One Colour Contrast Tool for All Your WCAG Color Checking Needs
The colour contrast checker can be used on websites, during app development, designing social media graphics, PowerPoint slides, PDFs, InDesign files, and almost anything!
- Compliance indicators for WCAG 2.1
- Dark Mode
- Multiple ways to select colors: You can manually enter CSS color formats, use an RGB slider, or opt for the color picker tool
- Color Blindness Simulator
- Support for alpha transparency
on foreground colors
Go Beyond Color, Design Inclusive User Experiences
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Common Web Accessibility Issues
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AT User Flow Testing
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Learn more about WCAG Color Contrast
WCAG 2.0 Level AA
This level requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text.
WCAG 2.1 Level AA
This level requires a contrast ratio of at least 3:1 for graphics and user interface components.
WCAG Level AAA
This level requires a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text.
Additional Color Contrast Analyzer Information
The current version of the Colour Contrast Analyzer (CCA) has been rebuilt from the ground up using Electron. For the previous, non-Electron versions (“CCA Classic”), see the CCA-Win and CCA-OSX repositories.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.