Haystack vs LangChain(2026)
Haystack is better for teams that need production-grade reliability. LangChain is the stronger choice if largest ecosystem. Haystack is open-source (from $0) and LangChain is open-source (from $0).
Full feature breakdown, pricing details, and pros & cons below.
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Haystack
Haystack by deepset is an open-source LLM framework for building production-ready search and question-answering pipelines with modular components and enterprise reliability.
Starting at $0
Visit HaystackLangChain
LangChain is the most widely used framework for building LLM applications with chains, agents, memory, and retrieval-augmented generation (RAG) — available in Python and JavaScript.
Starting at $0
Visit LangChainHow Do Haystack and LangChain Compare on Features?
| Feature | Haystack | LangChain |
|---|---|---|
| Pricing model | open-source | open-source |
| Starting price | $0 | $0 |
| Modular pipeline architecture | ✓ | — |
| Document stores | ✓ | — |
| Retrieval pipelines | ✓ | — |
| Prompt builder | ✓ | — |
| Evaluation tools | ✓ | — |
| REST API deployment | ✓ | — |
| Enterprise support | ✓ | — |
| Chains and agents | — | ✓ |
| RAG support | — | ✓ |
| Memory management | — | ✓ |
| Tool calling | — | ✓ |
| LangSmith (observability) | — | ✓ |
| Vector store integrations | — | ✓ |
| Python + JS | — | ✓ |
Haystack Pros and Cons vs LangChain
Haystack
LangChain
Should You Use Haystack or LangChain?
Choose Haystack if…
- •Production-grade reliability
- •Modular architecture
- •Strong evaluation tools
Choose LangChain if…
- •Largest ecosystem
- •Best documentation
- •Rapid prototyping