Last updated
August 18, 2026
Purpose of the service
This site is a free web service that measures cognitive domains — reaction time, memory span, arithmetic, and aim — through simple mini-games and returns the results as numbers. Results are stored only in your browser (localStorage) and are never transmitted to a server.
Not a medical diagnosis
All measurement results on this site are for-reference entertainment figures and cannot serve as the basis for medical diagnosis, treatment, or prescription. Values for reaction time, memory, and calculation speed are influenced by sleep, fatigue, device, and environment, and a single measurement cannot assess cognitive function or neurological conditions (dementia, ADHD, brain injury, etc.). If you have health concerns or suspect cognitive decline, please consult a licensed medical professional.
No guaranteed brain-training effect
This site does not claim to 'train' or enhance brain function. Improvements from repeated play may reflect learning effects and do not imply improvement in general cognitive ability.
Accuracy limitations
Browser-based measurements incur error from monitor refresh rate, input latency, device performance, and browser implementation. They are not laboratory-grade measurements and are meaningful only for relative comparison on the same device.
User responsibility
Stop immediately if you experience physical discomfort from excessive tension or repetition during measurement. Minors should use this site under guardian supervision.
Intellectual property
The site's design, copy, and game implementations are original works of HoduAtlas. The underlying game concepts (e.g., reaction time measurement) are shared ideas, but the expression on this site may not be copied without permission.
Changes to these terms
These terms may change as needed for site operation; updates will be posted on this page.
Contact
For inquiries regarding these terms, please email hello@hoduatlas.com.