Perplexity

Perplexity-User

Class: User fetch
robots.txt: Ignores robots.txt; Perplexity: "generally ignores" robots.txt rules.
Evidence: Confirmed from operator documentation; Source

Published User-Agent

Mozilla/5.0 (compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)

Proving it is real

robots.txt

User-agent: Perplexity-User
Disallow: /

Cloudflare custom rule expression

(http.user_agent contains "Perplexity-User")

nginx

if ($http_user_agent ~* "Perplexity-User") {
    return 403;
}

Matching a name only blocks bots that tell the truth about it. Before you do this, read what each decision costs.

Last reviewed Nov 2, 2026