| Website | haystack.deepset.ai |
| Category | AI / NLP / RAG |
| License | Apache 2.0 (open source) |
| Pricing | Free (open source), deepset Cloud available |
Overview
Haystack by deepset is an open-source framework for building LLM applications. Composable pipelines, RAG, agents. Production-ready NLP infrastructure.
Pros
- Apache 2.0 license
- Composable pipeline architecture
- Production-ready RAG
- Agent framework
- Document stores integration
- Strong community
Cons
- Steeper learning curve than LangChain
- deepset Cloud pricing
- Pipeline debugging complex
- Documentation can lag releases
- Heavy dependency tree
Verdict
Haystack is the production-grade alternative to LangChain. Where LangChain excels at prototyping, Haystack is built for production: composable pipelines that are testable, debuggable, and deployable. The RAG pipeline is particularly strong, with built-in document preprocessing, retrieval, and generation. For teams building NLP applications that need to work at scale, Haystack provides the engineering foundation.