sim
The premium Open Source alternative to Stack AI
🎯 Best for:Developers building complex agentic workflows.
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%