# Sim Studio: An Open-Source Visual Workflow Builder for Multi-Agent Systems

## Sim Studio: An Open-Source Visual Workflow Builder for Multi-Agent Systems

Emir and Waleed have introduced Sim Studio, a new open-source project aimed at simplifying the development and management of multi-agent workflows. Sim Studio offers a drag-and-drop graphical user interface (GUI) that allows users to visually design and orchestrate complex interactions between agents as a directed graph. This approach contrasts with the more common, code-centric methods currently prevalent in agent development frameworks.

The core idea behind Sim Studio is to provide an explicit and visual representation of the entire workflow, making it easier to understand, debug, and maintain agent-based applications. Users can define individual agent blocks with specific system prompts, choose from various models (including both hosted and local options via Ollama), and integrate tools with granular control over their usage.

According to the creators, existing frameworks often lead to complicated and difficult-to-debug multi-step agent systems. Sim Studio addresses this by allowing developers to visualize the entire architecture, including conditional logic (if/else), LLM-based routing, loops, and branching for specialized agents.

Beyond visual design, Sim Studio allows users to execute the defined workflows directly. This enables simulation and testing by running the workflow multiple times to assess the impact of changes to system prompts, underlying models, or tool calls on overall performance.

Sim Studio offers flexible deployment options. Workflows can be triggered manually, deployed as an API for HTTP interaction, or scheduled to run periodically. They can also be triggered by incoming webhooks and deployed as standalone chat instances with password or domain protection.

The platform includes built-in observability features like granular trace spans and logs, which facilitate comparing performance across different model providers and tools. This tight feedback loop allows for faster iteration and refinement of agent workflows.

Early users have already leveraged Sim Studio to build diverse applications, including deep research agents for detecting application fraud, chatbots for internal HR documentation, and agents automating communication between manufacturing facilities.

Sim Studio is licensed under Apache 2.0, making it fully open-source and freely available. The project’s repository can be found on GitHub ([https://github.com/simstudioai/sim](https://github.com/simstudioai/sim)), and documentation is available at [https://docs.simstudio.ai/introduction](https://docs.simstudio.ai/introduction). A demo is also accessible on YouTube ([https://youtu.be/JlCktXTY8sE?si=uBAf0x-EKxZmT9w4](https://youtu.be/JlCktXTY8sE?si=uBAf0x-EKxZmT9w4)).

With its visual, workflow-centric approach, Sim Studio aims to make building robust and complex agentic workflows more accessible and reliable, potentially lowering the barrier to entry for developers interested in exploring the capabilities of multi-agent systems.