AhrefsBot vs SemrushBot

Compare Ahrefs' AhrefsBot and Semrush's SemrushBot — the two most active SEO tool crawlers building commercial backlink and keyword databases.

AhrefsBot

Ahrefs

SemrushBot

Semrush

Category
SEO Scrapers
SEO Scrapers
Vendor
Ahrefs
Semrush
UA Patterns
AhrefsBot, ahrefsbot
SemrushBot, semrushbot
robots.txt
Respects robots.txt
Respects robots.txt
Description
Ahrefs' SEO crawler building the world's largest backlink database.
Semrush's SEO crawler for competitive analysis and backlink tracking.

Analysis

AhrefsBot and SemrushBot are the most active SEO crawlers on the web. AhrefsBot builds one of the world's largest backlink indexes and tends to crawl more aggressively. SemrushBot feeds Semrush's competitive analysis, keyword research, and site audit tools with moderate crawl rates.

Neither provides direct SEO benefit — they build commercial databases. Blocking both reduces server load from SEO tool crawling without affecting search rankings. If you use one of these tools, consider keeping that crawler allowed for more accurate data about your own site.

When to manage AhrefsBot

Allow AhrefsBot if you use Ahrefs tools and want accurate backlink data for your site. Block if bandwidth is a concern — it can be aggressive.

How to block AhrefsBot

When to manage SemrushBot

Allow SemrushBot if you use Semrush for competitive analysis. It's generally lighter on servers than AhrefsBot.

How to block SemrushBot

Manage both with Switch

Switch detects AhrefsBot, SemrushBot, and 40+ other AI agents in real-time. Build custom journeys for each — block, challenge, serve markdown, or redirect. Five-minute setup, no server changes.

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