7 Best Color Contrast Checkers for Web Accessibility (2026)
TLDR
For quick ratio checks, WebAIM Contrast Checker is the fastest free tool. For design work in macOS, Colour Contrast Analyser is the standard desktop app. For site-wide contrast issue detection, A11yProof finds all contrast failures across your entire site automatically. Stark integrates into Figma for design-time checks. axe DevTools and Lighthouse catch contrast issues in the browser during development.
| Tool | Starting Price | Best For | Key Limitation |
|---|---|---|---|
| WebAIM Contrast Checker | Free | Quick single-pair checks | Manual input, no site scanning |
| Colour Contrast Analyser | Free | Design tool color picking | One pair at a time |
| A11yProof | $29/mo | Site-wide contrast auditing | Paid, more than needed for one-off checks |
| Stark | $45/mo | Figma/Sketch design workflow | Design tools only, not live sites |
| axe DevTools | Free | Developer browser testing | Manual page-by-page, not standalone |
| Lighthouse | Free | Quick page audits | Less thorough than dedicated tools |
| Coolors | Free | Palette design phase | No site scanning, one pair at a time |
WebAIM Contrast Checker
Web-based tool from WebAIM for checking foreground/background color combinations against WCAG contrast requirements. Enter hex values, get pass/fail for AA and AAA.
Pros
- ✓ Free, no account required
- ✓ Instant pass/fail for WCAG 2.1 AA and AAA
- ✓ Shows ratio for normal text and large text separately
- ✓ Simple enough for designers and non-developers
Cons
- × Manual input only — enter one color pair at a time
- × Cannot scan a site to find all contrast failures
- × No design tool integration
Pricing: Free
Verdict: Best quick-check tool for known color pairs. The industry standard for verifying a specific foreground/background combination. Not useful for finding unknown contrast failures across a site.
Colour Contrast Analyser
Free desktop application by TPGi (formerly Paciello Group). Uses an eyedropper to sample colors from anywhere on screen — works with any application, not just browsers.
Pros
- ✓ Free desktop app for Windows and Mac
- ✓ Eyedropper picks any color from the screen
- ✓ Works with Figma, Sketch, PDFs, images, native apps
- ✓ Simulates color vision deficiency types
Cons
- × Requires installation
- × One color pair at a time
- × No site-wide scanning capability
- × Less useful for developers who work in browser-based tools
Pricing: Free (desktop app, Windows and Mac)
Verdict: Best for designers checking colors from any design tool, mockup, or application. The screen picker works outside the browser, making it useful for native app, PDF, and image accessibility checks.
A11yProof
AI-powered accessibility scanner that identifies all contrast failures across your entire site automatically, with specific fix suggestions for each failure.
Pros
- ✓ Site-wide automated contrast scanning
- ✓ Reports affected elements, not just color pairs
- ✓ AI fix suggestions specify the corrected color values
- ✓ Catches dynamic and interactive state contrast (hover, focus)
Cons
- × Paid tool — not a quick free check
- × More than you need for checking a single color pair
- × No design tool integration
Pricing: $29-$199/mo
Verdict: Best for finding contrast issues at scale. Instead of checking individual color pairs, A11yProof scans every page and reports every contrast failure with the affected element, current ratio, and required ratio. Fix suggestions specify the exact color adjustment needed.
Stark
Accessibility toolkit for Figma, Sketch, and Adobe XD. Includes contrast checking alongside color blindness simulation, focus order visualization, and alt text management.
Pros
- ✓ Native Figma plugin — checks contrast without leaving the design tool
- ✓ Checks all layers automatically, not just selected pairs
- ✓ Color blindness simulation alongside contrast
- ✓ Integrated with Sketch and Adobe XD
Cons
- × Paid subscription — free tier has limits
- × Only useful if your team uses Figma, Sketch, or Adobe XD
- × Does not check live web pages
Pricing: $45/mo (Pro, includes contrast checker)
Verdict: Best for design teams doing accessibility checks inside Figma. Contrast checking integrated into the design workflow prevents violations from reaching development.
axe DevTools
Browser extension that includes contrast checking as part of its full WCAG scanning. Flags contrast failures on the current page with the element and current ratio.
Pros
- ✓ Free browser extension
- ✓ Contrast checking alongside full WCAG scanning
- ✓ Shows which element failed and why
- ✓ Works on any rendered web page
Cons
- × Manual page-by-page testing only
- × Not a standalone contrast checker — bundled with full scan
- × Requires visiting each page to test
Pricing: Free (extension)
Verdict: Best developer tool for catching contrast failures on live pages during development. Free and covers contrast as part of broader accessibility checking — not a standalone contrast tool.
