{
  "kind": "fact",
  "studySlug": "llmstxt-effect",
  "slug": "llms-txt-adoption-is-only-thirteen-point-three-percent",
  "title": "llms.txt adoption is only 13.3%",
  "description": "Trakkr scanned 37894 AI-cited domains to measure the adoption rate of the llms.txt file standard.",
  "lastUpdated": "2026-03-14",
  "lastTested": "2026-03-14",
  "sourceStudyUrl": "/trakkr-research/llmstxt-effect",
  "sourceStudyTitle": "The llms.txt Effect",
  "claimIds": [
    "llmstxt-effect:adoption",
    "llmstxt-effect:domains"
  ],
  "relatedSlugs": [
    "answer:does-llms-txt-increase-ai-citations",
    "answer:how-common-is-llms-txt-on-ai-cited-domains",
    "tracker:llmstxt-adoption-by-tier-tracker"
  ],
  "methodologySummary": "Built from HTTP scans of 37,894 AI-cited domains, linked to 337,362 citations and 882 citation snapshots in the Trakkr corpus.",
  "limitations": [
    "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.",
    "A null citation effect does not mean llms.txt has zero operational value for every workflow. It means the study did not find a measurable citation lift."
  ],
  "keywords": [
    "llms.txt",
    "llms txt effect",
    "AI citations",
    "does llms.txt work"
  ],
  "schemaHints": {
    "pageType": "Article",
    "includeDataset": true
  },
  "claim": "Only 13.3 percent of the 37894 AI-cited domains scanned in the Trakkr study had an implemented llms.txt file.",
  "supportingMetrics": [
    {
      "label": "Adoption rate",
      "value": "13.3%",
      "detail": "Domains with llms.txt in the study."
    },
    {
      "label": "Domains scanned",
      "value": "37,894",
      "detail": "AI-cited domains scanned for llms.txt."
    }
  ],
  "whyItMatters": "Strategists and operators should note that llms.txt is not yet a prerequisite for AI visibility. Resource allocation should prioritize established content structuring methods over immediate llms.txt implementation until adoption rates indicate a shift in engine parsing requirements.",
  "citationBlock": {
    "quote": "Only 13.3% of scanned AI-cited domains had an llms.txt file in the Trakkr study.",
    "attribution": "The llms.txt Effect - Trakkr Research",
    "url": "https://trakkr.ai/trakkr-research/llmstxt-effect/facts/llms-txt-adoption-is-only-thirteen-point-three-percent"
  }
}