Look up a colour name
API · /colorname-api
Color Name API
healthy
3,457 Subscribers
Name any colour. The nearest endpoint takes a colour as a hex, an rgb() value, an r,g,b triple or another name and returns the closest of the 140+ CSS named colours — matched perceptually with CIE76 Lab distance, not naive RGB, so the name actually looks right — along with the distance and whether it is an exact match. The name endpoint resolves a CSS colour keyword (e.g. rebeccapurple, cornflowerblue) to its hex and RGB, and list returns the whole named-colour set. Perfect for design tools and pickers, accessibility and theming, turning brand hex codes into human labels, and naming colours in generated palettes. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from colour conversion / palette / contrast tooling, which does not name colours.
api.oanor.com/colorname-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 93 ms
- Server probes · 24h
- Subscribers
- 3,457
- active
- Total calls
- 52
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 1,005 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 1,005 calls/month
- 2 req/sec
- Nearest + name + list
- No credit card
Starter
€0.45 /month
- 8,450 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 8.45k calls/month
- 8 req/sec
- Perceptual Lab matching
- Email support
Pro
€20.35 /month
- 135,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 135.5k calls/month
- 20 req/sec
- Design / theming pipelines
- Priority support
Mega
€58.35 /month
- 715,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 715k calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
Related APIs
Other APIs with overlapping tags.
Color Distance API
CIE colour science as an API: convert colours through the device-independent spaces and measure how different two colours really look. The convert endpoint takes a colour as hex, RGB or CIELAB and returns it in sRGB hex, RGB, CIE XYZ and CIELAB (D65 white point). The distance endpoint computes the perceptual difference between two colours with all three standard Delta-E formulas — CIE76 (plain Lab distance), CIE94, and CIEDE2000, the modern and most accurate metric — and tells you whether the difference is perceptible. The nearest endpoint finds the closest named colour to any colour by CIEDE2000. This is the maths behind colour matching, print and brand-colour QC, and tolerancing — distinct from simple hex/RGB/HSL conversion. Everything is computed locally and deterministically, so it is instant and private. Ideal for print and prepress, brand-colour compliance, textile and paint matching, image processing and computer vision, and design tooling. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is CIE colour difference; for hex/RGB/HSL/CMYK conversion, palettes and WCAG contrast use a colour API.
api.oanor.com/colordelta-api
Color Temperature API
Turn physical light into RGB colours — entirely locally. The kelvin endpoint converts a colour temperature in Kelvin into the RGB colour of a black body at that temperature: warm candle and incandescent tones below 3000 K, neutral and daylight whites around 5000–6500 K, and cool bluish light above, using Tanner Helland's widely-used approximation and returning hex, an rgb() string and a plain-English description (candlelight, warm white, neutral, daylight, cool). The wavelength endpoint converts a wavelength of visible light in nanometres (380–780 nm) into the approximate RGB colour the human eye perceives, with the natural intensity fall-off at the violet and red edges of the spectrum, and names the band (violet, blue, cyan, green, yellow, orange, red). Everything is computed locally and deterministically, so it is instant and private. Ideal for lighting and smart-bulb apps, photography and white-balance tools, data-visualisation of temperature or spectra, theming and UI accents, and science and education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. These are perceptual approximations, not colorimetric CIE conversions; for hex/RGB/HSL conversion and palettes use a colour API.
api.oanor.com/colortemp-api
Gradient API
Generate colour gradients and colour scales programmatically. Produce an evenly-spaced scale of N colours between two or more stops (interpolated in a perceptually smooth colour space — lab, lch, oklab, oklch — or plain rgb/hsl), get a single interpolated colour at any position between two colours, and build a ready-to-paste CSS gradient string (linear with any angle, or radial) from a list of stops. Colours accept hex (#f00, #ff0000) or CSS names (red, steelblue). Perfect for data-visualisation colour ramps, heatmaps, chart palettes, theme generation and UI backgrounds. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from colour conversion / harmonious palettes (one base colour) and image palette extraction.
api.oanor.com/gradient-api
Color Blindness Simulator API
See your colours the way colour-blind users do. Pass a hex colour (or a whole palette) and get back how it appears under each major colour-vision deficiency — protanopia (red-blind), deuteranopia (green-blind), tritanopia (blue-blind) and achromatopsia (total colour blindness) — as simulated hex and RGB values. Roughly 1 in 12 men and 1 in 200 women have some colour-vision deficiency, so this is ideal for accessibility testing of UI themes, charts, maps, status colours and branding: simulate your palette, spot colours that become indistinguishable, and fix them before you ship. Pure local matrix transforms — no key, no third-party service, instant. Live. 4 endpoints. Distinct from colour conversion and contrast tools.
api.oanor.com/colorblind-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Color Name API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Color Name API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Color Name 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 Name API cost?
Color Name API has a free tier with 100 calls / month. Paid plans start at €0.45 / 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 Name API GDPR-compliant?
All requests to Color Name 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/colorname-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/colorname-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/colorname-api/SOME_PATH");
curl_setopt($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/colorname-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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