← SEO Score API

Free SEO API

A genuinely free SEO API: 20 audits a month, each scored on 50+ checks and returned as JSON, no credit card. Get an API key in seconds — upgrade only when you scale.

Most "free" SEO APIs are a 14-day trial or a demo that expires the moment you build anything real on it. SEO Score API has a free tier that just stays free: send a URL, get back a score built from 50+ checks as JSON, no credit card, no sales call. It's the same audit engine the paid plans use. The free response shows 2 checks per category and the top 2 fixes; paid plans return every check and fix.

One call

curl -H "X-API-Key: YOUR_KEY" \
  "https://seoscoreapi.com/audit?url=https://example.com"

Or with the Python SDK (pip install seoscoreapi):

from seoscoreapi import audit

result = audit("https://example.com", api_key="YOUR_KEY")
print(result["score"], result["grade"])

What you get on the free tier

• 20 audits a month, every month — no trial clock, no card required to start.
• A score built from 50+ checks across on-page SEO, technical SEO, social/Open Graph, performance, and accessibility, plus AI Readability: the same engine as the paid plans.
• Scored JSON — an overall 0–100 score, five category sub-scores your code can threshold on, 2 checks per category in detail and the top 2 priority fixes. Paid plans return every check and fix.
• An AI Readability score on every audit.
• Official SDKs for Python, Node, Go, n8n, and a GitHub Action — wire the free API into a script or a pipeline in minutes.

When free is enough — and when to upgrade

20 audits a month is enough to build and test a deploy gate, spot-check a client page, or evaluate the API before you commit. When you need to audit a whole sitemap, run scheduled monitoring, or batch thousands of URLs, paid plans start at $5/mo for 200 audits and scale to 25,000/mo — and add SXO/AEO/AIO scores. No re-integration: the same key and endpoints, just a higher ceiling.

Related reading

Frequently asked

Is there really a free SEO API with no credit card?

Yes. The free tier gives you 20 audits a month with no credit card and no trial expiry. You create a key and start calling the API immediately.

What's the difference between the free tier and paid plans?

The core engine is identical: the free tier scores each page on 50+ checks (on-page SEO, technical, social, performance, accessibility, plus AI Readability), and the response details 2 checks per category and the top 2 fixes. Paid plans return every check and fix, add 28 SXO/AEO/AIO checks (80+ in total), history, batch audits and higher monthly audit and rate limits.

Can I use the free SEO API in production or commercially?

Yes, within the free-tier limits (20 audits a month). Many users run the free tier to try a CI gate on one site; when you need more than that or batch audits, plans start at $5/mo.

What format does the free SEO API return?

JSON: an overall score and grade, five category sub-scores, an AI Readability breakdown, and for each check shown a machine-readable status and the value found.