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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.

#similarity #fuzzy-matching #levenshtein #jaro-winkler #soundex #dedup #dev-tools
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.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
67 ms
Server probes · 24h
Subscribers
4,680
active
Total calls
32
last 7 days
status Full status page → · 32 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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api.oanor.com/geohash-api

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api.oanor.com/pypi-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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