TheySaid is an AI-powered customer research and usability testing platform designed to help product teams validate ideas, evaluate designs, and understand user experiences. The software provides AI-moderated usability tests, conversational surveys, customer interviews, feedback forms, and polls within a unified research workspace. Its synthetic testing capabilities use AI-generated participants trained on more than 100,000 hours of real usability sessions and customized with customer information such as surveys, support tickets, and CRM records. Organizations can also conduct studies with existing customers, recruited participants, or third-party research panels to collect feedback from real users. AI moderators guide participants through tasks, ask contextual follow-up questions, and capture screen recordings, voice responses, and interaction data. Automated analysis identifies recurring usability issues, customer frustrations, behavioral patterns, and opportunities to improve product experiences. TheySaid provides integrations with Claude, Cursor, Replit, Lovable, Jira, Linear, ClickUp, and other development tools to support testing directly within product workflows. Its Model Context Protocol integration enables AI coding assistants to initiate tests, retrieve findings, and generate recommended changes without switching applications. Additional features include multilingual testing in more than 70 languages, participant screening, automated reporting, video highlights, customizable audiences, and continuous product experience monitoring.