MarketFish – Simulate a market with 128 AI consumers before you launch

MarketFish is a market simulation tool that uses 128 AI consumers with distinct identities, budgets, and biases to test product viability across 30 shopping rounds before launch, revealing purchase decisions and competitive outcomes. Built on six academic papers and supporting 11 LLM providers, it offers three modes—Explore, Validate, and Hybrid—to help founders discover product directions, test pricing, and benchmark against AI competitors. The open-source tool runs locally via Streamlit and requires only one LLM API key to begin simulating realistic market behavior.