How to Block DuckAssistBot: DuckDuckGo's AI Answer Crawler
DuckDuckGo built its brand on privacy — then deployed a crawler to read your pages and generate AI answers. DuckAssistBot powers DuckAssist and Duck.ai. Here's how to block it without losing your DuckDuckGo search ranking.
Updated March 2026
DuckDuckBot ≠ DuckAssistBot
DuckDuckGo operates two separate crawlers. Blocking one does not affect the other:
DuckDuckBotMain search index crawler. Builds DuckDuckGo's search results. Blocking removes your site from DuckDuckGo search entirely.DuckAssistBotAI answer crawler. Fetches pages to generate AI summaries for DuckAssist and Duck.ai features. Blocking only removes you from AI answers.What Does DuckAssistBot Do?
When a DuckDuckGo user searches for something that triggers an AI-generated answer, DuckAssistBot fetches relevant web pages to generate that answer. This powers two features:
AI-generated summaries that appear above search results for certain queries. These are sourced from Wikipedia and other web pages.
DuckDuckGo's standalone AI chat product where users can ask questions and get AI-powered answers with web sources.
DuckAssistBot is a retrieval crawler, not a training crawler. It fetches pages on demand to answer specific queries — it doesn't bulk-harvest content for model training. This makes it functionally similar to ChatGPT-User or Gemini-Deep-Research.
The user agent string is: DuckAssistBot/1.0 (+https://duckduckgo.com/duckassistbot)
How to Block DuckAssistBot in robots.txt
Add this to your robots.txt to opt out of DuckDuckGo's AI answers:
# Block DuckDuckGo AI answers User-agent: DuckAssistBot Disallow: / # Keep DuckDuckGo search indexing (do NOT block DuckDuckBot unless intended) # User-agent: DuckDuckBot # Disallow: /
# Block both search indexing and AI answers User-agent: DuckDuckBot Disallow: / User-agent: DuckAssistBot Disallow: /
Don't confuse the bot names
DuckDuckBot = search index (blocking kills your DuckDuckGo rankings). DuckAssistBot = AI answers only. Make sure you're blocking the right one.
The Privacy Irony
DuckDuckGo's brand is built entirely on privacy — "the search engine that doesn't track you." But that promise is to users, not publishers. DuckAssistBot accesses your content to serve DuckDuckGo users without your explicit consent, monetization opportunity, or even a guaranteed attribution link.
This isn't unique to DuckDuckGo — every search engine crawler does something similar. But it's worth noting that the company most vocal about respecting user consent operates a crawler that reads publisher content to generate AI summaries that may reduce click-through traffic.
What Blocking Does (and Doesn't) Do
- • Your content appearing in DuckAssist AI summaries
- • Your pages being used as sources in Duck.ai answers
- • DuckAssistBot fetching your content on demand
- • Your rankings in DuckDuckGo search (unaffected)
- • Other AI crawlers (GPTBot, ClaudeBot, etc.)
- • Google or Bing rankings
- • DuckDuckGo displaying your site in regular search results
Frequently Asked Questions
Is DuckAssistBot a training crawler?
No. DuckDuckGo has not indicated that DuckAssistBot collects data for AI model training. It's a retrieval crawler — it fetches pages in real-time to generate answers for specific user queries. However, the exact disposition of retrieved content is not fully documented.
How much traffic does DuckDuckGo actually drive?
DuckDuckGo has approximately 100 million daily searches. Its market share is small compared to Google, but its users tend to be privacy-conscious tech professionals — often a high-value demographic for B2B and tech content publishers.
Should I block DuckAssistBot if I block GPTBot?
Not necessarily. GPTBot collects training data; DuckAssistBot retrieves content for live AI answers. Some publishers block all AI activity as a matter of principle. Others distinguish between training crawlers (block) and AI search/retrieval (allow, because it drives traffic). It depends on your content strategy.
Does DuckAssistBot respect robots.txt?
Yes. DuckDuckGo has a strong public commitment to publisher norms and has documented DuckAssistBot with a verifiable help URL. A robots.txt block is sufficient.
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