AI-powered quality scores for any URL or article — readability, keyword density, and actionable suggestions in one call.
A–F letter grade with 0–100 score for quick quality benchmarking.
Flesch-Kincaid grade level and readability score with improvement tips.
Top keyword extraction with stuffing-risk detection and focus keyword support.
5+ specific improvements your writers can act on immediately.
Pass a public URL to fetch-and-score, or send text content directly.
Single API key header. Integrate in minutes.
curl -X POST https://ss-seo-api.duckdns.org/v1/trial \
-H "Content-Type: application/json" \
-d '{"name": "my-app", "email": "you@example.com"}'
curl -X POST https://ss-seo-api.duckdns.org/v1/score \
-H "Content-Type: application/json" \
-H "x-api-key: YOUR_API_KEY" \
-d '{"url": "https://yourblog.com/article", "focus_keywords": ["seo", "content"]}'
{
"overall_score": 72,
"grade": "B",
"readability": { "score": 78, "grade_level": "9th grade" },
"keyword_density": { "risk": "low", "top_keywords": ["seo", "content", "quality"] },
"suggestions": [
"Add more internal links to related posts",
"Expand the introduction to hook readers faster",
"Use more subheadings to improve scannability"
],
"strengths": ["Good keyword placement", "Clear structure"],
"meta": { "input_type": "url", "tier": "free", "requests_remaining": 47 }
}
Subscribe and manage keys via RapidAPI.