Sim AI

Sim AI: An Open-Source Visual Builder for AI Agent Workflows

Sim AI is an open-source platform for building, deploying, and managing AI agents. You can wire up workflows on a visual canvas — connecting blocks, models, and integrations — or simply describe what you need in plain English and let Sim construct a working agent for you. Either way, the output is a deployable workflow that automates tasks across the tools your team already uses.

The block system covers real agentic logic, not just linear automation: Agent, Router, Function, Condition, API, Workflow, Parallel, Guardrails, Evaluator, and Loop blocks compose into multi-step systems. Semantic data storage — tables, files, and knowledge bases — gives agents grounded context, while live traces, logs, and per-run cost visibility keep production behavior observable.

Key Features

• Visual drag-and-drop builder plus a conversational interface that generates workflows from natural language
• 1,000+ integrations including Slack, HubSpot, Salesforce, Notion, Jira, and Linear
• Ten block types spanning routing, conditions, loops, parallelism, guardrails, and evaluators
• Multi-LLM support: OpenAI, Anthropic Claude, Google, DeepSeek, xAI, Groq, Cerebras, and more
• Built-in monitoring with live traces, logs, and real cost visibility per workflow run
• Free forever tier (1,000 monthly credits); Pro at $25/user/month, Max at $100/user/month, plus self-hosting on Enterprise

Ideal Use Case

Sim AI fits teams that want n8n- or Zapier-style automation but with agents at the center: ops teams automating triage and enrichment, developers prototyping multi-agent systems without boilerplate, and enterprises that need SOC2 compliance or self-hosted deployment. The free tier is enough to build and run real workflows before paying.

How Sim AI differentiates

Sim is fully open source, with its repository at github.com/simstudioai/sim sitting at roughly 29,100 GitHub stars. The company reports more than 100,000 builders on the platform, is SOC2 compliant, and names customers including Rivian, Russell Investments, and eXp Realty — unusual production traction for an open-source agent builder.

FAQ

Is Sim AI really free? Yes. The free tier is free forever with 1,000 monthly credits, 5 GB storage, and 30-day log retention. Pro ($25/user/month) and Max ($100/user/month) raise credits, storage, and rate limits.

Can I self-host it? Yes. The platform is open source on GitHub, and self-hosting with SSO and dedicated support is part of the Enterprise offering.

Which LLMs does it support? Every major provider, including OpenAI, Anthropic, Google, DeepSeek, xAI, Groq, and Cerebras — you can mix models within one workflow.

How is it different from Zapier or n8n? Sim is agent-first: blocks like Router, Evaluator, Guardrails, and Loop let LLMs make decisions inside the workflow, and semantic knowledge bases give agents context, rather than only chaining API triggers.

tl;dr

Sim AI is an open-source, agent-first alternative to Zapier and n8n: build AI agent workflows visually or in plain English, connect 1,000+ tools, run any major LLM, and self-host if you want. ~29k GitHub stars, 100,000+ builders, free to start.

Related

Looking for more options? Browse the AI Agents directory or read our best AI agents listicle. Sim AI is also tracked on Crunchbase.