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API · /textdiff-api

Text Diff API

healthy 3,962 Subscribers

Compare two pieces of text and get a precise, structured diff. Choose line, word or character granularity for a full edit script (equal, inserted, deleted) with addition and deletion counts, get a compact inline word diff, or render a standard unified diff (patch) with configurable context lines and file labels — ready to feed into patch tooling or a code-review UI. Built on a Longest-Common-Subsequence algorithm for accurate, minimal diffs. Every endpoint works by GET or JSON POST and runs entirely server-side with no third-party upstream, so responses are instant and the service is always available. Ideal for code review and version tooling, CMS and document editors, change tracking, plagiarism highlighting and content audits.

#diff #text #compare #patch #dev-tools #merge
api.oanor.com/textdiff-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
70 ms
Server probes · 24h
Subscribers
3,962
active
Total calls
12
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 500 calls / month
  • 1 requests / second
  • Hard cap (429 above quota, no overage)
  • 500 requests/month, 1 req/s
  • Line, word & character diff
  • Unified diff (patch) output
  • No credit card
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Basic

€2.00 /month

  • 20,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 20,000 requests/month, 5 req/s
  • Inline word diff & edit script
  • Addition/deletion stats
  • Commercial use, email support
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Pro

€6.00 /month

  • 150,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 150,000 requests/month, 15 req/s
  • High-volume diffing
  • Configurable patch context
  • Priority email support
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Mega

€15.00 /month

  • 1,000,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,000,000 requests/month, 40 req/s
  • CI & editor-integration scale
  • Maximum concurrency
  • Priority support
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Text Diff API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Text Diff API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Text Diff 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 Text Diff API cost?
Text Diff API has a free tier with 100 calls / month. Paid plans start at €2.00 / 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 Text Diff API GDPR-compliant?
All requests to Text Diff 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/textdiff-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/textdiff-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/textdiff-api/SOME_PATH");
curl_setopt($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/textdiff-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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