What is HoduAtlas?
Hodu is a walnut — its wrinkled shell resembles a brain. Atlas is a book of maps. HoduAtlas measures your brain across 6 domains and returns the results as numeric coordinates. No grand promises about "brain training." Just a clear picture of where you stand.
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. Records stay in your browser only — nothing goes to a server.
How measurement works
Each game repeats one focused task. Reaction time measures the delay from color change to input, memory span records digit length, arithmetic counts correct answers in 60 seconds, aim combines target time and hit rate, Korean letter memory records how many syllables you replay in order, and Stroop records how often you suppress word meaning and choose the actual ink color. Results are most meaningful when compared on the same device.
What makes it different
HoduAtlas pairs each playable test with explanations, benchmark tables, sources of error, and clear privacy notes. It makes the numbers readable without claiming medical diagnosis or guaranteed brain-training effects.
Six domains
- Reaction Time — The moment green appears — can your fingers outpace your brain? Five rounds averaged to pin down your reflexes.
- Memory Span — Can you hold a fleeting number in your mind? Find the edge of your working memory as digits grow.
- Arithmetic Speed — 60 seconds — how fast does your mental calculator run? Don't stop when you get one wrong.
- Aim Trainer — The distance between eye and hand. Chase 15 targets to measure your hand-eye coordination.
- Korean Letter Memory — Catch a fleeting line of Korean letters and replay them in order. A working-memory angle unique to Korean — visually denser than digits.
- Stroop Test — Ignore the word and choose the ink color. Measures attention switching and interference control when automatic reading gets in the way.
Where to go next
For more context behind each score, read the articles on sleep, caffeine, refresh rate, and working memory. The operating principles and data-storage details are summarized on the about page.