The AI Citation Index
Who does AI trust as a source — not who it names, but where it points when it explains itself. Every domain ChatGPT, Gemini and Perplexity actually cited across our 1147 tracked buyer questions, ranked by how often each engine reached for it. This is different from the AI Visibility Index: a firm can be named without a domain being cited, and a domain (a directory, a review site, a publication) can be cited across dozens of firms' answers without being any single firm's own page.
| # | Domain | ChatGPT | Gemini | Perplexity |
|---|---|---|---|---|
| 1 | reddit.com | 3 | 71 | 441 |
| 2 | linkedin.com | 0 | 0 | 211 |
| 3 | forbes.com | 50 | 16 | 140 |
| 4 | zurichdental.ch | 0 | 65 | 64 |
| 5 | nerdwallet.com | 20 | 0 | 89 |
| 6 | styleyoursmile.ch | 4 | 54 | 46 |
| 7 | gartner.com | 36 | 4 | 61 |
| 8 | ubs.com | 34 | 7 | 53 |
| 9 | swiss-smile.com | 3 | 37 | 53 |
| 10 | 209nycdental.com | 3 | 36 | 49 |
| 11 | dental11.ch | 4 | 25 | 46 |
| 12 | cnbc.com | 0 | 0 | 73 |
| 13 | learn.g2.com | 6 | 0 | 65 |
| 14 | zahncity.ch | 0 | 22 | 46 |
| 15 | zahnarzt-zuerich-loewenplatz.ch | 0 | 39 | 28 |
| 16 | gitnux.org | 0 | 0 | 65 |
| 17 | g2.com | 24 | 0 | 40 |
| 18 | whatclinic.com | 0 | 2 | 62 |
| 19 | onedoc.ch | 1 | 12 | 50 |
| 20 | wsj.com | 0 | 0 | 62 |
| 21 | finestsmile.ch | 0 | 10 | 50 |
| 22 | moneysupermarket.com | 6 | 15 | 39 |
| 23 | creativeplanning.com | 0 | 3 | 55 |
| 24 | zocdoc.com | 12 | 9 | 36 |
| 25 | learn.microsoft.com | 54 | 0 | 3 |
Sorted by total questions citing that domain, summed across the engines it was cited on — engines are never blended into one score, each column is its own real count. A domain is counted once per question it was cited on, per engine, regardless of how many times it appeared within that answer.
Built from the same committed study data as every tracked buyer question — a working preview, not yet a standing, re-measured index.