Show HN: Sim Studio – Open-Source Agent Workflow GUI

Summary

Sim Studio is a powerful, user-friendly platform for building, testing, and optimizing agentic workflows. Run Run on our cloud-hosted version Self-host How to Self-Host There are several ways to self-host Sim Studio: Option 1: Docker Environment (Recommended) # Clone your forked repository git clone https://github.com/YOUR_USERNAME/sim.git cd sim # Create environment file and update with required environment variables (BETTER_AUTH_SECRET) cp sim/.env.example sim/.env # Start Sim Studio using the provided script docker compose up -d --build or ./start_simstudio_docker.sh After running these commands: Access the Application: Open http://localhost:3000/w/ in your browser The /w/ path is where the main workspace interface is located Useful Docker Commands: # View application logs docker compose logs -f simstudio # Access PostgreSQL database docker compose exec db psql -U postgres -d simstudio # Stop the environment docker compose down # Rebuild and restart (after code changes) docker compose up -d --build Working with Local Models To use local models with Sim Studio, follow these steps: Pull Local Models # Run the ollama_docker.sh script to pull the required models ./sim/scripts/ollama_docker.sh pull < model_name > Start Sim Studio with Local Models # Start Sim Studio with local model support ./start_simstudio_docker.sh --local # or # Start Sim Studio with local model support if you have nvidia GPU docker compose up --profile local-gpu -d --build # or # Start Sim Studio with local model support if you don't have nvidia GPU docker compose up --profile local-cpu -d --build The application will now be configured to use your local models. You can access it at http://localhost:3000/w/. Option 2: Dev Containers Open VS Code or your favorite VS Code fork (Cursor, Windsurf, etc.) Install the Remote - Containers extension Open the project in your editor Click "Reopen in Container" when prompted The environment will automatically be set up in the sim directory Run npm run dev in ...