Contrast Checker WCAG AA AAA

Pick two colors, get the exact WCAG 2.1 verdict - AA and AAA, normal and large text - plus the closest passing shade when a pair fails. All on-device.

Check the contrast ratio between any text and background color against WCAG 2.1 - the same AA and AAA thresholds you verify on the web, now in your pocket. Pick two colors and Contrast Checker shows the exact ratio and a pass/fail verdict for every level before your UI ships.

The math is implemented verbatim from the W3C specification: 8-bit sRGB relative luminance, the exact 4.5:1 / 3:1 / 7:1 thresholds, no rounding tricks. The hex code on screen is precisely the color the ratio was computed from - even when the system picker hands back a Display P3 color. And when a pair fails, Contrast Checker does not just say no: it finds the closest passing shade for you.

WHAT YOU GET

• The exact ratio - 4.61:1, not "looks fine" - recalculated live as you drag the color picker or paste a hex code • Four verdicts at a glance: AA and AAA, for both normal and large text, so you know exactly which compliance claim you can make • A one-tap fix when a pair fails: the nearest darker and the nearest lighter foreground shade that reach your target, background untouched • A live mock UI - headline, body copy, buttons - rendered in your exact colors, so you see the pair working before you commit it • A palette audit that checks a whole theme on one screen: "5 of 6 pass AA" instead of six separate lookups • A compliance report of your saved pairs - hex codes, ratios, pass/fail per level - ready to paste into a ticket, PR, or client handoff

PERFECT FOR

• Designers proving a design-system palette passes before handoff • iOS and web developers closing accessibility tickets with evidence instead of opinion • Agencies and freelancers who must document ADA / WCAG compliance for clients • Anyone tired of retyping hex codes into a website on a laptop to settle a color argument

WHY NOT JUST USE A WEB CHECKER?

Because the web checker is on your other machine, needs a connection, makes you type hex codes by hand, forgets every pair you ever tested - and when a color fails, it shrugs. Contrast Checker runs offline, uses real color pickers, remembers your pairs by project, and answers a failing check with the exact shade that passes.

PRIVATE BY DEFAULT

Every calculation happens on your device. No account, no sign-in, no uploads - your colors, palettes, and reports never leave your phone.

FULL ACCESS

Full Access unlocks unlimited saved pairs, unlimited rows in the palette audit, and export of the shareable compliance report. Choose a Weekly or Yearly auto-renewing subscription, or a one-time Lifetime purchase.

Download Contrast Checker, drop in the two hex codes you are unsure about, and have your AA verdict before your coffee cools.

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