WebAIM Contrast Checker review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

WebAIM Contrast Checker is a browser-based tool for evaluating foreground and background color contrast. It suits designers, developers, and accessibility teams who need to assess text and interface colors without paying for a checker. Enter hexadecimal values or select colors with the color picker; the tool reports a contrast ratio and pass/fail results for normal and large text, plus WCAG AA results for graphical objects and UI components. Its focus is practical contrast evaluation rather than a broader accessibility workflow.

The checker combines text and non-text checks in one interface. Text results show WCAG AA and AAA outcomes for normal and large text, while graphical objects and UI components are evaluated against WCAG AA criteria. Alpha adjustment and lightness sliders let users explore how color changes affect contrast. A bookmarklet offers a way to test colors from content on screen, and the basic API returns contrast ratios and pass/fail states for a permalink. These tools make it useful for teams that want both manual checks and a modest route to incorporate contrast results elsewhere.

The published coverage is WCAG 2.0 for text criteria and 2.1 for non-text criteria; teams whose requirements specifically call for WCAG 2.2 coverage should choose a checker that states that support. The tool evaluates one foreground/background pair at a time, so checking many combinations means repeating the process rather than submitting a batch. It is free, which makes it a straightforward fit for solo practitioners and teams of different sizes needing focused contrast checks. Choose it for accessible color review and simple API access; look elsewhere if batch evaluation or broader standards coverage is central to the workflow.

WebAIM Contrast Checker pros and cons

• Where it wins
  • Checks text and graphical/UI contrast with WCAG AA and AAA results
  • Color picker, alpha adjustment, and lightness sliders aid color exploration
  • Basic API and bookmarklet extend checking beyond the main web tool
• Where it doesn't
  • Evaluates one foreground/background color pair at a time
  • Published WCAG coverage is 2.0 and 2.1, not 2.2
  • API is described as basic rather than a broader integration suite

WebAIM Contrast Checker fact sheet, pricing and score →

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Last updated 20 Oct 2026 · How we research and update