# GoogleOther vs Perplexity-User

GoogleOther and Perplexity-User compared on 12 documented fields, from 18 claims, last verified 2026-09-15.

| Field | GoogleOther | Perplexity-User | Comparison |
| --- | --- | --- | --- |
| cites_sources | not documented | yes | different |
| honours_crawl_delay | no | not_documented | different |
| observed_fetches_robots_txt | no | not documented | different |
| observed_requested_mcp_endpoint | yes | not documented | different |
| publishes_ip_list | yes | yes | same |
| purpose_documented | mixed | user_fetch | different |
| reads_llms_txt | not documented | not_documented | different |
| respects_robots_txt | yes | no | different |
| robots_txt_token | GoogleOther | not documented | different |
| separate_search_and_training_tokens | not_documented | not_documented | same |
| user_agent_string_full | not documented | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user) | different |
| verifiable_by_rdns | yes | not_documented | different |

## Differences

| Field | GoogleOther statement | Perplexity-User statement |
| --- | --- | --- |
| cites_sources | not documented | Perplexity includes a link to each page that Perplexity-User visits in the Perplexity response. |
| honours_crawl_delay | Google does not support the robots.txt Crawl-delay directive for GoogleOther. | Perplexity does not publish whether Perplexity-User honours the robots.txt Crawl-delay directive. |
| observed_fetches_robots_txt | GoogleOther made 93 requests to Rattlesnakes By Mail between 2026-09-13T20:00Z and 2026-09-15T09:00Z and fetched /robots.txt on none of those requests. GoogleOther's first request to Rattlesnakes By Mail was the home page at 2026-09-14T12:03:30Z. | not documented |
| observed_requested_mcp_endpoint | GoogleOther requested the /mcp endpoint of Rattlesnakes By Mail twice between 2026-09-13T20:00Z and 2026-09-15T09:00Z, at 2026-09-14T15:07:30Z and at 2026-09-14T18:27:49Z. Rattlesnakes By Mail returned status 405 to both GoogleOther requests for /mcp. | not documented |
| purpose_documented | GoogleOther is a generic crawler that Google product teams use to fetch publicly accessible content from sites. | Perplexity-User visits web pages to answer questions that users ask Perplexity. |
| reads_llms_txt | not documented | Perplexity does not publish whether Perplexity-User reads llms.txt files. |
| respects_robots_txt | GoogleOther obeys robots.txt rules when crawling automatically. | Perplexity-User ignores robots.txt rules because a user requests each Perplexity-User fetch. |
| robots_txt_token | The robots.txt token for GoogleOther is GoogleOther. | not documented |
| user_agent_string_full | not documented | Perplexity-User sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user). |
| verifiable_by_rdns | GoogleOther requests are verifiable by reverse DNS lookup resolving to googlebot.com, google.com, or googleusercontent.com. | Perplexity does not publish a reverse-DNS verification method for Perplexity-User. |

## Sources

- https://developers.google.com/crawling/docs/crawlers-fetchers/verifying-googlebot
- https://developers.google.com/search/blog/2019/07/a-note-on-unsupported-rules-in-robotstxt
- https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers
- https://developers.google.com/static/crawling/ipranges/common-crawlers.json
- https://docs.perplexity.ai/docs/resources/perplexity-crawlers
- https://rattlesnakesbymail.com/observed/googleother
- https://www.perplexity.ai/perplexity-user.json