Contrast Check: #198754 on #FFFFFF

Bootstrap 5 success green (#198754) on White (#FFFFFF) — 4.53:1, passes AA normal + AAA large.

At a glance

Contrast ratio
4.53:1
WCAG AA (normal text)
Pass
WCAG AA (large text)
Pass
WCAG AAA (normal text)
Fail
UI components / non-text
Pass

Bootstrap 5 success green text on a white background is one of the most frequently checked combinations in web design. The measured WCAG 2.1 contrast ratio is 4.53:1. It passes WCAG AA for body text but falls short of AAA. Bootstrap 5 darkened the success green specifically to clear AA on white. A direct fix for the BS4 problem above.

Frequently asked questions

Is #198754 on #FFFFFF accessible?
For WCAG 2.1 AA — the most common conformance target — the answer is yes for normal-size body text. Normal text needs 4.5:1 and this combination measures 4.53:1. Large text (18pt+ or 14pt+ bold) needs only 3:1, so this combination passes for headings and large UI labels. AAA conformance demands 7:1; this combination falls short of that bar.
Where is this combination commonly used?
BS5 success text, confirmed states, inline status text.
How is this ratio calculated?
WCAG 2.1 contrast ratio is (L1 + 0.05) / (L2 + 0.05) where L1 and L2 are the relative luminances of the lighter and darker colors. Each channel is gamma-corrected (linearized) before applying coefficients 0.2126·R + 0.7152·G + 0.0722·B. The two formulas weight green most because the human eye is most sensitive to green wavelengths.
What if I need a higher ratio than 4.53:1?
Adjust either the foreground or background lightness in the calculator above. The Suggestions panel automatically computes the nearest passing color in each direction (lighter or darker) for AA and AAA targets.

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