← SEO Score API

Free SEO API

A genuinely free SEO API: 55 checks per URL as scored JSON, free tier with 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 scored breakdown of 55 checks as JSON, no credit card, no sales call. It's the same audit engine the paid plans use — you're rate-limited, not feature-limited.

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

• 2 audits per day, every day — no trial clock, no card required to start.
• All 55 free-tier checks across on-page SEO, technical SEO, social/Open Graph, performance, and accessibility (plus an AI Readability score) — the free tier is not a stripped-down engine, just rate-limited.
• Scored JSON — an overall 0–100 score, five category sub-scores, and per-check results your code can threshold on.
• An AI Readability score on every audit.
• Official SDKs for Python, Node, 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

Two audits a day is plenty to wire up a deploy gate on one site, 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 2 audits per day 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 runs 55 checks (on-page SEO, technical, social, performance, accessibility, plus an AI Readability score). Paid plans add 28 SXO/AEO/AIO checks for 83 total and raise your monthly audit and rate limits. The free tier is rate-limited, not stripped down.

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

Yes, within the free-tier limits (2 audits/day). Many users run the free tier as a CI gate on a single site; when you need higher volume or batch audits, plans start at $5/mo.

What format does the free SEO API return?

JSON. Every one of the 55 free-tier checks returns a machine-readable status, the value found, and why it matters, alongside an overall score and grade.