PostHog llms.txt: what the file contains
Measured on 5 October 2026: 420.5 KB, 68 sections, 4220 links. How that compares with the other 124 files we track, and what it implies.
Last updated:
The file
PostHog publishes an llms.txt at https://posthog.com/llms.txt.
The file declares itself as PostHog in its H1, and the host is categorised here as SaaS. It was last fetched and parsed on 5 October 2026.
Measured structure
| Measure | PostHog | Corpus median | Percentile |
|---|---|---|---|
| Size | 420.5 KB | 14.0 KB | 98% |
| H2 sections | 68 | 7 | 99% |
| Links | 4,220 | 70 | 100% |
| Blockquote summary | Present | 107 of 125 have one | n/a |
Percentiles are against the 125 files in this directory, not against the web. That population is deliberately weighted toward documentation platforms and developer tools, which is where the convention started, so treat it as a peer group rather than a norm.
Observations
- 4220 links is closer to a sitemap than to a curated index. The convention exists so a model can skip crawling everything; a list this long hands the selection problem straight back to it.
- 68 sections is unusually granular against a corpus median of 7.
- At 420.5 KB, this is among the larger files in the directory. Check its token cost against the client’s context limit and whether detailed material would be better served through links.
Comparable files
Closest in size within SaaS, from the same weekly check:
- n8n Docs: 280.3 KB, 10 sections, 1363 links, no blockquote summary
- Zendesk: 724.0 KB, 19 sections, 3133 links
- WorkOS: 96.0 KB, 32 sections, 836 links
- Slack: 39.7 KB, 7 sections, 165 links
How this was measured
The historical check followed redirects, rejected HTML responses and required an initial H1. It counted H2 headings and Markdown list links with regular expressions, rather than running the full validator. Counts and bytes describe the retained response text, subject to the extraction limit. This snapshot was generated on 2026-10-05.
Want to check a file yourself, including this one? Paste the URL into the validator. To see how to find any site's file, see how to find a website's llms.txt, and for the full list see the directory of 125 verified files.