Color Contrast Checker

Automated accessibility audits consistently find insufficient color contrast as the single most frequent violation across scanned websites, ahead of every other accessibility issue category combined — and unlike many accessibility problems, which require structural or semantic markup changes to fix, a contrast failure is usually resolved by darkening or lightening one color slightly, with no change to the page's structure, markup, or design layout required at all. That combination — extremely common, but comparatively cheap to fix once identified — is exactly why a dedicated contrast checker is worth using directly on a specific color pairing before it ships, rather than relying on a full accessibility audit to catch it after the fact.

WCAG defines two conformance levels with different numeric thresholds, and which one applies depends on both the level a project has committed to and the size of the specific text being checked. Level AA — the level most legal accessibility requirements and organizational policies reference — requires a 4.5:1 ratio for normal-sized text but relaxes to 3:1 for large text, defined as 18pt or 14pt bold and above, since larger glyphs remain legible at lower contrast than small ones do. Level AAA, a stricter standard, raises those same thresholds to 7:1 and 4.5:1 respectively. Most projects target AA as the practical baseline; AAA is reserved for content specifically aimed at users with more significant visual impairment, where the stricter threshold is worth the additional design constraint it imposes.