How AI decides who you should hire.

Every week, we ask OpenAI, Anthropic, Google Gemini, and Perplexity the same questions a real customer would type — "Who are the best roofing companies in Dallas, Texas?" — across 100 U.S. markets, using each provider's official API with active web search.
This is what they actually say, measured directly and published in full — not simulated, not sampled from reviews. We measure. We don't optimize.

Why not just ask ChatGPT yourself?

A single question gives you a single answer, once — not a measurement. We ask the same frozen set of questions to four AI models, every week, across every market we track. That repetition is the only way to tell a real shift in how AI recommends companies from one model's randomness on one day. No one else runs this at this scale, on a fixed weekly cadence, with every prompt and every response published in full.

100
Markets measured
76.3%
Avg. top-3 concentration
4
AI models per market
4
Question types per model
A few of the markets we track
theSierraIndex
Roofing contractors
Dallas, TX
77.9%
Top-3 companies’ share of responses.
theSierraIndex
Roofing contractors
Atlanta, GA
81.9%
Top-3 companies’ share of responses.
theSierraIndex
Roofing contractors
Boston, MA
72.5%
Top-3 companies’ share of responses.
Browse all 100 markets → Read the methodology Our commitments