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llms.txt GeneratorHow big is the competitive set for AI citations?
The current index contains 725,777 unique cited domains across 1,928 tracked brands. That is the observed citation surface, although not every cited domain is a commercial competitor.
The key numbers.
- Unique domains
- Distinct normalized domains in the current brand snapshots.
- 725,777
- Tracked brands
- Current brand-snapshot coverage.
- 1,928
Domain breadth shows how wide the evidence layer is. It should not be confused with a count of direct competitors.
The evidence.
Source
AI Citation Index
| Measure | Result |
|---|---|
| Unique domains Distinct normalized domains in the current brand snapshots. | 725,777 |
| Tracked brands Current brand-snapshot coverage. | 1,928 |
Population and method
Built from 80,769,585 citation appearances across 725,777 unique domains in the latest valid snapshot for 1,928 tracked brands, observed from October 3, 2025 to October 14, 2026.
Where the evidence stops
The index is a changing panel of tracked brands and prompts, not a random sample of all AI responses.
Domain share is observational. It does not establish causal influence or reveal the full retrieval set.
The hand-maintained source taxonomy is partial: 88.40% of citation appearances remain in “other”.
Model attribution, response-level citation denominators, geography, raw prompts, and raw responses are not retained in the public aggregate.
What to do with this
- Audit the domains that already dominate your category and decide which ones are realistic citation targets.
- Build source-worthy pages for the query shapes where AI is already citing third parties.
- Treat reference, review, and social sources as part of your AI visibility surface, not as noise.
This answer matters because it turns a study finding into an operating rule teams can use when they decide what to publish, refresh, or measure next.
Questions about this answer.
Cite this answer.
Source study: Citation Sources“The current index contains 725,777 unique cited domains across 1,928 tracked brands. That is the observed citation surface, although not every cited domain is a commercial competitor.”
Mack Grenfell · How big is the competitive set for AI citations?
AI Citation Index · Trakkr Research · Updated 14 October 2026