What is Haystack?
Haystack is an open-source AI orchestration framework from deepset for building LLM-powered agents and applications. You assemble a system from modular building blocks (retrievers, generators, prompt templates, tools, and more) into pipelines that can branch, loop, and serialize, so each step from retrieval to reasoning to memory and tool use stays visible and inspectable.
In practice you can build RAG pipelines with hybrid retrieval and self-correction loops, design agents with standardized tool calling, create conversational bots through a unified generator interface, and run multimodal workflows that include image processing and audio transcription. It connects to providers such as OpenAI, Anthropic, Mistral, Hugging Face, Weaviate, Pinecone and Elasticsearch, and pipelines can be deployed on Kubernetes with logging and monitoring. Haystack Enterprise adds paid support and a visual platform for pipeline design.
Key features
- Modular pipelines with branching and looping
- Standardized tool calling for agents
- Hybrid retrieval and RAG pipelines
- Integrations with OpenAI, Anthropic, Mistral, Hugging Face and vector databases
- Jinja-2 prompt templates
- Serializable, Kubernetes-ready deployment with logging and monitoring
Who is it for
- AI engineers and developers
- Teams building production RAG applications
- Enterprises needing support and deployment guidance
Pros and cons
- Open source with no vendor lock-in
- Full visibility to inspect and debug each step
- Enterprise Platform and support are paid and priced by company size
Haystack pricing
The vendor does not publish prices in a readable form (often pricing is shown only after signing in).
Is Haystack free?
Yes, there is a free plan. The open-source framework is free to use (pip install haystack-ai). Enterprise support and the Enterprise Platform are paid, with a trial for the platform.
Haystack alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 LangChain | 39 USD/mo | yes | Website & app builders |
 Gemini Enterprise Agent Platform | 0,75 USD | ? | Website & app builders |
 Mastra | 250 USD/mo | yes | Website & app builders |
 Pipedream | 99 USD/mo | yes | Website & app builders |
 Langflow | not listed | yes | Website & app builders |
 Dify | 590 USD/yr | yes | Website & app builders |
All alternatives to Haystack →
FAQ
What is Haystack used for?
Open-source framework for building production-ready, LLM-powered agents and RAG applications from modular, composable components.
Is Haystack free?
Yes, there is a free plan. The open-source framework is free to use (pip install haystack-ai). Enterprise support and the Enterprise Platform are paid, with a trial for the platform.
How much does Haystack cost?
The vendor does not publish prices publicly or requires sign-in.
What are the best Haystack alternatives?
Closest alternatives: LangChain, Gemini Enterprise Agent Platform, Mastra, Pipedream, Langflow.
Data checked October 12, 2026 on the vendor website (haystack.deepset.ai).