# llms.txt adoption by citation tier | Trakkr Research

Canonical URL: https://trakkr.ai/trakkr-research/llmstxt-effect/trackers/llmstxt-adoption-by-tier-tracker
Published: 2026-03-14
Last updated: 2026-03-14
Author: Mack Grenfell

Research tracker page for The llms.txt Effect study, focusing on llms.txt adoption by citation tier.

## Methodology

Built from HTTP scans of 37,894 AI-cited domains, linked to 337,362 citations and 882 citation snapshots in the Trakkr corpus.

## Summary

Adoption of llms.txt peaks at 16.1 percent among the top 5000 cited domains, compared to a baseline of 13.3 percent across the full corpus. However, the top 50 cited domains exhibit a lower adoption rate of 6.0 percent, indicating that the most highly cited head domains do not currently drive llms.txt implementation.

## Benchmark rows

| Metric | Value | Context |
| --- | --- | --- |
| Adoption rate | 13.3% | Domains with llms.txt in the study. |
| Top 5k adoption | 16.1% | Adoption among the top 5,000 cited domains. |
| Top 50 adoption | 6.0% | Adoption among the top 50 cited domains. |

## Ranked view

| Item | Value | Detail |
| --- | --- | --- |
| Top 5,000 cited domains | 16.1% | The highest adoption tier highlighted in the study. |
| Full corpus | 13.3% | Baseline adoption across all scanned domains. |
| Top 50 cited domains | 6.0% | The very head of the citation graph is not highly reliant on llms.txt. |

## Related pages

Continue through the same study cluster.

- [does llms txt increase ai citations](https://trakkr.ai/trakkr-research/llmstxt-effect/answers/does-llms-txt-increase-ai-citations) - Related answer page
- [how common is llms txt on ai cited domains](https://trakkr.ai/trakkr-research/llmstxt-effect/answers/how-common-is-llms-txt-on-ai-cited-domains) - Related answer page
- [llms txt adoption is only thirteen point three percent](https://trakkr.ai/trakkr-research/llmstxt-effect/facts/llms-txt-adoption-is-only-thirteen-point-three-percent) - Related fact page

## Data And Sources

- [The llms.txt Effect](https://trakkr.ai/trakkr-research/llmstxt-effect) - Flagship study behind this page
- [Page JSON](https://trakkr.ai/data/research-answers/llmstxt-effect/trackers/llmstxt-adoption-by-tier-tracker.json) - Machine-readable companion file