Colors on the Web Contrast Checker review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Colors on the Web Contrast Checker is a free browser-based tool for people who need to assess individual foreground and background color combinations. It checks text, UI components, and graphics against WCAG 2.1 and 2.2 AA and AAA requirements, then displays contrast ratios and pass/fail results for normal and large text. This makes it relevant to designers, developers, and other users reviewing color choices, especially where a quick check of a specific pairing is the goal.

The checker goes beyond reporting a ratio: when a combination fails, it provides calculated color adjustments, and it also offers AI-powered color suggestions. Users can preview text at multiple sizes and weights, inspect foreground and background values in hex, RGB, and HSL, and simulate color blindness. A shareable link makes it possible to pass along a particular combination for review. These features support focused comparison and refinement, but the checker remains centered on color pairings rather than broader accessibility evaluation.

The published Free plan covers contrast checks for individual color combinations, and the product is available on the web. Its one-combination-at-a-time scope is important: it does not determine whether an entire website conforms to WCAG. Choose it when you want a free way to evaluate and adjust particular colors, including text and non-text uses. If your priority is assessing a whole site rather than reviewing individual combinations, this tool is not designed to provide that site-wide determination.

Colors on the Web Contrast Checker pros and cons

• Where it wins
  • Checks text, UI, and graphics against WCAG 2.1 and 2.2 AA and AAA requirements
  • Suggests calculated color adjustments and AI-powered alternatives
  • Includes text previews, color-vision simulation, and shareable links
• Where it doesn't
  • Evaluates one foreground/background combination at a time
  • Does not determine whether an entire website conforms to WCAG
  • Available as a web tool rather than a desktop or mobile app

Colors on the Web Contrast Checker fact sheet, pricing and score →

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 20 Oct 2026 · How we research and update