Golden section of a length
API · /goldenratio-api
Golden Ratio & Scale API
healthy
4,978 Subscribers
Design-proportion maths as an API, computed locally and deterministically. The divide endpoint splits a length by the golden section, the division beloved of artists and designers in which the whole is to the longer part as the longer is to the shorter, both ratios equal to φ = (1+√5)/2 ≈ 1.618 — so 100 splits into a 61.8 longer segment and a 38.2 shorter one — and can also extend a single segment to its larger or smaller golden partner. The rectangle endpoint gives the other side and the area of a golden rectangle from either side, the shape that leaves a smaller golden rectangle when you remove a square. The scale endpoint builds a modular (typographic) scale — base · ratio^step across a range of steps up and down — for harmonious type sizes and spacing, taking a numeric ratio or a named musical one such as minor-third (1.2), major-third (1.25), perfect-fourth (1.333) or golden (φ); a 16-base major-third scale gives 16, 20, 25, 31.25 and so on. Lengths are unit-agnostic. Everything is computed locally and deterministically, so it is instant and private. Ideal for graphic-design, web-design, UI, typography, layout and architecture app developers, type-scale and proportion tools, and design systems. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is proportion and scale; for pixel-density and print sizing use a PPI/DPI API.
api.oanor.com/goldenratio-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 79 ms
- Server probes · 24h
- Subscribers
- 4,978
- active
- Total calls
- 76
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 6,400 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 6,400 calls/month
- 2 req/sec
- Golden section + rectangle + type scale
- No credit card
Starter
€4.95 /month
- 64,000 calls / month
- 6 requests / second
- Hard cap (429 above quota, no overage)
- 64,000 calls/month
- 6 req/sec
- Named ratios, multi-step scales
- Email support
Pro
€13.70 /month
- 295,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- 295,000 calls/month
- 15 req/sec
- Design-system & tooling pipelines
- Priority support
Mega
€43.50 /month
- 1,560,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 1,560,000 calls/month
- 40 req/sec
- Platform scale
- Dedicated SLA
Built by
Related APIs
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Modular Scale API
Generate a modular (geometric) scale for typography and spacing. Pick a base size and a ratio — a named musical interval (minor-second, major-second, minor-third, major-third, perfect-fourth, augmented-fourth, perfect-fifth, minor-sixth, golden, major-sixth, minor-seventh, major-seventh, octave and more), a plain number like 1.25, or an interval written as 3:2 — and the scale endpoint returns a harmonious set of sizes stepping up and down from the base, where each value is base × ratio^step (step 0 is the base). Choose how many steps above and below, the rounding, and an optional unit suffix (px, rem, em) so the values come back ready to paste into CSS or design tokens. The ratios endpoint lists every named ratio with its decimal value. A modular scale gives type, spacing and layout a consistent rhythm instead of arbitrary pixel values. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This produces a numeric size scale; for colour scales and gradients use the Gradient API.
api.oanor.com/modularscale-api
Fonts API
The Google Fonts catalogue as an API — 1,900+ open-source font families with everything you need to pick and embed a typeface. Look up a family (e.g. Roboto → category, available weights, variable-font axes, subsets and a ready-to-use CSS embed URL); search by name, category (Sans Serif, Serif, Display, Handwriting, Monospace), subset, weight or variable-font support; or list the most popular families. Each record carries the weights/styles, variable axes (wght, wdth, …), language subsets, designers, popularity rank and a Google Fonts CSS2 embed URL. Ideal for design tools, website builders, font pickers and theming systems.
api.oanor.com/fonts-api
Wallhaven API
Live wallpaper-community data from Wallhaven as an API — search the large community wallpaper collection by keyword and category (general, anime, people), sorted by favourites, views or freshness, and read any wallpaper's community engagement (favourites and views) along with its resolution, aspect ratio, file type, dominant colours and tags. The visual-community engagement layer for wallpaper, design and dashboard apps. SFW-only by design — every request is forced to safe content. Live, no key, no cache. Distinct from generic image and stock-photo APIs — this is Wallhaven's own community wallpapers, their favourites/views engagement and tags.
api.oanor.com/wallhaven-api
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The Victoria and Albert Museum (V&A) collection as an API — over 1.2 million objects spanning 5,000 years of art, design and performance, from textiles, ceramics and furniture to fashion, photographs, prints and jewellery. Search and filter the collection by keyword, maker, place of origin or material/technique, optionally limited to objects that carry an image. Fetch any object by its system number for the full record: title, makers, production date, place, materials and techniques, categories and styles, gallery location and high-resolution IIIF imagery. Browse every work by a given maker (e.g. William Morris), or pull a random object. Real museum data, no key needed upstream. Ideal for art and design apps, galleries and slideshows, education and cultural research.
api.oanor.com/vam-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Golden Ratio & Scale API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Golden Ratio & Scale API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Golden Ratio & Scale 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 Golden Ratio & Scale API cost?
Golden Ratio & Scale API has a free tier with 100 calls / month. Paid plans start at €4.95 / 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 Golden Ratio & Scale API GDPR-compliant?
All requests to Golden Ratio & Scale 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/goldenratio-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/goldenratio-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/goldenratio-api/SOME_PATH");
curl_setopt($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/goldenratio-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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