Online Color Contrast Analyzer — Free, No Download Required
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The Color Contrast Analyser (CCA) from TPGI (formerly the Paciello Group) is the most widely downloaded desktop application for checking WCAG contrast ratios. It is well-regarded and free. But downloading and installing a desktop application for what is fundamentally a browser-computable calculation adds unnecessary friction. A browser-based tool gives the same results with no installation.
What the CCA desktop app does
The Color Contrast Analyser is a small native app for Windows and macOS. You enter or sample foreground and background colors, and it shows the contrast ratio and WCAG AA/AAA pass/fail results. The key advantage of the native app over a browser: the built-in screen eyedropper can sample colors from anywhere on your screen — not just from within a browser tab.
This is valuable when you need to check colors from a native app, a PDF in a viewer, or a video. If you are working entirely with hex codes from CSS or a design file, the eyedropper advantage is irrelevant.
The browser-based alternative: same results, no install
The WildandFree Color Contrast Checker performs the same WCAG contrast ratio calculation in a browser tab. Enter your two hex codes and the ratio and all four WCAG pass/fail results appear immediately. You do not need to:
- Download an installer
- Run through an OS installation prompt
- Grant admin permissions
- Keep a desktop app updated separately from your browser
The browser tool also adds features not present in CCA: a rendered text preview showing what your combination actually looks like, a "Suggest Passing Color" button that auto-corrects failing foregrounds, and a swap-colors button for checking both reading directions instantly.
Sell Custom Apparel — We Handle Printing & Free ShippingWhen the desktop CCA app is still the better choice
Choose the CCA native app when:
- You need to sample colors directly from native applications, video, or PDF viewers — the screen-wide eyedropper is the CCA's main unique value
- You are conducting formal accessibility audits for clients who specifically require CCA output as documentation
- Your security policy does not permit browser-based third-party tools for accessibility testing
For all other use cases — CSS development, design review, brand palette verification — a browser tab is faster and equally accurate.
Using the online contrast analyzer in practice
Open the Color Contrast Checker alongside your work. The color inputs accept hex codes directly (paste or type) and also include a color picker for visual selection. The contrast ratio and badges update without needing to press any button.
For teams auditing design systems, the workflow is: extract hex codes from design files or CSS variables, paste into the checker, record the ratio and WCAG level. For developers checking specific implementations, use browser DevTools to find the computed color values, then verify in the checker.
Try It Free — No Signup Required
Runs 100% in your browser. No data is collected, stored, or sent anywhere.
Open Free Contrast CheckerFrequently Asked Questions
Is the CCA (Color Contrast Analyser) free?
Yes, the CCA from TPGI is free to download for Windows and macOS. The browser-based WildandFree checker is also completely free, with no download required.
Does the online checker produce the same contrast ratios as CCA?
Yes. Both tools use the identical WCAG 2.1 relative luminance formula. Given the same two hex codes, they will return the same contrast ratio. The formulas are specified in the W3C WCAG standard and are not subject to tool-specific interpretation.
Maya worked as a brand designer for eight years specializing in typography and visual identity for consumer brands. She writes about font tools and design with an expert eye for what separates professional work from amateur output.
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