The specific problems addressed by this website
Check text and background colors against WCAG 2.2 text contrast thresholds, with a color preview and boundary examples.
This site's tools and explanations focus on visual design. The guide provides examples, input limits, result definitions and checks. The tool does not replace inspection of the actual interface; interpret the results within the stated scope.
How to maintain content and computation
The tools were developed and verified by the site's maintainers; the articles are compiled by combining verified technical data, publicly available calculation methods, and examples designed by this site, and are edited using automated assistance. Source links, editorial suggestions, and hypothetical examples will be explained separately, and no fabricated real-world experiences, benefits, or usage data will be provided.
The date on the content indicates the time the description was checked, and does not imply that third-party services or standards will remain unchanged. Errors found will be corrected in calculations, examples, or descriptions, and the maintenance results will be recorded. You can provide non-sensitive examples that reproduce the problem via the contact page.
Usage and Restrictions
No account is required to use the tool; the script only processes your input. Articles and instructions are static web pages; the tool's calculations require JavaScript to be enabled in your browser. There are no paid features on the page, and no ads or third-party access statistics are currently displayed.
Please retain the original data, verify it with a small sample first, and confirm that the input units and usage scenarios conform to the guidelines before applying the results to your actual work. This site does not host user files, nor does it provide community posting or commenting functions.