Colour Contrast Analyser3.5.5

Use Colour Contrast Analyser to compare foreground and background colours and obtain a contrast ratio for text or visual elements. It helps designers and reviewers identify colour combinations that may be difficult to distinguish, including for people with colour-blindness or low-vision impairments. Results are measured against WCAG 2.0, 2.1, and 2.2 criteria at A, AA, and AAA levels.

The tool suits website work, app development, social media graphics, PowerPoint slides, PDFs, InDesign files, and other visual content. Users can type or paste colour values in HEX, RGB, HSV, or HSL formats, with alpha transparency supported for foreground colours. Eye-dropper controls for both foreground and background colours capture a colour from a page or screen and show its HEX value by default, while a switch control exchanges the two selections. Colour sliders and additional RGB, HSV, and HSL displays help adjust either colour until it reaches a chosen WCAG success criterion.

Test results can be copied in short or long formats for assessment reports, with both formats editable through the CCA menu preferences. Those preferences also control decimal-place precision, automatic updating, the system-default language or one of 12 languages, and shortcut keys for activating either colour picker; eight vision-deficiency settings are available for readability checks. The current 3.5.5 release is freeware for MacOS and supports both Intel and Apple Silicon architectures.