Sim

What is Sim?

Sim is an open-source (Apache 2.0) workspace for building, deploying, and monitoring AI agent workflows through a visual canvas, a conversational "describe it and Sim builds it" builder, or direct code — connecting to 1,000+ app integrations and every major LLM provider.

Key features

• Visual drag-and-drop canvas for composing multi-step agent workflows
• Conversational builder: describe the workflow in natural language and Sim generates it
• Direct code editing for full control alongside the visual/chat builders
• 1,000+ integrations including Slack, HubSpot, Salesforce, Notion, GitHub, Gmail, Linear, Supabase, Stripe, and Jira
• Multi-LLM support: Anthropic Claude, OpenAI, Google, DeepSeek, xAI, Cerebras, Groq, Sakana AI
• Live execution tracing with block-by-block logs and real-time cost tracking
• Guardrail and evaluator blocks for output quality control
• Semantic data storage via tables, files, and knowledge bases

Who it's for

• Ops/RevOps teams automating lead enrichment and scoring
• Support teams building email triage and ticket-routing agents
• Cross-functional teams dispatching tasks between sales, engineering, and support
• Developers who want a self-hostable, open-source alternative to closed agent-workflow SaaS

When not to use it

If you need a single-purpose script rather than a multi-step orchestrated workflow, or you're not comfortable granting an agent workspace access to connected tools like Slack/Salesforce, a lighter-weight single-LLM integration will be simpler.

FAQ