Free crawler tools for JavaScript SEO and AI visibility
Check what Google, AI crawlers, and social preview bots can actually read from your JavaScript website.
Recommended path
Start with what bots receive.
Use the tools in order when you are diagnosing a JavaScript-heavy site for crawler readability.
Bot View Checker
See what crawler-style requests receive.
Raw vs Rendered HTML
Compare initial HTML with rendered content.
JavaScript SEO Score
Get a simple crawler-readability score.
Robots + llms.txt
Check crawler rules and AI-agent discovery files.
Bulk Readability Scan
Scan up to 10 sitemap or pasted URLs.
Choose the right tool
Match the check to the question.
Browser looks fine, but bots may see less
Use Bot View Checker
Initial HTML looks empty
Use Raw vs Rendered HTML
Need a quick audit score
Use JavaScript SEO Score
Need to check crawler permissions
Use Robots + llms.txt
Need to review several pages
Use Bulk Readability Scan
What these tools check
Crawler access, content, and discovery signals.
What these tools do not guarantee
They diagnose crawler readability and access issues.
They do not guarantee rankings, AI citations, or traffic.
They do not replace a full SEO strategy.
They help confirm whether crawlers can access useful HTML and discovery files.
Next step if crawlers see thin HTML
Serve rendered HTML to crawler requests.
If crawlers receive a thin JavaScript shell, the fix is to serve rendered HTML to crawler requests while visitors continue using the normal site.