Four domains
- Reaction Time — The moment green appears — can your fingers outpace your brain? Five rounds averaged to pin down your reflexes. Read more
- Memory Span — Can you hold a fleeting number in your mind? Find the edge of your working memory as digits grow. Read more
- Arithmetic Speed — 60 seconds — how fast does your mental calculator run? Don't stop when you get one wrong. Read more
- Aim Trainer — The distance between eye and hand. Chase 15 targets to measure your hand-eye coordination. Read more
Why measure?
Without knowing how fast you are, there's no baseline to improve against. Numbers enable comparison, comparison drives retry. One more round, then another. No grand promises about brain training — just a clear picture of where you stand.
Where do results go?
Only to this browser's localStorage. Nothing is sent to a server, nothing is shared with others. Clear your browser data and it's gone. See Privacy Policy for details.
Which devices?
Desktop and mobile browsers alike. Touch, mouse, and keyboard (Space for reaction, Enter for arithmetic and memory) are all supported. Note that results vary by device and environment — compare on the same device for fairness.
About ads
This site is free and supported by ad revenue. Currently ad slots are placeholders — ads will appear after Google AdSense approval. No ads are placed within 100px of the game canvas to prevent accidental clicks.