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Langflow vs Sim: catalog facts
Langflow	Sim
Free Free and open source under the MIT license.	Freemium Open source to self-host; the hosted workspace is available with sales-led plans for…
Web, Self-hosted	Web, Self-hosted, Command line
Visual canvas plus built-in API and MCP server output Supports a large library of LLMs, vector databases and tools	Visual workflow canvas plus conversational and code building Hundreds of integrations and support for major LLMs
Requires separate access to whichever LLM providers or local models you connect Complex workflows can require developer-level setup	Organisation-focused features add complexity for solo use Advanced governance features point toward sales-led plans
Self-hosted, Web application	Web application, Self-hosted
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.