sim

The premium Open Source alternative to Stack AI

🎯 Best for:Developers building complex agentic workflows.
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Apache-2.0License

What is sim?

Replaces proprietary agent builders like Stack AI or Flowise. Provides a visual canvas to design, test, and deploy autonomous LLM agents with custom tool integrations.

Tech Stack
TypeScriptAI, ML & Data

Why sim?

  • Visual workflow builder
  • Custom tool integration
  • No vendor lock-in

Limitations

  • Early stage maturity
  • Requires LLM API management
  • Documentation gaps
3/6/2026
Last Update
3,389
Forks
178
Issues
Apache-2.0
License
Financial Leak Detected

Stop the "SaaS Tax"

Your team could be burning cash. Switching to sim instantly boosts your runway.

Competitor Cost
-$1,440
/ year (est. based on Stack AI)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%

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