SEO Audit with Evidence, Ranked Fixes & SaaS Score

Give it a URL and get an explainable technical SEO audit as JSON. Every point taken off the score maps to an issue code with the evidence that triggered it, and every issue comes with a ranked fix: what to change, why, expected impact, effort, confidence and how to check that the fix worked.

It fetches plain HTML over HTTP. No browser, no proxy, no third-party SEO database, so a page takes about a second and costs cents.

Want to see a report first? Audit one page free in the browser, no account needed, at SEO Audit Lab.

What you get

• Two separate scores, 0–100 with a letter grade. Core SEO health across eight weighted categories, and SaaS acquisition and conversion readiness (value proposition, call to action, trust, product evidence).
• Issues with evidence. Code, category, severity, score penalty and the data that triggered it.
• Fixes in priority order. Action, reason, impact, effort, confidence and a validation step for each.
• Fetch and indexability. Status, redirect chain, robots directives, canonical consistency.
• On-page. Title, description, heading outline, content statistics and top terms, internal and external links, image alt and dimension coverage.
• Social and structured data. Open Graph, Twitter card, JSON-LD inventory, language and mobile signals.
• Page type detection for SaaS sites. Pricing, feature, use case, integration, comparison, alternative, docs, case study and more.
• Site-level findings in Site audit mode. Broken internal links, exact duplicate titles, descriptions and content, orphan candidates, the most linked pages and coverage of seven SaaS strategy pillars.

Modes

Mode	Use it for	Items in the dataset	Charged as
page	A full report for each URL	one page item per URL	page-audited
quick	Scoring long URL lists, lead qualification	one quick item per URL	quick-score
site	A bounded crawl of a whole site	one page item per crawled page, then one site summary	page-audited per page, summary free

A URL that cannot be fetched (DNS failure, timeout, not HTML, blocked by the target) becomes an error item and is not charged.

Input

{
  "urls": ["https://example.com"],
  "mode": "site",
  "maxPages": 25,
  "maxDepth": 3,
  "useSitemap": true,
  "respectRobots": true,
  "includeSubdomains": false
}

Field	Type	Default	Notes
urls	array of strings	–	Required. Up to 1,000. example.com is read as https://example.com. In site mode each URL starts its own crawl.
mode	page, quick, site	page	See the table above.
maxPages	integer 1–100	25	site mode: pages fetched and charged per start URL.
maxDepth	integer 0–8	3	site mode: link depth from the start URL. Sitemap URLs are sampled regardless of depth.
useSitemap	boolean	true	site mode: read robots.txt and XML sitemaps.
respectRobots	boolean	true	site mode: skip disallowed pages.
includeSubdomains	boolean	false	Count subdomains as the same site.

Output

Every item has type, url and, when a page was fetched, title, status_code, seo_score, seo_grade, saas_score, saas_grade and issue_count, so the Overview table works across modes.

quick item

Real output for https://example.com, recommendations shortened to the first of five:

{
  "type": "quick",
  "url": "https://example.com/",
  "title": "Example Domain",
  "status_code": 200,
  "seo_score": 77.8,
  "seo_grade": "C",
  "saas_score": 67.2,
  "saas_grade": "D",
  "issue_count": 12,
  "page_type": { "type": "home", "confidence": 1.0, "evidence": ["root path"] },
  "warnings": [
    "No canonical hint found",
    "Title may be too generic",
    "Meta description is missing",
    "No H1 heading found",
    "Page may not fully satisfy its inferred intent",
    "No crawlable internal links",
    "Open Graph preview is incomplete",
    "No organization or software entity JSON-LD detected",
    "No clear primary value proposition detected",
    "No transactional SaaS CTA detected",
    "No trust or customer-proof language detected",
    "No obvious product visual detected"
  ],
  "top_recommendations": [
    {
      "code": "fix.links.no_internal_links",
      "priority": 90,
      "impact": "high",
      "effort": "low",
      "confidence": 1.0,
      "title": "No crawlable internal links",
      "action": "Add contextual HTML links to the next useful pages, using descriptive anchor text.",
      "why": "Important pages should connect users and crawlers to related content and product journeys.",
      "validation": "Deploy the change, re-run the analyzer, and verify that `links.no_internal_links` is resolved; for content or conversion changes, also compare first-party search and conversion data.",
      "affected_pages": 1,
      "issue_codes": ["links.no_internal_links"]
    }
  ]
}

page item

The headline fields plus the full report. Real output for https://example.com, shortened where marked with …:

