Each AI engine indexes, retrieves and cites differently. Citations.io tracks all four — and tells you what to fix per engine.
The largest answer engine by user base. Heavy on Reddit, Wikipedia and major publishers.
Read more →The most citation-transparent engine. Every answer shows the URLs it pulled from.
Read more →Gemini-powered AI answers in Google search. Blends with classic SERP behavior.
Read more →Conservative citation behavior, increasingly used in enterprise and analytic workflows.
Read more →Different retrieval, different source pools, different playbooks. Track all four or you're guessing.
| Trait | ChatGPT | Perplexity | Gemini / AIO | Claude |
|---|---|---|---|---|
| Brands per answer | 3–5 | 4–6 | 3–8 citations | 1–3 |
| Citation transparency | Partial | Full | Full (carousel) | Partial |
| Top source pool | Reddit, Wiki, publishers | Reviews, Reddit, Wiki | Google index + schema | Wiki, primary docs, analysts |
| Retrieval freshness | Live web | Live web | Live index | Mostly parametric |
| Best audience fit | Consumer + prosumer | Analysts + B2B buyers | Search-native users | Enterprise + regulated |
| Optimisation lag | Weeks | Days | Weeks | Months |