Langflow vs Sim
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Langflow if you want open-source visual low-code builder for ai agents and rag apps (Supervised agent, freemium); choose Sim if you want open-source visual platform to build, deploy, and manage ai agent workflows (Supervised agent, freemium).
| Langflow | Sim | |
|---|---|---|
| What it is | Open-source visual low-code builder for AI agents and RAG apps | Open-source visual platform to build, deploy, and manage AI agent workflows |
| Type | platform | platform |
| Autonomy | Supervised agent | Supervised agent |
| Pricing | freemium · Self-host free (open source); managed/cloud options available | freemium · Free (Community); Pro $25/mo |
| Best for | developers, smb, enterprise | developers, smb, mid-market, enterprise |
| Deployment | self-hosted, saas | saas, self-hosted, api |
| Modalities | text, api | text, api, code |
| Models | model-agnostic, open-source | model-agnostic, open-source |
| Protocols | mcp, function-calling, rest-api | mcp, rest-api, function-calling |
| Integrations | OpenAI, Anthropic, Google Gemini, vector databases, DataStax Astra | Slack, Gmail, GitHub, Notion, Airtable, HubSpot |
| Capabilities | 3 documented | 4 documented |
Langflow
- +Open source with a large community and 100k+ GitHub stars
- +Built-in API and MCP servers make every flow a reusable tool
- +Backed by IBM (via DataStax) for continuity and enterprise reach
- -A building platform: you design the flows and their guardrails
- -Visual builders can get unwieldy for very complex logic
Sim
- +Genuinely open-source (Apache 2.0) with first-class self-hosting via Docker, npm, and local models (Ollama, vLLM)
- +Broad model and integration coverage plus multiple deployment modes (API, chat, schedule, webhook, MCP server)
- +Strong momentum: YC-backed with a Series A and tens of thousands of GitHub stars
- -Young company (founded 2025) with a small team and limited enterprise support track record
- -Paid cloud tiers are credit-metered, making costs harder to predict for heavy workloads
Which should you choose?
Langflow is open-source visual low-code builder for ai agents and rag apps, best for developers, smb, enterprise. Sim is open-source visual platform to build, deploy, and manage ai agent workflows, best for developers, smb, mid-market, enterprise. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.
This comparison is generated from the sourced Langflow and Sim profiles. Open either profile to review its evidence and last-reviewed date.