Pixel density from resolution & diagonal
API · /ppi-api
Screen PPI API
healthy
3,799 Subscribers
Screen and display pixel-density maths as an API, computed locally and deterministically. The ppi endpoint computes the pixels per inch of a display from its resolution and diagonal size — along with the pixels per centimetre, the dot pitch in millimetres, the diagonal in pixels, the total pixels and megapixels, the simplified aspect ratio, and the physical width and height. The size endpoint does the inverse: from a resolution and a known PPI it works out the physical dimensions and diagonal in inches and centimetres. The retina endpoint analyses a display at a viewing distance: it computes the pixels per degree, says whether the display is effectively "retina" (pixels indistinguishable to 20/20 vision, around 60 pixels per degree), and gives the distance at which it becomes retina. Everything is computed locally and deterministically, so it is instant and private. Ideal for display and monitor tools, AV and signage planning, UI and responsive-design work, and hardware comparison sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is screen pixel density; for print resolution and image-to-print sizing use a DPI API.
api.oanor.com/ppi-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 76 ms
- Server probes · 24h
- Subscribers
- 3,799
- active
- Total calls
- 76
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 10,135 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 10,135 calls/month
- 2 req/sec
- PPI + size + retina
- No credit card
Starter
€11.65 /month
- 19,750 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 19.75k calls/month
- 8 req/sec
- Dot pitch + aspect ratio
- Email support
Pro
€31.55 /month
- 247,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 247.5k calls/month
- 20 req/sec
- Display / AV pipelines
- Priority support
Mega
€69.55 /month
- 1,280,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 1.28M calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
Related APIs
Other APIs with overlapping tags.
DPI & Print Size API
Resolution, print-size and pixel-density maths for print, design, photography and screens. The resolve endpoint takes any two of pixels, DPI and physical length and computes the third, returning the size in inches, centimetres, millimetres and points — so you can answer "how big will a 3000-pixel image print at 300 DPI" or "what DPI do I get printing 3000 px at 10 inches". The ppi endpoint computes a screen's pixel density from its resolution and diagonal size, plus the dot pitch in millimetres, the total megapixels and the aspect ratio. The convert endpoint converts a length between pixels, inches, centimetres, millimetres and points (PostScript points, 1/72 inch), using a DPI when pixels are involved. Everything is computed locally and deterministically, so it is instant and private. Ideal for print and prepress, graphic and web design, photography, and screen and display specs. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is DPI and print-size maths; for aspect ratios and resizing use an aspect-ratio API and for general unit conversion use a unit API.
api.oanor.com/dpi-api
Mask API
Mask a value for safe display. The mask endpoint keeps the first and/or last few characters visible and replaces the rest with a mask character — so a card becomes ••••••••••••1111 and an API token becomes sk**********3456 — and can keep separators (spaces and dashes) intact so the value keeps its shape. A dedicated email masker hides the local part (and optionally the domain) while keeping the address recognisable, e.g. j•••••••@example.com. Choose how many characters to reveal and which mask character to use. Perfect for showing the last four digits of a card, partially hiding emails and phone numbers, and masking tokens and account numbers in UIs, receipts and logs. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This masks a known value for display; to find and redact PII inside free text, use a redaction API.
api.oanor.com/mask-api
Programming Languages API
The language definitions GitHub uses to recognise code (the open-source Linguist data) as an API — a clean reference for syntax highlighting, file-type detection, repository dashboards and developer tooling. For each of 800+ languages the API returns its type (programming, markup, data or prose), its brand colour (the hex GitHub paints it), the file extensions associated with it, common aliases, the GitHub language id and the editor (ace) mode. Look a language up by name or alias (golang resolves to Go), reverse-look-up which language(s) own a file extension (.py → Python; .h → C, C++, Objective-C), list the languages of a type, search, or list them all. Distinct from languages-api (ISO 639 human languages) — this is the programming-language reference. Served from memory — always fast.
api.oanor.com/proglang-api
MIME Types API
The canonical MIME / media-type database (the jshttp mime-db used by Express and most of the Node ecosystem: IANA + Apache + nginx), served from memory — no key. Resolve a media type to its file extensions, charset and compressibility; reverse-lookup the media type(s) for a file extension (e.g. png → image/png); and search or list types by source. 2,600+ media types, 1,000+ with file extensions. Lean, predictable JSON. Ideal for upload validation, Content-Type resolution, file-type detection, download handlers and developer tooling.
api.oanor.com/mimetypes-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Screen PPI API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Screen PPI API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Screen PPI 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 Screen PPI API cost?
Screen PPI API has a free tier with 100 calls / month. Paid plans start at €11.65 / 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 Screen PPI API GDPR-compliant?
All requests to Screen PPI 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/ppi-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/ppi-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/ppi-api/SOME_PATH");
curl_setopt($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/ppi-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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