AI Visibility Checker

Can AI find, read and cite your page? Paste a URL and get a report on the signals that decide whether search engines and AI assistants (ChatGPT, Claude, Perplexity, Google's AI Overviews) can use it.

Live: https://chaekim-ai-visibility.vercel.app · Built by Chae Kim, with Chris Jackson, my co-founder at Lucent

What it checks

Group	Check	Why it matters
Can AI find it?	Allowed in search	A noindex in the page or its headers keeps it out of search and answers.
	AI and search crawlers	robots.txt rules for 11 crawlers, split into search and live fetching (blocking hurts visibility) and model training (blocking is a choice).
	HTTPS, redirect chain	Served over HTTPS with HTTP redirecting to it; reached in at most one redirect.
	Sitemap	Found in robots.txt or at /sitemap.xml, and whether it lists the page.
	llms.txt	An emerging, optional Markdown guide to a site for AI tools.
Can AI read it?	Readable without JavaScript	Words in the raw HTML. Several AI crawlers don't run JavaScript.
	Title, one main heading, language	The basics a crawler uses to name the page.
	Heading order, image alt text, mobile viewport, mixed content	Structure and assets a crawler can follow and trust.
Can AI understand and cite it?	Structured data	JSON-LD that parses, and the @types it declares.
	Canonical URL	Whether the page names itself as the URL to credit.
	Description, link preview	Meta description; Open Graph title, description and an image that loads.

The score is the share of weighted checks earned (pass = full, improve = half, fix = none). It's a checklist, not a prediction: nothing can guarantee a ranking or a citation.

If a site refuses the checker (HTTP 401, 403, 429 or 503, common on large sites that block unknown bots), it says so and checks only the public files (robots.txt, sitemap, llms.txt) instead of scoring the page 0.

Credits

Built with Chris Jackson, my co-founder at Lucent. The HTTPS and redirect, mobile viewport, image alt text, heading order, redirect chain and mixed content checks come from the SEO audit playbook we built at Lucent, rewritten here as automatic checks.

Safety

The API fetches other people's sites, so it only follows http(s) URLs, resolves every hostname and refuses private, local and link-local addresses on every redirect hop (cloud metadata endpoints included), caps responses at 2 MB, and times out after 8 seconds. It identifies itself as AIVisibilityChecker/1.0 and keeps nothing.

Run it

npm run dev     # http://localhost:5190, page + API, no dependencies
npm test        # robots.txt matching, address blocking, HTML reading, scoring

Deploys to Vercel as static files plus one function, api/check.js (GET /api/check?url=example.com).

Layout

index.html, app.js, style.css   the page
api/check.js                    the endpoint
lib/fetch-safe.js               public-only fetching with limits
lib/robots.js                   robots.txt parsing and RFC 9309 matching, the crawler list
lib/html.js                     reads title, meta, canonical, JSON-LD, headings and text from raw HTML
lib/audit.js                    the checks, scoring and "fix first"