Critical CSS Bot
recommended: observe
Operated by Critical CSS
other
We operate a SASS for website optimisations, we have thousands of customers. Some of them use Cloudflare but I don't have access to any exact list.
How to identify it
User-agent contains any of:
Criticalcss.com/
robots.txt
Well-behaved crawlers honor robots.txt. To control Critical CSS Bot:
Allow full access
User-agent: Criticalcss.com/
Allow: /Block entirely
User-agent: Criticalcss.com/
Disallow: /
Grey-area scrapers ignore robots.txt. Botscope enforces your policy at the edge or origin regardless —
see how →
See Critical CSS Bot on your own site
Botscope shows every bot and AI agent hitting your site — and lets you allow, challenge, or block each one. Observe first, enforce when you're ready.
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