Freedom251 › Accessibility Testing Software
Colour Contrast Analyser (CCA)
What Colour Contrast Analyser (CCA) is
Colour Contrast Analyser (CCA) is a free desktop application for checking color contrast on macOS and Windows. It helps optimize text and visual elements for people with color blindness or low vision. You can use it with websites, app development, social media graphics, PowerPoint slides, PDFs, and InDesign files. CCA reports contrast ratios against WCAG 2.0, 2.1, and 2.2. Colors can be entered or pasted as HEX, RGB, HSV, or HSL values, or sampled from a page or screen with foreground and background eyedroppers. Foreground alpha transparency is supported, and sliders help adjust colors toward a selected WCAG success criterion. A simulator checks results across eight vision-deficiency settings. Results can be copied in short or long formats for reports. Preferences include precision, updates, language, and picker shortcuts, with 12 listed languages, plus light, dark, and system themes.
Who it suits
CCA suits designers, developers, and content creators checking contrast across digital and document work. It is intended for people who need manual color checks on macOS or Windows.
What it does well
- Free plan costs 0.00 USD
- Supports WCAG 2.0, 2.1, and 2.2
- Eight vision-deficiency simulation settings
- Accepts four color value formats
- Copies results for assessment reports
What to know first
- No automated scans
- No manual review tools
- No browser extension
- No CI/CD integration
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Free colour contrast checker; current version 3.5.5 | Free |
As tpgi.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
CCA provides focused contrast checking with color sampling, adjustment controls, simulations, and report exports. It is a free macOS and Windows option for manual WCAG-oriented review.
Facts from Colour Contrast Analyser (CCA)'s own pages
- Automated scans
- No · tpgi.com, 23 Sept 2026
- Browser extension
- No · tpgi.com, 23 Sept 2026
- CI/CD integration
- No · tpgi.com, 23 Sept 2026
- Color adjustment
- Users can adjust foreground and background colors with sliders to reach a target WCAG success criterion. · tpgi.com, 11 Oct 2026
- Color entry
- Users can manually enter or paste color values in HEX, RGB, HSV, and HSL formats. · tpgi.com, 11 Oct 2026
- Color picking
- Foreground and background eyedroppers select colors from a page or screen and display the value in HEX by default. · tpgi.com, 11 Oct 2026
- Display
- CCA offers light, dark, and system default themes. · tpgi.com, 11 Oct 2026
- Distribution and warranty
- The page says CCA is distributed without warranty and points users to the GNU General Public License for details. · tpgi.com, 11 Oct 2026
- Free plan
- Yes · tpgi.com, 23 Sept 2026
- Maker history
- TPGi’s roots date to 2002, when Mike Paciello founded The Paciello Group; TPGi is now presented on Vispero’s site. · tpgi.com, 11 Oct 2026
- Manual review tools
- No · tpgi.com, 23 Sept 2026
- Preferences
- Preferences include ratio precision, automatic updates, the application language, and picker shortcut keys; the page lists 12 languages. · tpgi.com, 11 Oct 2026
- Purpose
- CCA checks color contrast to help optimize text and visual elements for people with color blindness or low vision. · tpgi.com, 11 Oct 2026
- Remediation guidance
- No · tpgi.com, 23 Sept 2026
- Reporting
- Users can copy contrast test results in short or long formats for assessment reports. · tpgi.com, 11 Oct 2026
- Standards
- CCA displays contrast ratio results according to WCAG 2.0, 2.1, and 2.2. · tpgi.com, 11 Oct 2026
- Support
- The product page directs questions and bug reports to TPGi’s CCA GitHub repository. · tpgi.com, 11 Oct 2026
- Transparency
- CCA supports alpha transparency values for foreground colors. · tpgi.com, 11 Oct 2026
- Use cases
- The checker can be used for websites, app development, social media graphics, PowerPoint slides, PDFs, and InDesign files. · tpgi.com, 11 Oct 2026
- Vision simulation
- The color blindness simulator checks contrast across eight vision deficiency settings. · tpgi.com, 11 Oct 2026
- WCAG coverage
- wcag 2.2 · tpgi.com, 23 Sept 2026
Where Colour Contrast Analyser (CCA) stands on Freedom251
- Accessibility Testing Software#104 of 169
- Website Accessibility Tools#83 of 133