User Sage is a user testing platform for fast, AI-assisted research with real and simulated participants. Run any study instantly with an AI panel of simulated participants shaped by a participant model you define: surveys, 5-second tests, first-click tests, prototype tests, tree tests, card sorts, and preference tests. Then validate what matters with real people through your own panel or our GenPop panel. User Sage also connects to your AI tools over MCP. In Muse and other MCP clients, an agent can plan a study from a plain goal, build it, start recruiting, and pull the findings, so a research run can start in a chat instead of a dashboard. AI output is a hypothesis, never the finding. Use an AI panel to look first, then confirm with participants before you ship. Go and see for yourself.