Haystack
Open-source orchestration framework for building production LLM apps, RAG and agents.
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About Haystack
Haystack is listed in our frameworks category and is aimed at builders. Open-source orchestration framework for building production LLM apps, RAG and agents. Pricing, as the maker states it: Open source + cloud. Maturity: Mature. We last checked the official link on 2026-10-16.
What is Haystack?
Haystack, from deepset, is an open-source AI orchestration framework for building production-ready LLM applications in Python.
You design modular pipelines and agent workflows with explicit control over retrieval, routing, memory and generation, to build RAG systems, multimodal apps, semantic search, question answering and autonomous agents. A cloud offering is available alongside the open-source framework.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: haystack.deepset.ai.
Who is Haystack for?
Python teams building production RAG, search or agent applications who want transparent, modular pipelines.
Haystack at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: deepset-ai/haystack · 26,801 stars (as of Oct 21, 2026)
Key features
- Modular pipelines and agent workflows
- Control over retrieval, routing, memory and generation
- RAG, semantic search and QA
- Open source plus cloud
Haystack FAQ
What is Haystack?
Haystack, from deepset, is an open-source AI orchestration framework for building production-ready LLM applications in Python.
Who is Haystack for?
Python teams building production RAG, search or agent applications who want transparent, modular pipelines.
Is Haystack free?
Haystack's pricing, as the maker states it: Open source + cloud. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is Haystack open source?
Yes. Haystack is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to Haystack?
Similar tools include PocketFlow, Strands Agents, Upsonic, Lyzr, RAGEN and Lagent.
Haystack ratings and reviews
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Haystack alternatives
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RAGEN
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Lagent
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