AI companies
CompanyTo train its modelsTo answer people and search
- OpenAIChatGPTTo train its modelsKept out
GPTBotline 14To answer people and searchKept outOAI-SearchBotline 26ChatGPT-Userline 20 - AnthropicClaudeTo train its modelsPartly
ClaudeBotline 11, kept outanthropic-ailet inClaude-Webline 18, kept outTo answer people and searchLet inClaude-SearchBotClaude-User - GoogleGeminiTo train its modelsKept out
Google-Extendedline 19To answer people and searchLet inGoogle-CloudVertexBot - PerplexityTo train its modelsNone namedTo answer people and searchKept out
PerplexityBotline 16Perplexity-Userline 17 - MetaMeta AITo train its modelsLet in
meta-externalagentFacebookBotTo answer people and searchLet inmeta-externalfetchermeta-webindexer - AppleApple IntelligenceTo train its modelsLet in
Applebot-ExtendedTo answer people and searchNone named - AmazonTo train its modelsLet in
AmazonbotTo answer people and searchLet inAmzn-SearchBotAmzn-User - Common Crawlopen data for trainingTo train its modelsLet in
CCBotTo answer people and searchNone named - ByteDanceTo train its modelsPartly
Bytespiderline 29, kept outTikTokSpiderlet inTo answer people and searchNone named - MistralLe ChatTo train its modelsNone namedTo answer people and searchLet in
MistralAI-User
1 of the 27 other AI crawlers we know is kept out: Diffbot.
What it tells AI crawlers
It gives no Content Signals and no “noai” tag.
Like 32% of the 1,691 popular sites whose robots.txt we read in October 2026, it keeps at least one AI training crawler out. How many websites block AI crawlers?
We read the site once, as our named bot: its robots.txt, read as crawlers read it, its home page and the files AI tools ask sites for. What we couldn’t read says so. robots.txt asks and doesn’t enforce: a firewall can treat AI crawlers differently from us.