How common is llms.txt on AI-cited domains? | Trakkr Research
It is still uncommon. Only 13.3% of the 37,894 scanned AI-cited domains had an llms.txt file.
Methodology: Built from HTTP scans of 37,894 AI-cited domains, linked to 337,362 citations and 882 citation snapshots in the Trakkr corpus.
Direct Answer
Rarely. Only 13.3% of the 37,894 scanned AI-cited domains had an llms.txt file.
What this means
Operators must allocate technical SEO resources efficiently. Knowing the low adoption rate prevents teams from over-investing in this file at the expense of core content quality and structure.
Evidence table
| Metric | Value | Why it matters |
|---|---|---|
| Domains scanned | 37,894 | AI-cited domains scanned for llms.txt. |
| Adoption rate | 13.3% | Domains with llms.txt in the study. |
| Domains with llms.txt | 5,035 | Absolute adoption count. |
Frequently Asked Questions
How many AI-cited domains actually use llms.txt?
Out of 37,894 scanned domains, exactly 5,035 domains feature the file.
Is an llms.txt file required to get cited by AI engines?
No. With an adoption rate of 13.3%, the vast majority of cited domains do not use the file.
What to do next
- Treat llms.txt as an optional housekeeping file rather than a primary citation-growth lever.
- Prioritize answer quality, source coverage, and page structure before spending disproportionate effort on llms.txt.
- Measure discovery and crawl behavior directly if you publish llms.txt instead of assuming it improves citation performance.
Related pages
Continue through the same study cluster.
- is llms txt more common on top domains than the long tail - Related answer page
- which industries adopt llms txt most - Related answer page
- median citations are identical with and without llms txt - Related fact page
- llmstxt adoption by sector tracker - Related tracker page
Data & Sources
- The llms.txt Effect - Flagship study behind this page
- Page JSON - Machine-readable companion file