simstudioai/Sim
Build, deploy, and orchestrate AI agents. Sim is the central intelligence layer for your AI workforce.
Sim is an open-source platform from Sim Studio for building and orchestrating AI agents on a visual canvas, connecting LLMs and over 1,000 integrations. You assemble agentic workflows by dragging and linking blocks, then deploy them as APIs or scheduled jobs to run your AI workforce.
Our Review
Sim reached 28,000 GitHub stars by making agent building feel like wiring a flowchart. Instead of scripting orchestration in code, you lay out an agent visually and Sim turns it into a deployable service, which is why both non-coders and engineers reach for it.
What Sim does:
- •Visual agent canvas drag and connect blocks for models, tools, logic, and memory to design an agent without writing orchestration code.
- •1,000+ integrations wire agents to apps and data sources, plus major LLMs like OpenAI, Anthropic, Gemini, and DeepSeek.
- •Deploy as APIs or jobs publish a workflow as an HTTP endpoint, a scheduled job, or a chat interface.
- •Agentic workflows branch, loop, and route between steps so agents handle multi-step tasks beyond a single prompt.
- •Self-hostable run the whole platform yourself with Docker, or use the hosted sim.ai cloud.
- •Built on Next.js a modern React codebase you can extend when you need custom blocks.
Getting started:
Try it on sim.ai, or self-host with Docker from the repo. Create a workflow on the canvas, connect your model and tools, and deploy. Docs are linked from sim.ai.
Limitations:
Sim is young (still pre-1.0 in 2026), so features and APIs move quickly and some rough edges remain. Self-hosting means running the Next.js app and its database yourself. The visual model is great for orchestration, but very custom logic can hit the limits of pre-built blocks, where you drop into code. Heavy production use of the hosted version moves into paid tiers.
Our Verdict
Sim is one of the most approachable open-source ways to build and ship AI agents in 2026. If you can picture your agent as a flowchart (this model, that tool, this decision), Sim lets you assemble and deploy it on a visual canvas, with 28,000 stars and a fast-moving team behind it.
For vibe builders, Sim removes the orchestration code: you connect blocks on a canvas, plug in 1,000+ integrations, and publish a working agent as an API or chat without managing servers, especially on the hosted sim.ai.
For developers, Sim is self-hostable, built on Next.js, and deployable as APIs and scheduled jobs, so it fits into existing infrastructure. You get visual speed for the common path and can extend with custom blocks or self-host for data control when you need it.
Skip Sim if your agent logic is highly bespoke and code-first; a framework like LangGraph gives finer control than a visual canvas. If you only need a single simple automation, a no-code tool like Zapier is lighter than running an agent platform.
Frequently Asked Questions
What is Sim?
Sim is an open-source platform from Sim Studio for building, deploying, and orchestrating AI agents on a visual canvas. You connect blocks for models, tools, logic, and over 1,000 integrations to assemble agentic workflows, then publish them as APIs, scheduled jobs, or chat interfaces. It targets both non-coders and developers who want to ship agents fast.
Is Sim free and open source?
Yes. Sim is released under the Apache-2.0 license and is free to self-host as of 2026. You can run the full platform yourself with Docker at no licensing cost. Sim Studio also offers a hosted version at sim.ai with free and paid tiers, so heavier production use can move to a managed plan.
Do I need to code to use Sim?
No coding is required for the core experience. Sim is built around a visual canvas where you drag and connect blocks to design an agent, which makes it usable by non-developers. Developers can go further by self-hosting the Next.js codebase and adding custom blocks, so the same tool scales from no-code to code.
How is Sim different from Zapier?
Zapier automates linear workflows between apps and is aimed at general business automation. Sim is built specifically for AI agents and agentic workflows, with branching, loops, model blocks, and memory on a visual canvas. Choose Zapier for simple app-to-app automations; choose Sim when you need an LLM-driven agent that reasons and routes across steps.
Can I self-host Sim?
Yes. Sim is designed to be self-hosted as of 2026, and the repository provides Docker-based setup. Because it is built on Next.js with a database backend, you run those components yourself and keep your workflows and data in your own environment. The hosted sim.ai option exists if you prefer not to manage infrastructure.
How do I install Sim?
Visit the GitHub repository at https://github.com/simstudioai/sim for installation instructions.
What license does Sim use?
Sim uses the Apache-2.0 license.
What are alternatives to Sim?
Explore related tools and alternatives on My AI Guide.
Open source & community-verified
Apache-2.0 licensed: free to use in any project, no strings attached. 28,696 developers have starred this, meaning the community has reviewed and trusted it.
Reviewed by My AI Guide for relevance, quality, and active maintenance before listing.
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