LangChain builds an open-source framework (and LangGraph/LangSmith platform) for developing, orchestrating, and monitoring LLM-powered applications and AI agents.
Langflow is an open-source, low-code visual builder for LLM agents and RAG apps, owned by DataStax, which IBM acquired in 2025.
The Verdict: LangChain vs Langflow
Pick LangChain if your team writes Python or TypeScript and wants control in production: it is a code-first framework (LangChain plus LangGraph) with LangSmith for tracing and evaluation. Pick Langflow if you want to build agents and RAG flows on a visual, low-code canvas. Both are MIT-licensed open source. The bigger difference is ownership: LangChain is an independent startup, while Langflow belongs to DataStax, which IBM acquired in 2025.
Popularity is close. As of November 7, 2026, Langflow had 156.4k GitHub stars and LangChain had 149.2k. LangChain also says langchain and langgraph have a combined 90 million monthly downloads, and that 35 percent of the Fortune 500 use its services. LangChain raised a $125 million Series B at a $1.25 billion valuation in October 2025.
Where they overlap
Both are built for the same job: LLM agents and retrieval-augmented apps that call models, tools, and vector databases. Langflow's README says it "supports all major LLMs, vector databases and a growing library of AI tools." LangChain covers the same integrations in code. For a first prototype, either one works.
How you build with each
LangChain is a library. You write the agent graph in code with LangGraph, version it, test it, and trace it in LangSmith. The 1.0 releases of LangChain and LangGraph shipped on October 22, 2025, and LangChain describes the rewritten langchain package as "opinionated, focused, and powered by langgraph's runtime."
Langflow is a canvas. You connect components visually, then run or deploy the flow. IBM describes it as "a low-code, open-source app builder for RAG and multi-agent AI applications" that is "Python-based and model-, API-, and database-agnostic." It suits small teams and people who don't want to write orchestration code.
Production tooling and business model
LangChain makes money on LangSmith. In its Series B announcement the company said monthly LangSmith trace volume had grown 12x year over year. On November 3, 2026 it announced LangSmith bring-your-own-cloud on AWS, Azure, and Google Cloud. Customers it names include Replit, Clay, Harvey, Rippling, Cloudflare, Workday, and Cisco.
Langflow's commercial path runs through IBM. DataStax bought Logspace, the startup behind Langflow, in April 2024, according to TechCrunch. IBM announced its plan to acquire DataStax on February 25, 2025, saying Langflow "adds additional flexible middleware capabilities to IBM watsonx.ai," and IBM watsonx later posted "It's official: We have acquired DataStax!" The datastax.com site now redirects to IBM's DataStax product page.
Funding and ownership
LangChain's Series B was led by IVP, with existing investors Sequoia, Benchmark, and Amplify, and new investors CapitalG and Sapphire Ventures. ServiceNow Ventures, Workday Ventures, Cisco Investments, Datadog Ventures, Databricks Ventures, and Frontline also joined. Its Series A was $25 million, led by Sequoia, in February 2024. LangChain has not published a total for all its funding.
Langflow has no separate cap table or valuation. DataStax did not disclose what it paid for Logspace, and Langflow's roadmap is now set inside IBM. That gives it an enterprise sales channel, but less independence than a venture-backed vendor.
Which one to choose
Choose LangChain if you have engineers, need fine-grained control and observability, or are building agents that will run at scale. Choose Langflow if non-engineers or a small team need to build and change flows visually, or if you already buy from IBM.
Frequently asked questions
Is LangChain the same company as Langflow?
No. LangChain is an independent startup that raised a $125 million Series B at a $1.25 billion valuation in October 2025. Langflow was built by Logspace, which DataStax acquired in April 2024. IBM announced its acquisition of DataStax in February 2025 and has since completed it.
Is Langflow built on LangChain?
Not as it is described today. The current Langflow README presents it as a standalone builder that supports "all major LLMs, vector databases and a growing library of AI tools," and does not mention LangChain. Treat them as separate tools.
Which is more popular, LangChain or Langflow?
On GitHub, Langflow is slightly ahead, with 156.4k stars to LangChain's 149.2k as of November 7, 2026. On usage, LangChain reports 90 million combined monthly downloads for langchain and langgraph and says 35 percent of the Fortune 500 use its services.
Which is easier to learn, LangChain or Langflow?
Langflow, for most people. Its drag-and-drop canvas lets you assemble a RAG or agent flow without writing orchestration code. LangChain requires Python or TypeScript, but it gives more control over how agents run in production, and LangSmith adds tracing and evaluation.
Who owns Langflow?
DataStax, which is now part of IBM. DataStax acquired Logspace, the company behind Langflow, in April 2024. IBM announced it would buy DataStax on February 25, 2025, and IBM watsonx later announced the deal was done.
Sources
- LangChain blog: Series B, $125M at $1.25B (Oct 20, 2025)
- LangChain blog: LangChain and LangGraph reach v1.0 (Oct 22, 2025)
- LangChain blog: Series A led by Sequoia (Feb 15, 2024)
- LangChain blog index: LangSmith BYOC on AWS, Azure, Google Cloud (Nov 3, 2026)
- GitHub: langchain-ai/langchain
- GitHub: langflow-ai/langflow
- GitHub: langchain-ai/langchainjs (TypeScript)
- TechCrunch: DataStax acquires the startup behind Langflow (Apr 4, 2024)
- IBM Newsroom: IBM to acquire DataStax (Feb 25, 2025)
- IBM watsonx on LinkedIn: "We have acquired DataStax"
- IBM: DataStax product page
Data from Value Add Pulse coverage and company research — see the full threads for LangChain and Langflow.