Contrast checker
WCAG ratios, and the nearest passing colour that keeps your hue.
Nothing you enter is sent anywhere
4.88:1: fine for body text at AA. AAA would need 7:1.
Large heading, 24px
Body text at fifteen pixels. If you are squinting at this, the number above is telling you why.
Small print at twelve pixels, where contrast bites hardest.
Against each threshold
PassBody text, AA4.5:1 · the bar for anything under 18pt
FailBody text, AAA7:1 · required for some public sector work
PassLarge text, AA3:1 · 18pt, or 14pt bold and above
PassLarge text, AAA4.5:1
PassIcons and borders3:1 · buttons, form outlines, focus rings