WCAG Contrast Checker

WCAG Contrast Checker is the fast, pocket-sized tool for designers, developers, and accessibility auditors who need to verify color contrast against WCAG 2.1 AA and AAA standards — right on their phone.

Pick any two colors, see the contrast ratio instantly, and know whether your palette passes or fails for normal text, large text, and every WCAG level — all offline.

FEATURES
• Live contrast ratio display (e.g. 4.50:1) updated in real time
• WCAG 2.1 pass/fail badges: AA normal, AA large, AAA normal, AAA large
• Foreground and background color pickers with HSV color wheel
• Swap foreground and background colors in one tap
• Live sample panel — preview your actual text colors as you pick
• Color-blind simulation: Protanopia, Deuteranopia, Tritanopia
• Palette tab: paste up to 6 hex codes, generate a pairwise contrast matrix
• Color picker tab: mix any color with hue, saturation and lightness sliders, or type its hex code
• Copy a color as HEX, RGB or HSL in one tap
• Save up to 20 colors and use any of them as foreground or background in one tap
• Light, dark, and system theme
• Works fully offline — no account, no internet

HONEST SCOPE
This app checks contrast ratios and simulates color-blindness for up to 6 colors at a time. It does not offer a camera eye-dropper, CSV/JSON export, or full-site accessibility auditing. It covers WCAG 2.1 contrast criteria — not every accessibility requirement.

Free with ads. One-time purchase removes all ads forever.

Download and ship accessible colors with confidence.

Recent changes:
New: a color picker. Mix a color with hue, saturation and lightness sliders, copy it as HEX, RGB or HSL, save up to 20 colors, and use any color as foreground or background in one tap. Also: your colors now stay when you switch tabs, a typed hex code counts right away, and the pass/fail badges are easier to read. New languages: Nederlands, Polski, Українська, ไทย, 繁體中文.