Pricing

Pay per usage

Color Contrast Auditor (WCAG 2.2)

Audits any URL against WCAG 2.2 AA and AAA color contrast standards. Returns per-element contrast ratio, pass/fail flags, worst offenders, and overall A-F grade. Built on the heuristics from a battle-tested Chrome extension.

Pricing

Pay per usage

Rating

0.0

(0)

Developer

Coleton Patton

Actor stats

Bookmarked

Total users

Monthly active users

2 days ago

Last modified

What it does

Loads a URL in a real browser, walks every visible text element, computes the WCAG contrast ratio between the resolved foreground and background colors, and grades pass/fail against:

WCAG 2.2 AA — 4.5:1 normal text, 3:1 large text
WCAG 2.2 AAA — 7:1 normal text, 4.5:1 large text

"Large text" is 18pt+ (24px) regular OR 14pt+ (18.66px) bold per the spec.

Input

{ "url": "https://example.com" }

Or batch:

{ "urls": ["https://a.com", "https://b.com"] }

Max 1000 URLs per run.

Output

Each URL produces one dataset item:

{
  "url": "https://example.com",
  "grade": "B",
  "passRateAA": 92.3,
  "passRateAAA": 78.1,
  "elementsChecked": 247,
  "failAA": 19,
  "failAAA": 54,
  "worstOffenders": [
    {
      "selector": ".btn-cta",
      "textPreview": "Sign up free",
      "fgHex": "#FFFFFF",
      "bgHex": "#A0A0A0",
      "fontSizePx": 14,
      "fontWeight": 600,
      "isLargeText": false,
      "contrastRatio": 2.85,
      "aaThreshold": 4.5,
      "aaaThreshold": 7.0,
      "passAA": false,
      "passAAA": false
    }
  ],
  "allElements": [ /* full list, capped at 500 per page */ ]
}

Use cases

a11y monitoring pipelines — wire into CI to catch contrast regressions
Pre-launch design reviews — feed staging URLs, get a grade
WCAG audit automation — drop a sitemap, get a portfolio-wide report
Lead enrichment for a11y agencies — find prospects with failing pages

Pricing model (when published)

Pay-per-result: $0.10 per URL audited. Most pages return in 10-15 seconds.

Author note

Built by Peak Post — solo developer running 22 Chrome extensions with ~104 active users. This Actor ports the contrast-checking logic from the Color Contrast Checker Chrome extension into a programmatic API.

Roadmap

v1.1: pass non-text elements (icon contrast 3:1 minimum, WCAG 1.4.11)
v1.2: detect and skip decorative/aria-hidden text
v1.3: focus state contrast (hover/focus pseudo-elements)
v2.0: site-wide crawl mode with sitemap.xml ingestion

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