Contrast Wizard
This tool tests 2 or 3 colors for contrast, and recommends colors with better contrast.
a11ycat·contrastwizard.com·a11ycat·contrastwizard.com·
Color Contrast
a11ycat·apps.apple.com·
APCA Readability Criterion • Contrast
a11ycat·readtech.org·WebAIM: Contrast Checker Bookmarklet
a11ycat·webaim.org·WebAIM: Link Contrast Checker
a11ycat·webaim.org·WCAG Color contrast checker - Microsoft Edge Addons
a11ycat·microsoftedge.microsoft.com·
WCAG Contrast checker – Get this Extension for 🦊 Firefox (en-US)
a11ycat·addons.mozilla.org·
Color Contrast Analyzer
a11ycat·chrome.google.com·
WCAG Color contrast checker
a11ycat·chrome.google.com·