Choose Haystack if you want
Retrieval pipelines with explicit control.
Explicit, inspectable pipelines for retrieval and agent workflows under Apache 2.0. Pipeline design takes time to learn, and its agent focus is narrower than LangChain's.
Choose LangChain if you want
Large agent projects that need many integrations.
The largest ecosystem here, with LangGraph for agent workflows and LangSmith for tracing on paid tiers. Its breadth can be heavy for small projects, which is where the smaller frameworks fit better.
Side by side
 Haystack |  LangChain | |
|---|---|---|
| Score | 85.0 | 92.0 |
| Rank in list | #4 of 8 | #1 of 8 |
| Price | Free and open sourceFree Apache-2.0 framework; the repository lists no fee | Free and open sourceMIT-licensed framework is free; LangSmith hosted service has Developer, Plus and Enterprise plans |
| Free to use | Yes | Yes |
| Open source | Yes | Yes |
| Platforms | WebWeb | WebWeb |
| Made by | deepset | LangChain |
| Language | Python | Python and TypeScript |
| Agent approach | Explicit pipelines | Graph workflows with LangGraph |
| Paid hosted service | Not listed | LangSmith paid plans |
| Best for | Retrieval pipelines with explicit control | Large agent projects that need many integrations |
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| Links | Visit site | Visit site |
Questions about Haystack vs LangChain
- Is LangChain better than Haystack?
- LangChain ranks higher in our list of AI agent frameworks and tooling (#1 against #4, score 92.0 against 85.0). Haystack is best for: retrieval pipelines with explicit control. LangChain is best for: large agent projects that need many integrations.
- Which is cheaper, Haystack or LangChain?
- Haystack: Free Apache-2.0 framework; the repository lists no fee. LangChain: MIT-licensed framework is free; LangSmith hosted service has Developer, Plus and Enterprise plans.
- Do Haystack and LangChain run on the same platforms?
- Haystack supports Web. LangChain supports Web.