WCAG Color Accessibility Checker — Contrast Compliance Matrix
A WCAG color accessibility checker verifies that every color combination in your palette meets contrast standards for readability. ColorFlowPro generates a full contrast matrix — testing every foreground-background pair against WCAG AA and AAA levels for both normal and large text. No manual testing, no guesswork. Included free in every brand kit.
The Full Contrast Matrix
Most contrast checkers test one pair at a time. ColorFlowPro tests every combination in your palette at once, giving you a complete view of which pairs are accessible.
AAA Normal Text
7:1 contrast ratio or higher. The highest accessibility standard for body text at any size. Ensures readability for users with significant vision impairments.
AAA Large Text
4.5:1 contrast ratio. Applies to bold text 18px+ or regular text 24px+. Headings and large UI elements at the strictest standard.
AA Normal Text
4.5:1 contrast ratio. The minimum standard required by most accessibility regulations. Sufficient for most body text in web and mobile interfaces.
AA Large Text
3:1 contrast ratio. Minimum standard for large text elements. Applies to headings, buttons, and prominent navigation.
How the Accessibility Checker Works
Every color is paired with every other color
The checker takes every color in your palette — primary, secondary, accent, neutral, semantic, plus all shade values — and creates a matrix of every possible foreground-background combination.
Contrast ratios are calculated
For each pair, the checker calculates the WCAG relative luminance contrast ratio using the official W3C algorithm. This produces a precise numerical ratio (e.g., 4.73:1) for each combination.
AA and AAA levels are evaluated
Each ratio is compared against the four WCAG thresholds: AA normal (4.5:1), AA large (3:1), AAA normal (7:1), and AAA large (4.5:1). Pass/fail indicators appear instantly for each pair.
Results are displayed as a visual matrix
The contrast matrix shows all combinations in a grid format with color-coded pass/fail indicators. Scan rows and columns to find accessible pairs for any use case — text, buttons, icons, or backgrounds.
Logo backgrounds are auto-adjusted
When AI logos are generated, the checker evaluates logo contrast on light, dark, and brand-colored backgrounds. Logos are displayed on backgrounds where they maintain sufficient contrast for visibility.
Understanding WCAG Contrast Levels
Not sure which level you need? Here is a practical breakdown of when to use AA vs AAA.
WCAG AA — The Baseline
Level AA is the most widely adopted standard and the minimum requirement for most accessibility regulations, including the ADA, Section 508, and the European Accessibility Act. If you are building a public-facing website or app, AA compliance is typically mandatory.
- Normal text: 4.5:1 minimum contrast ratio
- Large text (18px bold / 24px regular): 3:1 minimum
- UI components and graphical objects: 3:1 minimum
WCAG AAA — The Gold Standard
Level AAA provides the highest level of accessibility. While not always required by law, it is recommended for content that serves elderly users, people with low vision, or any context where readability is critical — such as healthcare, government, and financial services.
- Normal text: 7:1 minimum contrast ratio
- Large text: 4.5:1 minimum
- Significantly reduces readability issues across all vision levels
Why Color Accessibility Matters
300M+ People Affected
Over 300 million people worldwide have color vision deficiency. Accessible color combinations ensure your content reaches everyone.
Legal Compliance
ADA, Section 508, EAA, and AODA all require minimum contrast ratios. Non-compliance can lead to lawsuits and fines.
Better UX for Everyone
High-contrast interfaces are easier to read in bright sunlight, on low-quality screens, and for aging eyes. Accessibility improves usability for all users.
Free for Every User
The WCAG contrast matrix is included in every brand kit at no cost. Free users get the full matrix with AA and AAA results for all color combinations. The accessibility data is also included in your brand guidelines PDF on the shades and accessibility page.
Check Accessibility FreeAccessibility Connects to Your Full Brand Kit
Frequently Asked Questions
What is WCAG?
WCAG stands for Web Content Accessibility Guidelines, published by the W3C. It defines standards for making web content accessible to people with disabilities, including color contrast requirements. WCAG 2.1 specifies minimum contrast ratios for text and UI elements to ensure readability for users with low vision or color vision deficiencies.
What contrast ratio is needed for WCAG compliance?
WCAG AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px+ bold or 24px+ regular). WCAG AAA requires 7:1 for normal text and 4.5:1 for large text. ColorFlowPro checks both levels for every color combination.
Does ColorFlowPro check all color combinations?
Yes. The accessibility checker generates a full contrast matrix that tests every possible foreground-background combination in your palette — including all shade values. You can instantly see which pairs pass AA, AAA, or fail.
Is the accessibility checker free?
Yes. The WCAG contrast matrix is included in every brand kit — free and paid. You can check all color combinations against AA and AAA standards at no cost. The accessibility data is also included in your brand guidelines PDF export.
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