Free Brain Tests
Benchmark your mind: reaction time, typing speed, number and visual memory, verbal recall, plus a full adaptive IQ test — all scored against published population norms.
10 free brain & cognition tools
- IQ Test — Adaptive, IRT-scored full-scale IQ battery
- Brain Fog Test — Objective Brain Fog Index from 10 timed tasks
- Reaction Time Test — Measure your visual reaction speed
- Typing Speed Test — WPM, accuracy and consistency
- Number Memory Test — How many digits can you hold?
- Sequence Memory Test — Repeat the growing pattern
- Visual Memory Test — Remember the lit squares
- Verbal Memory Test — Seen it before, or is it new?
- Chimp Test — Beat the chimpanzee benchmark
- Aim Trainer — Hit 30 targets, timed to the ms
About these tools
There is a large gap between the cognitive tests used in research and the ones available to the public. Research instruments report reaction times in milliseconds with outlier handling and normative z-scores; public quizzes report “You are a genius!”. These tests aim squarely at the first category while staying free and taking minutes rather than hours.
Every task here is an implementation of a published paradigm — the Psychomotor Vigilance Task, the Stroop colour–word test, n-back working memory, the Trail Making Test, Corsi block span, Go/No-Go inhibition — timed against the browser’s high-resolution clock and scored against published population norms rather than an invented scale. Where display latency matters, results are reported with that caveat rather than pretending a web page is a lab.
The two flagship assessments go further: the IQ test uses adaptive item selection driven by a 2-parameter logistic item response model, and the Brain Fog Test combines objective task performance with symptom reporting into a single trackable index. Both keep every result in your own browser so you can watch trends over weeks without handing your cognitive data to anyone.
Frequently asked questions
Are these brain tests scientifically valid?
They implement well-established experimental paradigms and score against published norms, which makes them genuinely informative for self-tracking and comparison. They are not clinical instruments and cannot diagnose any condition — administration conditions in a browser are less controlled than in a lab.
Does display lag affect reaction time results?
Slightly. Monitor refresh rate and input latency add a roughly constant offset, typically 15–40 ms. Because the offset is consistent for your setup, comparisons across your own sessions remain reliable even if the absolute number is a touch high.
Are my results private?
Yes. Scores are saved only in your browser’s local storage. Nothing is uploaded, and clearing your browser data clears your history.
How often should I retest?
For the quick benchmarks, as often as you like — they are short and item pools are randomised. For the IQ test, leave several weeks between attempts so practice effects do not inflate your score.
Do they work on mobile?
All of them run on mobile, but timing-sensitive tests are most accurate on a desktop with a physical keyboard. Each test records your device type so you can compare like with like.
Other tool categories
- PDF tools — Merge, split, compress, convert and organise PDFs without uploading a thing.
- Developer tools — Formatters, encoders, hashers and inspectors — the daily-driver dev bench.
- Text & Writing tools — Count, clean, convert and compose text with instant, precise feedback.
- Calculators tools — Money, dates, units and health — answers with the working shown.
- Generators tools — Passwords, QR codes, IDs and palettes — generated locally, never logged.
- Time & Focus tools — Pomodoro, stopwatch, countdowns and time zones — accurate to the millisecond.