SEO Audit Tool: On-Page SEO Checker and Website Crawler

SEO audit of any URL or a whole site, $0.005 per page: titles, meta descriptions, headings, canonical, noindex, hreflang, Open Graph and Twitter cards, schema.org JSON-LD, image alt text, broken links, redirects, response time and page weight. Every page gets a 0-100 score and a prioritized list of issues, each with a fix. A site summary finds duplicate titles and descriptions, broken links and the issues that hit the most pages.

Deterministic rules, no browser and no AI: the same page always gets the same verdict, so you can run it on a schedule and compare. Works for SEO freelancers and agencies, developers adding an SEO check to CI or monitoring, and AI agents (Claude, ChatGPT, Cursor and others through the Apify MCP server) that need facts about a page before giving advice.

What it checks

Area	Checks
Indexability	HTTP status, redirect chain (every hop), temporary redirects, robots meta tag, X-Robots-Tag header (generic and Googlebot/Bingbot), canonical (HTML and Link header; missing, multiple, invalid, pointing elsewhere), indexable yes/no with the reason
Content	Title (missing, empty, multiple, under 30 / over 60 characters), meta description (missing, multiple, under 70 / over 160), word count and thin content, text-to-HTML ratio, charset, doctype, favicon, URL length and case
Headings	H1 missing / multiple / empty, skipped heading levels, full heading outline
Links	Internal / external / nofollow counts, links without anchor text, pages without internal links, broken links (opt-in)
Images	Images without alt (decorative alt="" is fine), images without width/height (layout shift)
Social	Open Graph (og:title, og:description, og:image), Twitter card
Structured data	JSON-LD blocks parsed, @type values (including @graph), JSON errors with line and column, microdata and RDFa types
International	<html lang>, hreflang codes validated, duplicates, self-reference, x-default
Performance	Server response time, HTML size, compression (gzip/brotli)
Security / mobile	HTTPS, mixed content (http:// images, scripts, styles on https pages), viewport meta tag

Site summary (per site, in the key-value store): average score, score distribution, indexable vs non-indexable pages with reasons, duplicate titles and meta descriptions, top issues ranked by how many pages they affect, broken links with the pages they are on, slowest pages, robots.txt status and declared sitemaps, crawl coverage.

Quick start

Audit one site, 10 pages (the Actor's example; about 15 seconds, about $0.05):

{"startUrls": ["https://www.python.org/"], "maxPages": 10}

Audit a list of URLs without crawling, with a broken-link check:

{"startUrls": ["https://example.com/pricing", "https://example.com/blog/post-1"], "crawl": false, "checkBrokenLinks": true}

One dataset item per page (abridged):

{
  "url": "https://www.example.com/news",
  "finalUrl": "https://www.example.com/news",
  "status": "ok",
  "httpStatus": 200,
  "redirectChain": [],
  "responseTimeMs": 212,
  "htmlBytes": 397198,
  "compressed": true,
  "title": "Example News - Breaking news, video and the latest top stories from around the world",
  "titleLength": 85,
  "metaDescriptionLength": 249,
  "h1": ["News"],
  "canonical": "https://www.example.com/news",
  "robots": {"meta": null, "xRobotsTag": []},
  "indexable": true,
  "indexability": "indexable",
  "structuredData": {"jsonLdBlocks": 1, "jsonLdTypes": ["NewsMediaOrganization", "WebPage"], "jsonLdErrors": []},
  "images": {"total": 48, "missingAlt": 24, "emptyAlt": 0, "missingDimensions": 48},
  "links": {"internal": 241, "external": 7, "nofollowInternal": 0},
  "wordCount": 1714,
  "score": 80,
  "categoryScores": {"content": 84, "images": 84, "indexability": 100, "international": 96},
  "issues": [
    {"id": "TITLE_TOO_LONG", "severity": "medium", "category": "content",
     "message": "The title is 85 characters (over 60).",
     "fix": "Shorten the title to about 60 characters so it is not cut off in results."},
    {"id": "IMAGES_MISSING_ALT", "severity": "medium", "category": "images",
     "message": "24 of 48 images have no alt attribute.",
     "fix": "Add alt text to informative images (alt=\"\" for decorative ones)."}
  ]
}

The site summary is at SITE_SUMMARY in the run's key-value store (also linked in the run's Output tab).

Score

Each page starts at 100. Each issue subtracts by severity: critical 30 (error status, noindex, missing title), high 12 (missing meta description or H1, broken links, mixed content, no HTTPS, no viewport...), medium 6, low 2. The floor is 0. Category scores use the same weights doubled, per category. Issues are sorted most severe first, so issues[0] is what to fix first.

Input

Field	Default	What it does
startUrls	(required)	URLs or domains to audit (HTTPS assumed for domains). Up to 10,000.
crawl	true	Follow links to other pages on the same site.
maxPages	50	Pages per site, start URLs included. Caps the cost per site.
maxDepth	5	Clicks away from the start URL.
includeUrlRegex / excludeUrlRegex		Crawl only / skip URLs matching a regular expression.
checkBrokenLinks	false	Check every link found (HEAD, GET fallback), once per unique URL per run.
maxLinkChecks	500	Upper limit on links checked per run.
saveSiteSummary	true	Write the per-site summary to the key-value store.
maxConcurrency	5	Pages fetched in parallel (each host is still paced).

Pricing in plain words

$0.005 per page audited ($5 per 1,000 pages), $0.0005 per link checked when you turn on the broken-link check, and a $0.001 start fee per run (at the default 512 MB). A 100-page site audit costs about $0.50; with 2,000 unique links checked, $1.50 more. Not charged: invalid URLs, sites that don't exist or don't answer, pages blocked by robots.txt, non-HTML files (PDFs, images). Pages answering 404 or 500 are charged because they are findings. Set a maximum total charge on the run and the Actor stops before exceeding it, still writing the summary.

Crawling rules

• Only the site you give: the start URL's host plus the host it redirects to (for example example.com to www.example.com). Other hosts are never crawled, only link-checked if you ask.
• robots.txt is always obeyed. The Actor identifies itself as TinplateSEOAudit/1.0 (+https://tinplatelabs.github.io); to audit a page your robots.txt blocks, add User-agent: TinplateSEOAudit / Allow: /.
• Requests to one host are paced (at most 4 per second, Crawl-delay honoured up to 3 s).
• Only public websites: hosts that resolve to private or reserved addresses are refused.
• Pages are read as served (no JavaScript rendering). Sites that build their content in the browser show what search engines see before rendering.

Errors

Pages that could not be audited become records with status: "error" and error.code: INVALID_URL, SITE_NOT_FOUND, SITE_UNREACHABLE, TIMEOUT, PRIVATE_ADDRESS, BLOCKED_BY_ROBOTS, NOT_HTML, SPENDING_LIMIT_REACHED. The message says what to do. None of them is charged.

Memory

512 MB (the default) handles sites up to 10,000 pages. Raising memory doesn't make crawls faster, because per-host politeness limits the pace; more maxConcurrency helps only across several sites.

Open-source licenses

Package	License
apify (Apify SDK for Python)	Apache-2.0
httpx	BSD-3-Clause
lxml	BSD-3-Clause

Made by Tinplate Labs. This Actor is maintained without a support channel; the README and error messages are meant to answer every question.