Research
Studies built from the weekly measurements, and checked figures from others. Each has a table, CSV and JSON downloads, its method, and its sample sizes or sources.
Which websites each engine cited for local-service questions, with sample sizes.
Whether the businesses Google shows for Phoenix home-services searches are the ones the AI engines name, and the reverse, per trade and engine, with sample sizes.
When ChatGPT, Claude, Perplexity, and Gemini name a business for the same question, how often they name the same one, per trade, with the questions compared and the questions left out.