The Colour Contrast Analyser (CCA) helps you determine the legibility of text and the contrast of visual elements, such as graphical controls and visual indicators.

This repository contains the source code for the new Colour Contrast Analyser (CCA) builds for Windows and macOS based on Electron. For the previous, non-Electron versions ("CCA Classic"), see the CCA-Win and CCA-OSX repositories.

For further information, see TPGi's Colour Contrast Analyser resource page.

• WCAG 2.1 compliance indicators
• Several ways to set colours: raw text entry (accepts any valid CSS colour format), RGB sliders, colour picker (Windows and macOS only)
• Support for alpha transparency on foreground colours
• Colour blindness simulator

• See the known issues for the latest CCA release and confirmed bugs

If you have an idea for a new feature, or if you found a bug, please submit a GitHub issue. Please search the existing issues before submitting to prevent duplicates.

If you want to contribute, please send a pull request and someone will review your code. Please follow the Contribution Guidelines before sending your pull request.

If you have any questions, feel free to open an issue here on GitHub.

Colour Contrast Analyser (CCA) is Free Software: You can use, study share and improve it at your will. Specifically you can redistribute and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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.