Cognitive Tests & Brain Games
These games measure and train six different cognitive skills. Each test has a personal best tracker and global average so you can see exactly where you stand. Play daily to build a streak and watch your scores improve. All scores stay in your browser — nothing is ever sent to a server.
What Brain Games Train
Brain games target measurable cognitive functions rather than general cleverness. Reaction tests measure processing speed, memory tests measure how much you can hold and for how long, and the Stroop test measures your ability to suppress an automatic response. Each one produces a number, which is what makes progress visible.
Be careful with the bigger claims. A 2016 review in Psychological Science in the Public Interest by Simons and colleagues found little evidence that training of this kind makes people generally smarter. You get better at the thing you practise. The NIH-funded ACTIVE trial of 2,832 older adults found the same shape of result: real, durable, and specific.
That still leaves them useful. Students get a short focused reset between study blocks, office workers get a break that is not a scroll through social media, and older adults get a way to notice changes in their own attention over time.
Because these run in the browser, there is no install and no account. You can take a five minute test on a work laptop without asking anyone's permission.
Reaction Time
How fast can you respond to a visual stimulus? Measures simple reaction speed. Five rounds, averaged.
Number Memory
See how many digits you can hold in short-term memory. The number flashes briefly, then you type it back.
Aim Trainer
Click 30 circular targets as quickly as you can. Tracks average time per target. Best on desktop.
Sequence Memory
A 3×3 grid lights up in sequence. Watch, then repeat. Gets longer every level.
Math Sprint
How many arithmetic questions can you answer correctly in 60 seconds? Difficulty scales with your score.
Stroop Test
Click the colour of the ink, not what the word says. Classic cognitive interference test from 1935.
Visual Memory
Remember which squares flash on a grid. Grows larger and harder each level.
Typing Speed
Type as many words as you can in 60 seconds. Live WPM counter.
Chimp Test
Numbers flash on a grid then disappear. Click them in order. Chimpanzees beat most humans at this.
What This Section Contains
Nine short tests sit here, each measuring one cognitive domain rather than trying to train them all. Reaction time and aim trainer measure response speed and visuomotor accuracy. Number memory, visual memory and sequence memory each load a different form of working memory. The chimp test measures spatial recall under increasing load, math sprint measures arithmetic fluency under time pressure, stroop test measures inhibition, and typing speed measures motor fluency.
They work best as a benchmark you return to rather than a one off. Taking the same three tests weekly gives you a personal baseline, which is more informative than a single score compared against strangers. research indexed by the National Library of Medicine discusses how a short regular routine is built and why consistency matters more than session length.
Frequently Asked Questions
What do these tests actually measure?
Each targets one domain: response speed, working memory, inhibition, arithmetic fluency or motor speed. They are deliberately narrow, which is what makes a score interpretable.
Are these an IQ test?
No. They measure specific processing abilities under controlled conditions. Nothing here produces a general intelligence estimate and no single score should be read that way.
How often should I take them?
Weekly is enough to see a trend without the score being dominated by daily variation in sleep and alertness. A personal baseline is more useful than comparison with other people.
Why does my score vary so much day to day?
Sleep, caffeine, time of day and screen input lag all move these scores measurably. That is why a trend across several sessions is more reliable than any single result.
Will practising these improve my thinking generally?
Mostly it improves performance on the practised task. Cognitive training research finds transfer to unrelated abilities is real but modest, so treat improvement as domain specific.