{
  "type": "page",
  "url": "https://example.com/",
  "title": "Example Domain",
  "status_code": 200,
  "seo_score": 77.8,
  "seo_grade": "C",
  "saas_score": 67.2,
  "saas_grade": "D",
  "issue_count": 12,
  "schema_version": "2.0",
  "requested_url": "https://example.com/",
  "final_url": "https://example.com/",
  "page_type": { "type": "home", "confidence": 1.0, "evidence": ["root path"] },
  "indexability": {
    "indexable": true,
    "status_allows_indexing": true,
    "noindex": false,
    "robots_meta": [],
    "googlebot_meta": [],
    "x_robots_tag": null,
    "canonical": null,
    "canonical_count": 0,
    "canonical_is_self": false
  },
  "score": {
    "overall": 77.8,
    "grade": "C",
    "rating": "fair",
    "categories": {
      "indexability": 92.0,
      "on_page": 54.0,
      "content": 82.0,
      "links": 55.0,
      "technical": 100.0,
      "structured_data": 88.0,
      "media_social": 90.0,
      "delivery": 100.0
    },
    "weights": {
      "indexability": 0.2,
      "on_page": 0.2,
      "content": 0.2,
      "links": 0.15,
      "technical": 0.1,
      "structured_data": 0.05,
      "media_social": 0.05,
      "delivery": 0.05
    },
    "methodology_version": "2026.1"
  },
  "issues": [
    {
      "code": "description.missing",
      "category": "on_page",
      "severity": "medium",
      "title": "Meta description is missing",
      "explanation": "Search engines can generate snippets from content, but a unique description gives a useful page-specific pitch when selected.",
      "recommendation": "Add a concise, accurate summary with the page's differentiator and next step.",
      "evidence": {},
      "penalty": 18.0,
      "impact": "medium",
      "effort": "low",
      "confidence": 1.0,
      "direct_ranking_factor": null
    },
    "… 11 more"
  ],
  "recommendations": ["… 12 ranked fixes, same shape as in the quick item"],
  "…": "also: analyzed_at, fetch, metadata, headings, content, links, images, social, structured_data, international, mobile, performance, saas, limitations"
}

In site mode each page item also carries crawl: { "source": "internal_link", "depth": 1, "inlinks_from_sample": 4, "opportunity_score": 10 }.

site item

One per start URL, after its pages. Real output for a four-page site, shortened:

{
  "type": "site",
  "url": "https://overtidskalkulator.no/",
  "seo_score": 99.6,
  "seo_grade": "A",
  "pages_audited": 4,
  "sample": {
    "max_pages": 25,
    "pages_audited": 4,
    "urls_discovered": 4,
    "sitemap_urls": 4,
    "blocked_by_robots": 0,
    "fetch_failures": 0,
    "page_budget_reached": false,
    "truncated": false
  },
  "saas_strategy": {
    "score": 4.8,
    "maturity": "foundational",
    "page_type_distribution": { "home": 2, "other": 2 },
    "pillars": { "commercial_foundation": { "score": 33.3, "opportunity": "Build or make discoverable homepage, pricing, and feature/product pages; each page must add unique user value." }, "…": "6 more pillars" }
  },
  "architecture": { "broken_internal_edges": [], "broken_pages": [], "orphan_candidates": [], "top_linked_pages": ["…"] },
  "duplicates": { "titles": [], "descriptions": [], "exact_content_signatures": [] },
  "issues": [
    {
      "code": "saas.transactional_cta_missing",
      "title": "No transactional SaaS CTA detected",
      "category": "saas_conversion",
      "severity": "high",
      "count": 2,
      "urls": ["https://overtidskalkulator.no/", "https://overtidskalkulator.no/om"]
    },
    "… 5 more"
  ],
  "recommendations": ["… 13 ranked fixes with affected URLs"],
  "…": "also: schema_version, audited_at, site, requested_url, score, pages, rankings, technical_assets, crawl_errors, out_of_scope_redirects, robots_blocked_urls, limitations"
}

error item

{
  "type": "error",
  "url": "https://no-such-host.invalid",
  "error": { "code": "dns_resolution_failed", "message": "DNS resolution failed for no-such-host.invalid" }
}

Pricing

Pay per event. There is no monthly rental, and platform usage is included in the event price.

Event	Price	When
page-audited	$0.02	Each page returned as a page item, in page and site modes
quick-score	$0.005	Each URL returned as a quick item
Actor start	$0.00005	Once per run

Not charged: error items and the site summary.

Run	Cost
Full report for one page	$0.02
Site audit, 25 pages	$0.50
Site audit, 100 pages	$2.00
Quick score for 1,000 URLs	$5.00

If you set a maximum charge for the run, the Actor checks it before fetching: a site crawl is capped at the number of pages the limit pays for, and a URL list stops at the last URL it covers.

What it does not do

• It does not execute JavaScript. Content that only appears after client-side rendering is not seen.
• It does not predict Google positions, traffic or revenue. Scores are diagnostics, and the weights and limitations are returned with them.
• It has no keyword, backlink or SERP database.
• It does not measure Core Web Vitals. Timing covers the HTML response only.
• It does not rotate proxies or solve bot challenges. Sites that block data-centre traffic or need a login return an error item.
• A site audit is a bounded sample of up to 100 pages per start URL, not an exhaustive crawl.

How it crawls

• Identifies itself as SaaSSEOAnalyzer/2.0 and follows robots.txt rules for the SaaSSEOAnalyzer user agent unless respectRobots is off.
• Up to 5 concurrent requests per site, 12 seconds per request, 3 MB per response, 5 redirects.
• Refuses private, loopback and link-local addresses, including after redirects.

FAQ

How is the score calculated? Eight categories (indexability, on-page, content, links, technical, structured data, media and social, delivery) are scored 0–100 and combined with the weights returned in score.weights. Each issue lists its penalty. The method is documented in METHODOLOGY.md.

Why is the SaaS score separate? A page can be technically clean and still give a visitor no reason to sign up. Mixing the two would hide both. saas_score is null on pages where it does not apply, such as legal or contact pages.

Can I audit sites I do not own? Yes, any public page. Keep respectRobots on for them.

Does a redirected URL count twice? No. A URL is one item, reported under its final address with the redirect chain in fetch.redirects.

Is the analyzer open source? Yes, MIT: KovalDenys1/SEO-Analyzer-API. Bug reports go to the Issues tab here or on GitHub.