscribe to save results, streaks, and experiments.

Real tasks, not hype

Stroop, Flanker, Go/No-Go, Digit Span, Trail Making, PVT. 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 over weeks.

Test what you are changing

Trying a new supplement, sleep stack, or focus routine? Run experiments and compare cognitive scores across the protocol.

Built for curious adults who want a quick focus check: students, knowledge workers, and anyone tracking sleep or supplements. Not a clinic and not a diagnosis. Show up, play fair, and learn something useful.

How it works

Pick a test Run the Daily Challenge for four random tasks in about five minutes, or open any test directly.
Play in your browser No app install. Most tests take two to five minutes.
Save scores optionally Build a private history with streaks and charts on your dashboard.

By cognitive construct

Attention and inhibition

Stroop, Flanker, Go/No-Go, and PVT for filtering, stopping, and vigilance.

Working memory

2-back, digit span, and Corsi for verbal and visuospatial span.

Try a test, free, no signup

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Daily Challenge

Run four random tests in sequence. Takes about 3-5 minutes.

Start daily challenge
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Brain Care Score

Mass General Brigham's 21-point lifestyle snapshot: what it measures and how it differs from task tests here.

Read guide
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Stroop Test

Identify the font color of each word, not the word itself. Test your inhibitory control.

Play free
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Flanker Task

Identify the center arrow while ignoring flanking arrows. Tests selective attention and interference.

Play free
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Go/No-Go Task

Press on Green Circle, withhold on Red Triangle. Tests response inhibition and impulsivity.

Play free
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2-Back Task

Press when the current letter matches the one from 2 steps ago. Tests continuous working memory.

Play free
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Symbol-Digit Substitution

Match symbols to numbers using the key. 90 seconds to complete as many as you can. Tests processing speed.

Play free
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Digit Span Task

Recall sequences of numbers forward or backward. Tests verbal working memory.

Play free
⬛

Corsi Block-Tapping

Watch blocks light up, then tap them in the same order. Tests visuospatial memory.

Play free
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Trail Making Test

Connect circles in order as fast as you can. Tests processing speed and task switching.

Play free
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Wisconsin Card Sorting Test

Sort cards by a hidden rule that changes after 10 correct. Tests cognitive flexibility and perseveration.

Play free
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Psychomotor Vigilance Task

Stop a millisecond counter as fast as you can after random delays. Measures sustained attention, lapses, and false starts.

Play free
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Iowa Gambling Task

Draw 100 cards from four decks and learn which choices pay off over time. Tests risky decision-making.

Play free
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Tower of London

Rearrange colored balls on three pegs to match the goal. Tests planning and following rules.

Play free
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What is this?

Scientifically-backed cognitive tests to assess attention span, inhibitory control, and reaction speed.

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Articles & brain-testing guides

Why take tests for your brain, what games like the Stroop measure, and how to get more from short sessions.

Read

Save your scores. Watch the trend.

Every test is free to play. Subscribe when you want a private dashboard — 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 — track scores across a supplement or protocol
  • All tests stay free; cancel anytime

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