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llms.txt Generatorllms.txt adoption is only 13.3%
Only 13.3% of scanned AI-cited domains had an llms.txt file in the Trakkr study.
Adoption is real, but still far from universal.
The numbers behind it.
- Adoption rate
- Domains with llms.txt in the study.
- 13.3%
- Domains scanned
- AI-cited domains scanned for llms.txt.
- 37,894
The evidence.
Source
The llms.txt Effect
| Measure | Result |
|---|---|
| Adoption rate Domains with llms.txt in the study. | 13.3% |
| Domains scanned AI-cited domains scanned for llms.txt. | 37,894 |
Population and method
Built from HTTP scans of 37,894 AI-cited domains, linked to 337,362 citations and 882 citation snapshots in the Trakkr corpus.
Where the evidence stops
This is an observational study. It measures correlation with citation outcomes, not a controlled experiment.
Adoption is uneven by sector, so raw averages can hide category concentration in SaaS and developer tooling.
The top-5,000 test returns p=0.85. The full scanned sample returns p<0.001 with reported r=-0.065. Neither establishes a causal effect. The public aggregates do not include confidence intervals or document the cohort for citation means and medians well enough to recompute the tests.
What to do with this
This is not yet a web-wide standard that citation winners consistently depend on.
Cite this fact.
Source study: llms.txt Effect“Only 13.3% of scanned AI-cited domains had an llms.txt file in the Trakkr study.”
The llms.txt Effect - Trakkr Research · llms.txt adoption is only 13.3%
The llms.txt Effect · Trakkr Research · Updated 4 September 2026