Contrast Checker — Free WCAG Color Contrast Tool | Web4Strategy

Check WCAG AA and AAA contrast for text and UI colors. Load samples, preview type, and copy CSS in the browser.

About this resource

Check WCAG 2 contrast between text and background colors, with live previews, failing samples, and copy-ready CSS. This Web4Strategy utility is part of the Design catalog. Review the page instructions before entering data, and keep passwords, access tokens, private keys, and other secrets out of browser tools unless the page explicitly documents a secure purpose and processing boundary.

About Web4Strategy

Web4Strategy publishes free browser-based web utilities, reusable React interface templates, open agent skills, prompts, product specifications, and structured public directories. Most browser tools run locally without an account. Machine clients can use stable canonical URLs, the XML sitemap, llms.txt, Markdown content negotiation, public JSON endpoints, and the OpenAPI document. Web4Strategy’s public identity is a product and resource library for developers, designers, builders, and product teams.