What is Sim?
Stop wrestling with boilerplate code and start building. Sim is an open-source, visual workflow builder designed for developers who want to create and deploy powerful AI agents with speed and clarity. Using an intuitive, drag-and-drop canvas, you can connect Large Language Models (LLMs) with your favorite tools to design, test, and launch production-ready agentic workflows in a fraction of the time.
Key Features
Sim provides a robust, user-friendly environment to move your AI projects from concept to completion.
🎨 Intuitive Drag-and-Drop Canvas Visually construct complex AI logic by connecting modular blocks on an infinite canvas. This Figma-like interface allows you to see the entire flow of your agent, making it easier to design, debug, and iterate than with code-heavy frameworks. You build at the speed of your ideas.
🔌 Connect Any Tool or AI Model Seamlessly integrate with your existing stack. Sim comes with 60+ pre-built integrations for tools like Slack, Notion, and Google Sheets, and supports major LLMs from OpenAI, Anthropic, and Google. Critically, it also supports local models via Ollama, so you can develop privately and deploy flexibly without vendor lock-in.
🤝 Real-Time Team Collaboration Work on workflows with your team simultaneously in a shared visual space. Just like in Google Docs, you can see your teammates' cursors and changes as they happen, enabling faster collaboration, pair programming, and knowledge sharing for AI development.
🚀 Production-Ready Deployment Sim is built for more than just prototyping. Deploy your workflows as robust REST APIs, integrate them into existing systems with an SDK, or embed them as plugins. With built-in monitoring, versioning, logging, and error handling, you have the tools you need to run your agents reliably in production.
Use Cases
Build Advanced AI Assistants: Create sophisticated chatbots and personal assistants that can do more than just talk. Equip them with tools to search the web (using Exa or Perplexity), access your knowledge bases in Notion or Airtable, and take action by sending emails or Slack messages.
Automate Content & Data Pipelines: Automate the creation of blog posts, social media updates, or marketing copy. Build workflows that pull data from Google Sheets, process it with a custom function, generate structured content with an LLM, and post it directly to your platform.
Create Intelligent API Orchestrators: Use Sim to combine multiple services into a single, intelligent endpoint. For example, build a workflow that takes a user request, uses an AI Router block to determine intent, calls the appropriate internal or external APIs, and returns a unified, structured JSON response.
Unique Advantages: Why Choose Sim?
Sim is engineered to provide a fundamentally better developer experience for building with AI.
Visual Building vs. Abstract Code: While traditional frameworks require you to manage complex codebases and dependencies, Sim’s visual canvas makes agent logic tangible and easy to understand. You spend less time debugging abstract code and more time creating value.
True Flexibility with Open Source: Unlike many proprietary, black-box platforms, Sim is fully open-source. This gives you complete transparency, the freedom to self-host, and the ability to extend the platform with your own custom tool integrations.
Collaboration-Native Design: While most AI tools are built for solo developers, Sim is the only workflow builder in its class designed from the ground up for real-time, Google Docs-style collaboration, drastically accelerating team projects.
Unmatched Model & Tool Freedom: Instead of locking you into a single ecosystem, Sim provides comprehensive multi-provider support for both cloud and local LLMs. This allows you to test with cheap local models and deploy with powerful production models without ever rebuilding your workflow.
Conclusion:
Sim empowers you to move from an idea to a production-ready AI agent faster and more effectively than ever before. By replacing abstract code with an intuitive visual interface and fostering seamless collaboration, it frees you to focus on genuine innovation.
Explore how Sim can streamline your AI development and start building your first workflow today!
More information on Sim
Launched
Pricing Model
Free
Starting Price
Global Rank
Follow
Month Visit
<5k
Tech used
Sim was manually vetted by our editorial team and was first featured on 2025-08-07.
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Build MCP-ready tools for your AI agents - just by prompting! Get a visual logic flow of the tool instead of a large code blob. Tweak, test, and perfect your tool’s logic, on an infinite low-code canvas. Host the tool instantly or export the code to self-host.
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