Which websites block Perplexity-User?

27 of 243 popular sites we measured block Perplexity-User (11.1%), checked 2026-10-01.

Perplexity-User is Perplexity’s crawler for on-demand citation fetch (Perplexity). It fetches pages so an answer can cite them, so blocking it removes a site from those answers as a live source. More about Perplexity-User.

The robots.txt rule

To block it:

User-agent: Perplexity-User
Disallow: /

To allow it explicitly:

User-agent: Perplexity-User
Allow: /

A server or CDN can still refuse the crawler when robots.txt allows it. That is why the checker fetches as the crawler as well as reading the file.

Sites that block Perplexity-User

Check your own site

The free checker runs the same probe on any URL: robots.txt resolved for every AI crawler, then a live fetch as each one, so a CDN or firewall block shows up even when robots.txt looks fine.

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