Tanod utilpeek Color Conversion & WCAG Contrast Check

x402

Tanod utilpeek Color Conversion & WCAG Contrast Check is a paid API for AI agents from tanod.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-09).

Converts a CSS color to hex, RGB, HSL, HSV, CMYK, and OKLCH formats, and optionally checks WCAG 2.x contrast ratio (AA/AAA) against a background color.

Price / call$0.001

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StatusUnknown

How this service works

One MCP server and HTTP API with 193 pay-per-call tools for AI agents (security checks, chain data, finance, aviation, documents), plus free uptime and MikroTik monitoring and 130+ free browser tools. No signup; free daily tier. Operated by an AI.

Output

Returns the input color expressed in all major color spaces: hex, RGB, HSL, HSV, CMYK, and OKLCH. When a background color is provided, also returns the WCAG 2.x contrast ratio (a number like 4.5:1) and pass/fail status for both the AA and AAA accessibility conformance levels.

Example use cases

Accessibility audit for brand colors

“I need to know if my brand's primary color #1D4ED8 on a white background passes WCAG AA and AAA contrast standards — can you check and give me the contrast ratio?”

Design token color format conversion

“Can you take the color 'rebeccapurple' and give me its values in hex, RGB, HSL, HSV, CMYK, and OKLCH so I can add it to our design system tokens?”

Dark mode text legibility check

“Does dark gray text (#374151) on a navy background (#1E3A5F) pass WCAG 2.x accessibility contrast checks? Tell me the contrast ratio and whether it's AA or AAA compliant.”

Technical details

Endpoint

POSThttps://tanod.dev/v1/color/convert?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need comprehensive color format conversion across all major color spaces in a single call, or when checking WCAG 2.x accessibility compliance between a foreground and background color pair. It is especially valuable for design systems, accessibility audits, and CSS tooling workflows where multiple color representations are needed simultaneously.

Side effects

Invalid or unrecognized color string returns a 4xx error
Color name not in the 148 supported CSS names is rejected
Malformed hex (wrong number of digits) causes a parse error
Background color field provided but also malformed triggers validation failure

Input

Schema · Request body

Field	Type	Description
color	string	A CSS color: hex (#rgb, #rgba, #rrggbb, #rrggbbaa), rgb() / rgba(), hsl() / hsla() or a CSS color name (148 names, plus transparent).
background	—	Optional second color (e.g. the background): adds the WCAG 2.x contrast ratio and AA / AAA pass / fail.

Output

Schema · Response

{
  "type": "json",
  "example": {
    "color": {
      "hex": "#777777",
      "hsl": {
        "h": 0,
        "l": 46.67,
        "s": 0,
        "css": "hsl(0 0% 46.67%)"
      },
      "hsv": {
        "h": 0,
        "s": 0,
        "v": 46.67
      },
      "rgb": {
        "b": 119,
        "g": 119,
        "r": 119,
        "css": "rgb(119 119 119)"
      },
      "cmyk": {
        "c": 0,
        "k": 53.33,
        "m": 0,
        "y": 0,
        "note": "naive RGB to CMYK formula (no ICC profile, no ink limits): not a print proof"
      },
      "hex8": "#777777ff",
      "alpha": 1,
      "names": [],
      "oklch": {
        "c": 0,
        "h": null,
        "l": 0.5693,
        "css": "oklch(56.93% 0 none)"
      },
      "relative_luminance": 0.184475
    },
    "contrast": {
      "note": "WCAG 2.x contrast; pass/fail compares the unrounded ratio. Large text: at least 18 pt (24 px), or 14 pt (about 18.7 px) bold. Thresholds: AA 4.5 normal / 3 large, AAA 7 / 4.5, UI components and graphics 3 (SC 1.4.11).",
      "ratio": 4.48,
      "composited": false,
      "ratio_text": "4.48:1",
      "aa_large_text": true,
      "aa_normal_text": false,
      "aaa_large_text": false,
      "aaa_normal_text": false,
      "ratio_unrounded": 4.478089,
      "aa_ui_components": true
    },
    "background": {
      "hex": "#ffffff",
      "hsl": {
        "h": 0,
        "l": 100,
        "s": 0,
        "css": "hsl(0 0% 100%)"
      },
      "hsv": {
        "h": 0,
        "s": 0,
        "v": 100
      },
      "rgb": {
        "b": 255,
        "g": 255,
        "r": 255,
        "css": "rgb(255 255 255)"
      },
      "cmyk": {
        "c": 0,
        "k": 0,
        "m": 0,
        "y": 0,
        "note": "naive RGB to CMYK formula (no ICC profile, no ink limits): not a print proof"
      },
      "hex8": "#ffffffff",
      "alpha": 1,
      "names": [
        "white"
      ],
      "oklch": {
        "c": 0,
        "h": null,
        "l": 1,
        "css": "oklch(100% 0 none)"
      },
      "relative_luminance": 1
    }
  }
}

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