Top 100 / nature.com
Two different webs
2 of 14 AI agents get the full page at https://nature.com/. Checked 2026-09-25 09:19 UTC.
nature.com scores 52 out of 100 for machine visibility, number 81 of the 100 most visited websites checked on 2026-09-25. 2 of 14 AI agents receive the full page: 0 of 8 training crawlers, 2 of 3 AI search indexes and 0 of 3 assistant fetchers. 10 are refused in robots.txt and 1 is refused at the HTTP level. The pattern is "cite me, don't train on me": 8 of 8 training crawlers are refused while 2 of 6 search and assistant fetchers get through. There is no llms.txt.
youfull pagedegradedblockedunknown
Human
- Status
- 200 → https://idp.nature.com/authorize?response_type=cookie&client_id=grover&redirect_uri=https%3A%2F%2Fwww.nature.com%2Fnature
- Title
- Client Challenge
- H1
- none
- Words
- 37
- Scripts
- 1 tags · 1 KB
- Meta robots
- none
- Canonical
- none
- Server
- hidden
Machine
- robots.txt
- 23 groups · 5 sitemaps
- llms.txt
- missing
- llms-full.txt
- missing
- X-Robots-Tag
- none
- Blocked
- Google-Extended, GPTBot, ChatGPT-User, ClaudeBot, PerplexityBot, Perplexity-User, Applebot-Extended, Meta-ExternalAgent, Amazonbot, Bytespider, CCBot
- Degraded
- Claude-User
- Challenged
- none
Gaps
- high11 of 14 AI agents are blockedAssistants asked about this page will guess, or cite someone else. Deliberate for a paywalled publisher. Otherwise this is the biggest gap on the list.
- medium1 agents get a degraded pageClaude-User: Different content than humans receive
- lowVery little text in the raw HTML37 words. Thin for both humans and machines.
- lowNo llms.txtOptional, but a short curated index at /llms.txt is the cheapest way to tell assistants what matters on this site.
Every agent
| Agent | Type | robots.txt | Fetch | Words | Result |
|---|---|---|---|---|---|
| Human (Chrome)You | Human | allowed | 2001423 ms | 37 | visible HTTP 200, 37 words |
| GooglebotGoogle · Classic search index. Also feeds AI Overviews. | Search engine | allowed | 2001003 ms | 37 | visible HTTP 200, 37 words |
| Google-ExtendedGoogle · Robots-only token controlling Gemini training use. Never fetches on its own. | AI training | disallowedDisallow: / | n/a | blocked robots.txt Disallow: / (group: Google-Extended) | |
| GPTBotOpenAI · Training crawler for OpenAI models. | AI training | disallowedDisallow: / | 406556 ms | 43 | blocked robots.txt Disallow: / (group: GPTBot) |
| OAI-SearchBotOpenAI · Indexes for ChatGPT search results and citations. | AI search index | allowed | 200556 ms | 37 | visible HTTP 200, 37 words |
| ChatGPT-UserOpenAI · Live fetch when a user asks ChatGPT about a page. | AI assistant (live fetch) | disallowedDisallow: / | 200922 ms | 1,553 | blocked robots.txt Disallow: / (group: ChatGPT-User) |
| ClaudeBotAnthropic · Training crawler for Claude models. | AI training | disallowedDisallow: / | 406558 ms | 43 | blocked robots.txt Disallow: / (group: ClaudeBot) |
| Claude-SearchBotAnthropic · Indexes for Claude web search. | AI search index | allowed | 2001095 ms | 37 | visible HTTP 200, 37 words |
| Claude-UserAnthropic · Live fetch when a user asks Claude about a page. | AI assistant (live fetch) | allowed | 2003233 ms | 1,552 | partial Different content than humans receive |
| PerplexityBotPerplexity | AI search index | disallowedDisallow: / | 406554 ms | 43 | blocked robots.txt Disallow: / (group: PerplexityBot) |
| Perplexity-UserPerplexity | AI assistant (live fetch) | allowed | 406565 ms | 43 | blocked HTTP 406 for this user agent |
| BingbotMicrosoft · Bing index. Also feeds Copilot and ChatGPT search. | Search engine | allowed | 2001045 ms | 37 | visible HTTP 200, 37 words |
| Applebot-ExtendedApple · Robots-only token for Apple Intelligence training. | AI training | disallowedDisallow: / | n/a | blocked robots.txt Disallow: / (group: Applebot-Extended) | |
| Meta-ExternalAgentMeta | AI training | disallowedDisallow: / | 4061081 ms | 43 | blocked robots.txt Disallow: / (group: Meta-ExternalAgent) |
| AmazonbotAmazon · Alexa and Amazon AI. | AI training | disallowedDisallow: / | 406558 ms | 43 | blocked robots.txt Disallow: / (group: Amazonbot) |
| BytespiderByteDance · Known for ignoring robots.txt. | AI training | disallowedDisallow: / | 406588 ms | 43 | blocked robots.txt Disallow: / (group: Bytespider) |
| CCBotCommon Crawl · Open dataset used to train most LLMs. | AI training | disallowedDisallow: / | 406588 ms | 43 | blocked robots.txt Disallow: / (group: CCBot) |
Snapshot
Measured 2026-09-25 09:19 UTC from a residential connection. Sites change their rules often, and sites that verify crawler IPs answer differently to different networks. Run a live comparison to see what nature.com does right now, from Cloudflare's network.