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GET /v1/contrast

WCAG contrast ratio

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/color-api

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Code snippets

curl "https://api.oanor.com/color-api/v1/contrast" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/color-api/v1/contrast", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/color-api/v1/contrast");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/color-api/v1/contrast",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "wcag": {
            "aa_large": true,
            "aa_normal": false,
            "aaa_large": false,
            "aaa_normal": false
        },
        "ratio": 4.48,
        "background": "#777777",
        "foreground": "#ffffff"
    },
    "meta": {
        "timestamp": "2026-05-30T06:59:09.647Z",
        "request_id": "864579e5-ab40-4f72-9d25-99d38aa87e3f"
    },
    "status": "ok",
    "message": "Contrast computed",
    "success": true
}