API · /similarity-api

String Similarity API

healthy 4,680 Subscribers

A fast, fully-local string similarity and fuzzy-matching toolkit: edit distances (Levenshtein, Damerau-Levenshtein, Hamming), normalized 0-1 similarity scores (Levenshtein ratio, Jaro, Jaro-Winkler, Dice and Jaccard), Soundex phonetic codes, and best-match ranking of a query against a candidate list. Every endpoint accepts input via the query string or the request body. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for record matching and deduplication, search and autocomplete, spell-checking, data cleaning and entity resolution.

api.oanor.com/similarity-api
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Machine-readable spec so AI agents can integrate this API.

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

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

String Similarity API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
79 ms
Server probes · 24h
Subscribers
4,680
active
Total calls
76
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 16,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 16,000 calls/month, 3 req/s
  • All distance & similarity metrics (Levenshtein, Jaro-Winkler, Dice, Jaccard, Soundex)
  • No credit card
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Basic

€5.00 /month

  • 280,000 calls / month
  • 12 requests / second
  • Hard cap (429 above quota, no overage)
  • 280,000 calls/month, 12 req/s
  • All single-pair metrics + Soundex phonetic codes
  • Commercial use allowed
  • Email support
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Pro

€15.00 /month

  • 1,500,000 calls / month
  • 35 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,500,000 calls/month, 35 req/s
  • Adds batch best-match ranking (query vs candidate list)
  • Body + query-string input
  • Priority email support
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Mega

€40.00 /month

  • 7,500,000 calls / month
  • 120 requests / second
  • Hard cap (429 above quota, no overage)
  • 7,500,000 calls/month, 120 req/s
  • Full endpoint set, high-throughput batch ranking
  • Best for dedup / entity-resolution pipelines
  • Priority support
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Built by

Related APIs

Other APIs with overlapping tags.

Soundex & Fuzzy Match API — oanor API marketplace

Soundex & Fuzzy Match API

Phonetic and fuzzy string-matching maths as an API, computed locally and deterministically. The soundex endpoint computes the American Soundex code of a word — the first letter followed by three digits that encode its consonant sounds, ignoring case and non-letters and applying the vowel-reset and adjacent-duplicate rules — so Robert and Rupert both code to R163, Smith and Smyth to S530, and the classic tricky cases Ashcraft (A261), Tymczak (T522) and Pfister (P236) come out right. The levenshtein endpoint computes the edit distance between two strings (the minimum insertions, deletions and substitutions, optionally case-sensitive) and a 0–100 % similarity, so kitten → sitting is three edits and about 57 % similar. The compare endpoint combines both: it reports whether two strings share a Soundex code (sound alike) and their Levenshtein similarity (spelled alike), and flags a likely match when the codes agree or the similarity is at least 80 %. Everything is computed locally and deterministically, so it is instant and private. Ideal for data-deduplication, CRM, fuzzy-search, autocomplete, genealogy and data-cleaning app developers, name-matching and record-linkage tools, and search software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is phonetic and edit-distance matching; for full-text search use a search API.

api.oanor.com/soundex-api

Quiz & Trivia API — oanor API marketplace

Quiz & Trivia API

A ready-to-use trivia engine with more than 44,000 multiple-choice questions across 20 categories — animals, brain teasers, celebrities, entertainment, kids, general knowledge, geography, history, hobbies, humanities, literature, movies, music, people, religion, science & technology, sports, television, video games and world. Pull a random question or a batch (optionally filtered by category, with the answer hidden for gameplay and the options shuffled), fetch a specific question by id, verify a submitted answer, search questions by keyword, and list every category with its question count. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side data (no third-party upstream), so responses are instant and always available. Ideal for quiz and trivia games, pub-quiz and party apps, learning tools, chatbots and Discord/Slack bots.

api.oanor.com/quiz-api

Face Detection API — oanor API marketplace

Face Detection API

Detect human faces in an image and analyse each one with on-device machine learning: get the bounding box and a detection confidence, an estimated age, the predicted gender with its probability, and the dominant facial expression together with the full per-expression breakdown (neutral, happy, sad, angry, fearful, disgusted and surprised). A lightweight count endpoint returns just the number of faces and their boxes for fast gating. Supply an image by public URL, base64 or a raw binary request body; only public http/https URLs are accepted and private or internal hosts are blocked, and large images are downscaled automatically. Runs locally on TensorFlow (face-api) — no third-party upstream and no per-image cloud cost — with warm models that keep inference fast. Ideal for photo and avatar apps, audience analytics, smart cameras, auto-cropping and accessibility.

api.oanor.com/facedetect-api

NSFW Detection API — oanor API marketplace

NSFW Detection API

Moderate images automatically with on-device machine learning. Classify any image across five categories — neutral, drawing, sexy, porn and hentai — and receive per-class probabilities, the top class, a combined NSFW score and a clear verdict (safe, questionable or nsfw). A simpler check endpoint returns a single safe/unsafe decision against a threshold you choose, ideal for upload gates and user-generated-content pipelines. Supply an image by public URL, base64 or a raw binary request body; only public http/https URLs are accepted and private or internal hosts are blocked, and large images are downscaled automatically. Runs locally on TensorFlow (NSFWJS / MobileNetV2) — no third-party upstream and no per-image cloud cost — with a warm model that keeps inference fast. Ideal for community platforms, marketplaces, dating and chat apps, and any service that accepts user images.

api.oanor.com/nsfw-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for String Similarity API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call String Similarity API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for String Similarity 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 String Similarity API cost?
String Similarity API has a free tier with 100 calls / month. Paid plans start at €5.00 / 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 String Similarity API GDPR-compliant?
All requests to String Similarity 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/similarity-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/similarity-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/similarity-api/SOME_PATH");
curl_setopt($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/similarity-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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