Lighthouse
Built into Chrome DevTools. Includes accessibility scoring that flags low contrast as one of its checks.
Pros
- ✓ Free, built into every Chrome browser
- ✓ No installation required
- ✓ Accessibility score alongside performance and SEO
- ✓ CI integration via Lighthouse CI
Cons
- × Less thorough contrast coverage than dedicated tools
- × Single page only
- × May miss contrast in interactive states (hover, focus)
Pricing: Free (built into Chrome)
Verdict: Useful for quick contrast checking alongside performance audits. Not as thorough as dedicated contrast tools — may miss some contrast failures that specialized tools catch.
Coolors Contrast Checker
Color palette tool with a built-in contrast checker. Useful for designers working on color palette design who want to verify accessibility as they build the palette.
Pros
- ✓ Free to use
- ✓ Integrated into color palette workflow
- ✓ Shows WCAG AA and AAA for multiple text sizes
- ✓ Easy to iterate on colors and recheck
Cons
- × One pair at a time
- × No site scanning
- × Most useful during palette creation, not auditing
- × No design tool integration
Pricing: Free
Verdict: Best for designers building accessible color palettes. Useful when starting fresh with color selection, less useful for checking existing site colors.
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Why Color Contrast Is the Most Common WCAG Failure
The WebAIM Million study scans the top 1 million websites annually. Low contrast text is consistently the most common automatically-detectable WCAG failure — appearing on over 80% of home pages in recent years.
The failure is common because contrast is often deprioritized in design. Light gray text on white backgrounds is a popular design aesthetic that frequently fails WCAG 1.4.3. Colored buttons with insufficient contrast between button color and text appear across nearly every design system that was not built with accessibility in mind.
Two Different Problems: Checking vs. Finding
The tools in this list solve two different problems:
Checking a known color pair — you have a specific foreground and background color and want to know if it passes. WebAIM, Colour Contrast Analyser, and Coolors are built for this. Enter or pick two colors, get a ratio, see pass/fail.
Finding unknown contrast failures — you have a site and want to know every place where contrast is insufficient. A11yProof and axe DevTools are built for this. They scan the rendered page and report every element that fails.
Most organizations need both: checking tools during design to verify new colors, and scanning tools to find failures in existing content.
WCAG 2.1 vs. WCAG 2.2 Contrast Requirements
WCAG 2.1’s contrast requirements (1.4.3 for text, 1.4.11 for non-text) remain in WCAG 2.2 — they were not changed. WCAG 2.2 added new requirements for focus indicator contrast (2.4.11), but the fundamental text contrast ratios are the same: 4.5:1 for normal text and 3:1 for large text.
The most common gap organizations discover when checking focus states against WCAG 2.2: a focus indicator that uses only a color change (blue outline on a blue button) without sufficient contrast change between focused and unfocused states.
Design Tool Integration
The most impactful place to catch contrast failures is in the design file, before any code is written. Stark’s Figma plugin automates contrast checking across all layers as you design — faster than using an external checker for each color decision.
If your design team does not use Figma, Colour Contrast Analyser’s screen eyedropper works with any tool on your computer. Pick the foreground color from your design, pick the background, and see the result in seconds.
Sites with established design systems should add contrast ratios to their design token documentation — specifying not just the color values but the approved pairings that meet 4.5:1. This prevents contrast failures from being introduced when tokens are updated.
Q&A
What is the fastest way to check if my site's colors meet WCAG contrast requirements?
For a specific color pair (your brand blue text on a white background), WebAIM Contrast Checker is the fastest — enter the two hex values and get an immediate pass/fail result. For finding all contrast failures across your entire site without checking each element manually, A11yProof's automated scanning identifies every failing element and page in one scan.
Q&A
Which contrast checker should designers use during the design process?
Stark (for Figma/Sketch) checks contrast natively inside design tools as you work. Colour Contrast Analyser's eyedropper works across any tool on your screen — useful if your team does not use Figma. WebAIM Contrast Checker is the quick reference check for verifying specific values. Using any of these during design prevents contrast failures from reaching development.
Find a better way to handle accessibility
What contrast ratio do I need for WCAG 2.1 AA compliance?
Does contrast ratio apply to placeholder text?
How do I check contrast for hover and focus states?
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