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
• 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.