Free cognitive tests 🧩

No signup, no install, nothing sent to a server. Just open one and start.

Vision & Colour Check

Landolt-C acuity, then Ishihara-style plates where only hue reveals the digit

Full Cognitive Test

Memory, focus, speed, logic and spatial ability in five minutes — as a radar chart

Reaction Time

Five rounds, average in milliseconds, plus how much of it is your hardware

N-back

1, 2 and 3-back working memory, scored so false alarms actually cost you

Stroop Test

Name the ink colour, ignore the word. 30 seconds of inhibitory control

Corsi Block Test

Watch the sequence, tap it back. The standard measure of visuospatial memory span

Mental Rotation

Rotation or mirror image? Every pair is guaranteed chiral, so silhouette will not save you

Memory Match

Concentration, scored for wasted flips as well as speed

Quick Math

Timed arithmetic where wrong answers subtract, so guessing costs you

Colour Spotting

One tile differs, and the difference shrinks every level

Number Merge

2048-style planning under forced randomness, with the corner strategy explained

Big Five Personality Test

The five-factor model researchers actually use, with reverse-scored items so agreeing with everything does not inflate your profile

Career Interest Test (RIASEC)

Holland's six vocational types and your three-letter code. Interest is not ability, and we say so

Ball Weight Ordering

Sort identical-looking balls by weight, with a weighing budget set at the theoretical minimum

Tower of Hanoi

Scored against the 2ⁿ−1 minimum, with a mechanical rule that solves it without planning

Task Switching

Position decides which rule applies. Measures the switch cost that makes multitasking expensive

Quantity Comparison

Which side has more? Dot sizes are jittered so judging by area will not work

Rock Paper Scissors Reflex

Win, lose or draw on command. Losing on purpose is the hard part

Balloon Risk Task (BART)

Pump for points, bank before it bursts. A standard behavioural measure of risk-taking

Iowa Gambling Task

Four decks, 24 draws. You will start avoiding the bad ones before you can say why

Potion Brewing

Work out the hidden rule from red/blue feedback. Testing to confirm gets you nowhere

Number Pressing

Tap 1-9 in the order the rule demands — and the rule keeps changing

Finding Common Ground

Three people, five seconds, one thing they all agree on

Pipe Path Puzzle

Rotate tiles to connect both sides. Propagate the forced tiles before you guess

Whack-a-Mole

Hit moles, avoid bombs. A go/no-go inhibition task in an arcade costume

Snake

The difficulty is space, not speed — the maze is one you built yourself

Brick Breaker

Where the ball hits the paddle sets its angle. That is the entire game

Reading

Eight cognitive tests, explained

What Stroop, N-back, Corsi, BART and four more actually measure, and where each came from

Does brain training actually work?

Near vs far transfer, what happened with N-back, the 11,000-person trial, and what does help

How to improve your memory

Five techniques ordered by evidence — and why highlighting does almost nothing

How to improve your focus

Sleep, multitasking and the phone-in-the-room effect, separated from the advice that just sounds right

What this is

A small collection of classic cognitive tasks — the same paradigms used in psychology labs — rebuilt to run in a browser without an account. Reaction time, N-back, Stroop, a spatial span task, mental rotation, and an Ishihara-style colour check.

Everything is free. There is no signup, no install, and your results are stored in your browser only (localStorage) — nothing is sent to a server unless you choose to submit a score to a leaderboard. The site is funded by ads.

What it is not

Worth being direct about this, because a lot of sites in this space are not.

It is not an IQ test and does not produce one. Five short browser tasks cannot substitute for a standardised battery administered under controlled conditions.
It cannot diagnose anything. Not attention disorders, not colour blindness, not visual acuity. If you have a concern, see a professional.
It will not make you smarter. The evidence for far transfer from brain training is much weaker than the marketing suggests — we say so plainly on the N-back page. What you reliably gain is familiarity with the task format, which is genuinely worth something when you meet these tasks in a test.

What it is good for: seeing your own relative strengths, and watching how sleep and fatigue move your own numbers. Those effects are large and easy to observe.

A note on measurement

Browser-based measurement has real limits and we would rather name them than paper over them.

Reaction time includes your hardware. A 60Hz display adds up to 16ms before the stimulus is even visible, and touch panels add more. Compare your own device to itself, not to a stranger.
Vision cannot be scored as 20/20. Screen size and viewing distance are unknown to the page, so the check reports stages cleared rather than inventing a figure.
No percentiles yet. Ranking you against others requires a large sample; with a small one the number swings every time someone new arrives. When there is enough data, we will turn it on.

About the rest of the site

CogPop began as a Korean-language site. All 27 games and tests are now fully available in English — the pages above. What remains Korean-only is the job-application material: an aptitude mock exam and a typing test whose questions are Korean text, and a set of guides written for the Korean graduate hiring market. The four cognitive-science guides above are in English. None of it would be useful translated.

The Korean site has those as well, if you read Korean.