Sim: Open-Source Agentic Workflow Builder
Published:Dec 11, 2025 17:20
•1 min read
•Hacker News
Analysis
Sim is presented as an open-source alternative to n8n, focusing on building agentic workflows with a visual editor. The project emphasizes granular control, easy observability, and local execution without restrictions. The article highlights key features like a drag-and-drop canvas, a wide range of integrations (138 blocks), tool calling, agent memory, trace spans, native RAG, workflow versioning, and human-in-the-loop support. The motivation stems from the challenges faced with code-first frameworks and existing workflow platforms, aiming for a more streamlined and debuggable solution.
Key Takeaways
- •Sim is an open-source visual editor for building agentic workflows.
- •It offers a wide range of integrations and features like tool calling, agent memory, and native RAG.
- •The project aims to provide granular control and easy observability for agent development.
- •It can be run locally using Docker without restrictions.
Reference
“The article quotes the creator's experience with debugging agents in production and the desire for granular control and easy observability.”