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API · /colorblind-api

Color Blindness Simulator API

healthy 4,704 Subscribers

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.

#color-blindness #accessibility #a11y #color #developer-tools #design
api.oanor.com/colorblind-api
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Machine-readable spec so AI agents can integrate this API.

/api/colorblind-api/openapi.json
/api/colorblind-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
94 ms
Server probes · 24h
Subscribers
4,704
active
Total calls
56
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,520 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,520 calls/month
  • 2 req/sec
  • 4 deficiency types
  • No credit card
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Starter

€7.00 /month

  • 29,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 29k calls/month
  • 8 req/sec
  • Palette simulation
  • Email support
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Pro

€26.60 /month

  • 184,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 184k calls/month
  • 20 req/sec
  • Accessibility CI checks
  • Priority support
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Mega

€62.60 /month

  • 940,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 940k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

ADA Ramp API

ADA wheelchair-ramp maths as an API, computed locally and deterministically — the run, landing and slope numbers a builder or accessibility planner sizes a ramp by. The rule the ADA fixes is 1 inch of rise per 12 of run, a maximum 8.33 % slope, so the ramp endpoint turns a rise into the ramp: run = rise × 12 (or × 16 / × 20 for a gentler grade if you have the room), plus the level landings the code requires — a 5-foot landing top and bottom and another between runs whenever the rise exceeds 30 inches — and the total length end to end, so a 24-inch rise needs a 24-foot run and 34 feet overall, while a 36-inch rise breaks into two runs with an intermediate landing for 51 feet. The fit endpoint answers the real-world question: does a ramp for this rise fit the run you have? It returns the minimum run an ADA 1:12 ramp needs, whether your space is enough, and the slope you would actually get if you forced it in — flagging when that exceeds 8.33 % and you need a switchback or a lower rise. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, accessibility, home-modification and contractor app developers, ramp-estimator and code-check tools, and building software. Pure local computation — no key, no third-party service, instant. Confirm against current ADA and local code. Live, nothing stored. 2 compute endpoints.

api.oanor.com/adaramp-api

Slope & Grade API

Slope and grade maths as an API, computed locally and deterministically. The convert endpoint converts a slope between every common form — percent grade, angle in degrees, a ratio such as 1:12, per mille and rise-per-run — where the slope m = rise ÷ run = tan(angle). The distance endpoint relates the run (horizontal), the rise (vertical) and the slope distance (the hypotenuse) of a right-triangle slope: give any two, optionally with the grade or angle, and it returns the rest. The ramp endpoint sizes a wheelchair or ADA ramp — from a rise and a maximum slope (defaulting to 1:12, the ADA maximum of 8.33%) it returns the required run and total ramp length, and if you supply an actual run it checks whether the ramp is within the limit. Everything is computed locally and deterministically, so it is instant and private. Ideal for civil-engineering and surveying tools, road, trail and accessibility apps, construction and ramp design, and mapping software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is slope and grade geometry; for roof pitch specifically use a roofing API.

api.oanor.com/slope-api

Braille API

Convert text to Unicode braille and back. Uses uncontracted (Grade 1) English braille: the 26 letters, digits with the number sign, capitals with the capital sign, and common punctuation, all output as Unicode Braille Patterns (U+2800–U+28FF) so they render anywhere. The to-braille endpoint turns ordinary text into braille; the from-braille endpoint decodes braille back to text. Unknown characters pass through unchanged. Perfect for accessibility tooling and education, labels and signage mockups, braille-display previews and learning resources. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. Grade 1 only (no contractions). Distinct from cipher/alphabet encoders and from general text transforms.

api.oanor.com/braille-api

Color API

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

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Color Blindness Simulator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Color Blindness Simulator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Color Blindness Simulator 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 Blindness Simulator API cost?
Color Blindness Simulator API has a free tier with 100 calls / month. Paid plans start at €7.00 / 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 Blindness Simulator API GDPR-compliant?
All requests to Color Blindness Simulator 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/colorblind-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/colorblind-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/colorblind-api/SOME_PATH");
curl_setopt($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/colorblind-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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