WCAG Color contrast checker

To check the color contrast between foreground and background of the texts

WCAG Color Contrast Checker Chrome Extension

The WCAG Color Contrast Checker is an essential tool for web developers and designers aiming to ensure text visibility and accessibility. This extension checks the color contrast between the foreground and background of all elements on a webpage, following the WCAG 2.2 standards.

This extension evaluates the computed styles for color and background-color CSS properties, taking RGBA values and opacity into account for accurate contrast assessment. It also offers a simulation feature for color blindness, allowing developers to understand how their pages appear for colorblind users. Users can manually input colors for testing and even pick colors directly from the document. The tool automatically refreshes when there are DOM changes, although this feature can be deactivated for pages with frequent updates. Protect your website's accessibility today!

Manifest V3
Users:
80,000+
Rating:
4.25
(28)
Version:
3.8.4 (Last updated: 2024-03-03)
Creation date:
2020-06-26
Permissions:
  • activeTab
  • storage
  • webNavigation
Host permissions:
  • <all_urls>
Size:
166.91K
Full description:
See detailed description
Updated:
a day ago

Other platforms

WCAG Contrast checker (v3.8.4)
4,378+ 4.18 (17)
WCAG Color contrast checker (v3.8.4)
8,187+ 4.00 (1)

User reviews

Pros
  • Quickly identifies contrast issues on a page without needing manual capture.
  • Provides actual contrast ratios instead of just pass/fail grades.
  • Allows manual entry of color values.
  • Includes a feature to simulate different types of color blindness.
  • Auto-refreshes results when elements change.
Cons
  • Doesn't account for text on background images or CSS color-mixing issues.
  • Some users report inaccuracies in detecting foreground and background colors.
  • Recent updates raised privacy concerns regarding browser history access.
  • Can't identify specific elements causing contrast issues easily for large pages.
  • Panel cannot be repositioned on the screen, making it harder to use with certain layouts.
Most mentioned
  • Inability to precisely identify which elements are causing contrast issues.
  • Request for features to improve ease of use and visibility of results.
  • Concerns about privacy changes related to browser history access.
  • Need for support of newer color standards like APCA and Oklch.
  • Functionality issues with local PDFs and nested CSS styles.
These summaries are automatically generated weekly using AI based on recent user reviews. User reviews may be inaccurate, spammy, or outdated.
User reviews
I tried a bunch of contrast checking extensions and settled on this one! What I liked: 1) Immediately loads all the contrast pairs it finds in the page with no need to manually capture areas. 2) Provides the actual contrast ratios, not just a pass/fail grade. 3) You can still manually enter colour values if you want. 4) Has an awesome feature where you can quickly switch between different types of colour-blindness to see how those conditions impact the contrasts! Limitations: 1) Some pages will have problem areas such as text on background images which this system can not account for. 2) In a complex page, it can be difficult to identify a specific area in the page to find its contrast report. It needs to be located in reverse: clicking on the contrast pairs list items puts a red border on that element in the page (& scrolls to it). This helps, but some are still hard to locate. 3) The grading system only offers two levels (WCAG2.2 AA & AAA). It would be nice to have a custom field to set a targeted standard. 4) It would be nice if the custom colour entry had an eye-dropper tool. This would assist in problems 1 & 2.
by Wednesday Dessauer, 2025-01-29

Haven't had any major issues with it. Works well for what it is and can quickly verify contrast on page across multiple visual deficiencies.
by K B, 2024-09-27

Does not really work well, in some cases it detects the wrong colors for for- and background. forground: #ffffff background: #ffffff But on page it is: forground: #ffffff background: rgba(25, 145, 238, 0.8) It also does not respect text-shadows which improve the readability, which is confirmed by people with very bad eyesight.
by Orgoth Dorngree, 2024-08-07
View all user reviews

Extension safety

Risk impact
High risk impact

WCAG Color contrast checker requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood
Very low risk likelihood

WCAG Color contrast checker has earned a good reputation and can be trusted.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
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