Merlin
WCAG Contrast checker

WCAG Contrast checker

Checks for compliance with the contrast levels of foreground and background colors combination based on the requirements of WCAG 2.2

What is WCAG Contrast checker?
"WCAG Contrast checker" is a Firefox add-on designed for web developers and designers to assess the contrast between text and background colors on web pages, ensuring they meet the Web Content Accessibility Guidelines (WCAG) 2.2 standards. It automatically analyzes page elements, considers RGBA values and element opacity, and provides a manual testing feature for custom color pairs. With dynamic page monitoring and an option to disable auto-refresh on active pages, it's a comprehensive tool for maintaining accessibility standards.
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Merlin
Stats
By: Rumoroso
Users: 4,408 ▲ 22
Rating: 4.23 (13)
Version: 3.8.4 (Last updated: 2024-03-02)
Creation date: 2008-05-25
Weekly download count: 79
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
Permissions:
  • <all_urls>
  • activeTab
  • storage
  • webNavigation
Size: 170.77K
Stats date:

Chrome-Stats Rank

# 1296 ▼ 5
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Other platforms

Not available on Chrome
Not available on Edge
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Chrome-Stats extension
Merlin
Summary
Analyze keywords

It evaluates the contrast on all elements of the page considering their computed style for the color and background-color CSS properties. In case of these colors are defined with RGBA values, it also considers the opacity to deduce the real color that finally is show.

The tool also includes two fields in which the colors can be introduced manually to be tested.

Finally, it auto-refreshes when DOM of the page changes (addition or removing elements), but if the page has many changes, this behavior can be de-activated.

Privacy statement on: https://rumoroso.bitbucket.io/

User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Helps a lot when checking sites for color contrasts
  • Useful for improving accessibility
  • Liked by users when functioning correctly
Cons
  • Overrides default shortcut for selecting an element in the Inspector
  • Some features (like the eyedropper) don't work as expected
  • Issues with locating the specific elements with contrast issues on the page
Most mentioned
  • Overrides Ctrl-Shift-C shortcut
  • Difficulty in locating contrast issues on the webpage
  • Eyedropper feature can be unreliable
Recent reviews
Nice extension, but don't work now. I have the same problem on Chrome. I put the five stars when the extension works again ;) //EDIT : thanks for the correction.
by Patrice, 2024-03-02
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Safety
Risk impact

WCAG Contrast checker is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install WCAG Contrast checker if you trust the publisher.

Risk likelihood

WCAG Contrast checker is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

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Screenshots
WCAG Contrast checker WCAG Contrast checker