01 · Operator
Who operates Sitebulb
- Company
- Sitebulb Limited
- Type
- SEO tool crawler
- Official docs
- sitebulb.com
02 · Behavior
What Sitebulb does
Sitebulb is sold as desktop software and as a cloud service. Users run audits that check pages for hundreds of technical SEO issues. It can render JavaScript during crawls. Traffic comes from the user's machine or Sitebulb's cloud, not from one central bot.
03 · Impact
Why Sitebulb matters for your site
If you allow it
- You or your SEO agency use Sitebulb to audit your site
- Audits can find technical problems
If you block it
- Unknown third parties may audit your site
- Large crawls add server load
04 · Allow
How to allow Sitebulb
robots.txt
User-agent: Sitebulb
Allow: /Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "Sitebulb")
Action: Skip › All Super Bot Fight Mode rules
# Also check Security › Bots: "Block AI bots" can block it regardless of robots.txt.WordPress
# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: Sitebulb
Allow: /nginx
# nginx serves every user agent by default.
# Make sure no rule like this blocks it:
# if ($http_user_agent ~* "Sitebulb") { return 403; }Apache
# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} Sitebulb [NC]
# RewriteRule .* - [F,L]05 · Block
How to block Sitebulb
Start with robots.txt. If Sitebulb keeps showing up in your logs, block it at your CDN or web server.
robots.txt
User-agent: Sitebulb
Disallow: /Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "Sitebulb")
Action: BlockWordPress
# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: Sitebulb
Disallow: /nginx
# In your server { } block:
if ($http_user_agent ~* "Sitebulb") {
return 403;
}Apache
# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Sitebulb [NC]
RewriteRule .* - [F,L]
</IfModule>06 · User agents
User agents we see for Sitebulb
The operator does not publish a full user agent string. Requests contain the token “Sitebulb”.
07 · Verification
Is it really Sitebulb?
Sitebulb’s operator publishes no IP ranges or hostnames, so requests cannot be verified. Treat the user agent as a claim, and watch your logs for unusual request rates.
FAQ
Questions about Sitebulb
What is Sitebulb?
Sitebulb is a website crawler for SEO audits from Sitebulb Limited. It is available as desktop software and as a cloud version.
Can Sitebulb render JavaScript?
Yes. Sitebulb offers JavaScript crawling, so it can audit sites that rely on client-side rendering.
Why is Sitebulb crawling my site?
Someone using Sitebulb has started an audit of your site. This may be your own team, an agency or a competitor.
Last reviewed Oct 8, 2026