Sonder – self-hosted AI social simulation engine

Sonder is a free, self-hosted AI simulation engine that creates realistic social interactions by generating AI agents with distinct personalities, backgrounds, and emotional states who autonomously converse based on user scenarios. Users can observe these simulations, whisper to individual agents, or watch human-like dynamics unfold, with agents displaying authentic behavioral patterns. The platform supports multiple free AI providers including Cerebras and Groq for fast responses, runs locally without cloud dependencies, and stores simulations as editable files for complete user control.