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AI and the web

AI Crawlers vs AI Agents: What's the Difference?

· 6 min read · Widgetail team

An AI crawler collects content in bulk, ahead of time, to build an index or feed AI systems. An AI agent reads pages in real time on behalf of a user or system while completing a task. Both are machines reading your site, but they arrive at different moments, for different reasons.

AI crawlers

A crawler is a program that systematically visits many pages and stores what it finds. Search engines have used crawlers for decades. AI crawlers work the same way but collect content for AI systems, whether to train models, build indexes or supply reference material. Their visits tend to be broad, scheduled and detached from any individual user's request.

Well-behaved crawlers announce themselves with a user-agent string (GPTBot, ClaudeBot and PerplexityBot are examples of declared crawler names) and generally read robots.txt first.

AI agents

An agent is software that uses an AI model to carry out a task for someone: research a topic, compare options, read an article and answer a question. When that task requires reading a web page, the agent fetches it at the moment it is needed, often in response to a specific person's request.

Side by side

  • Timing: crawlers collect ahead of time; agents fetch on demand.
  • Scope: crawlers cover many pages broadly; agents read a few pages relevant to a task.
  • Purpose: crawlers feed indexes and models; agents serve a user's immediate goal.
  • Identity: both may declare themselves; neither is obliged to.
  • Visible in analytics? Usually not. Both often fetch raw HTML without running a page's scripts.

Why the difference matters

How you'd sensibly treat each may differ. You might welcome the agent that fetches one of your pages to answer a person's question and sends credit back, and object to a crawler that copies an entire site for reuse. Or the reverse. A blanket rule can't distinguish them, and that is what makes the policy question hard.

What site owners can do today

  • Set robots.txt rules. They only work if the reader chooses to respect them.
  • Watch your server logs. They show machine traffic that browser analytics never sees.
  • Use network-level controls to limit declared bots.
  • Think about what you'd want: to be excluded, credited or paid, and for which kinds of use.

Where this is heading

The open question is whether there can be a fair way for valuable content to carry an economic signal when machines use it. Widgetail is exploring one angle, pricing access by measured content value, and that work is in development, not live. The full context is in our guide to AI agents and websites.

Who Pays When AI Uses Web Content?There is no single settled answer. Today, machine readers often access public web content without paying, some publishers negotiate individual licenses, and new technical mechanisms for automatic payment are being tried. Who should pay, for what, and how much remains an open question.How Do Websites Make Money Without Ads?Websites make money without ads through subscriptions, memberships, sponsorships, affiliate commissions, selling their own products or services, licensing, and direct support from readers. Most combine several. The best fit depends on your audience and on what your content helps people do.

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