01 · Operator
Who operates A1 Website Analyzer
- Company
- Microsys
- Type
- SEO tool crawler
- Official docs
- microsystools.com
02 · Behavior
What A1 Website Analyzer does
The software crawls a website and reports broken links, redirects, internal linking and anchor text. It also flags duplicate titles and HTML or CSS errors. Scan data can be exported to XML or CSV. Requests come from the computer of whoever runs it.
03 · Impact
Why A1 Website Analyzer matters for your site
If you allow it
- Often run by site owners or their SEO agencies
- Helps find broken links and technical issues
If you block it
- Anyone can run it against any site, including competitors
- Full-site crawls can add load
- Cannot be verified by IP or DNS
04 · Allow
How to allow A1 Website Analyzer
robots.txt
User-agent: A1 Website Analyzer
Allow: /Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "A1 Website Analyzer")
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: A1 Website Analyzer
Allow: /nginx
# nginx serves every user agent by default.
# Make sure no rule like this blocks it:
# if ($http_user_agent ~* "A1 Website Analyzer") { return 403; }Apache
# Apache serves every user agent by default.
# Make sure .htaccess has no rule like this:
# RewriteCond %{HTTP_USER_AGENT} A1 Website Analyzer [NC]
# RewriteRule .* - [F,L]05 · Block
How to block A1 Website Analyzer
Start with robots.txt. If A1 Website Analyzer keeps showing up in your logs, block it at your CDN or web server.
robots.txt
User-agent: A1 Website Analyzer
Disallow: /Cloudflare
# Security › WAF › Custom rules › Create rule
Expression: (http.user_agent contains "A1 Website Analyzer")
Action: BlockWordPress
# WordPress serves a virtual robots.txt. Edit it with your SEO plugin:
# Yoast: SEO › Tools › File editor · Rank Math: General Settings › Edit robots.txt
User-agent: A1 Website Analyzer
Disallow: /nginx
# In your server { } block:
if ($http_user_agent ~* "A1 Website Analyzer") {
return 403;
}Apache
# .htaccess
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} A1 Website Analyzer [NC]
RewriteRule .* - [F,L]
</IfModule>06 · User agents
User agents we see for A1 Website Analyzer
The user agent published by the operator:
A1 Website Analyzer/10.1.4 (+https://www.microsystools.com/products/website-analyzer/)07 · Verification
Is it really A1 Website Analyzer?
A1 Website Analyzer’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 A1 Website Analyzer
What is A1 Website Analyzer?
It is a desktop website crawler by Microsys. It analyzes whole sites for broken links, redirects, duplicate titles and HTML errors.
Why is A1 Website Analyzer crawling my site?
Someone ran the software against your site from their own computer. This may be you, your agency or a third party.
How do I block A1 Website Analyzer?
Match the user agent token A1 Website Analyzer at your server or firewall. Microsys does not document its robots.txt handling on the product page.
Last reviewed Oct 8, 2026