WCAG contrast ratio
API · /color-api
Color API
healthy
4,415 Subscribers
A complete colour toolkit — convert between hex, RGB, HSL, HSV and CMYK with relative luminance, generate harmonious palettes (complementary, triadic, tetradic, analogous, monochromatic, shades), and compute WCAG contrast ratios with AA/AAA pass-fail for accessibility. Server-side, instant, no third-party services.
api.oanor.com/color-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 68 ms
- Server probes · 24h
- Subscribers
- 4,415
- active
- Total calls
- 28
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 12,000 calls / month
- 3 requests / second
- Hard cap (429 above quota, no overage)
- 12,000 conversions/month at 3 rps
- Hex/RGB/HSL/HSV/CMYK conversion
- No credit card
Basic
€6.00 /month
- 150,000 calls / month
- 12 requests / second
- Hard cap (429 above quota, no overage)
- 150,000 calls/month at 12 rps
- Palette generation + luminance
- Commercial use allowed
Pro
€18.00 /month
- 750,000 calls / month
- 35 requests / second
- Hard cap (429 above quota, no overage)
- 750,000 calls/month at 35 rps
- WCAG AA/AAA contrast pass-fail
- Batch multi-color endpoint
- Email support
Mega
€44.00 /month
- 3,000,000 calls / month
- 90 requests / second
- Hard cap (429 above quota, no overage)
- 3,000,000 calls/month at 90 rps
- Priority support + 99.9% SLA
- All endpoints unlocked
- Bulk palette + contrast batching
Built by
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Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Color API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Color API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Color API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Color API cost?
Color API has a free tier with 100 calls / month. Paid plans start at €6.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Color API GDPR-compliant?
All requests to Color API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/color-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/color-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/color-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/color-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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