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Haystack
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Haystack

Deepset’s Open-Source Modular Framework for Production RAG & Search

4.8
freeIntermediateTrendingVerifiedSince 2026-08
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About Haystack

Haystack is an open-source NLP and generative AI framework by Deepset, designed for building production-grade Retrieval-Augmented Generation (RAG), neural search, and multi-modal question-answering systems. Built with modular component architecture, Haystack allows engineering teams to assemble and customize search pipelines using diverse document stores, embedding models, and LLMs. With enterprise features like hybrid search (dense vector + sparse BM25 retrieval), advanced cross-encoder re-ranking, and structured pipeline validation, Haystack powers mission-critical search engines at global enterprises.

Haystack 2.0 provides a component-driven pipeline architecture where developers connect discrete nodes (DocumentStores, Embedders, Retrievers, Rankers, and Generators) into clean Directed Acyclic Graphs (DAGs). Pipelines can be serialized to YAML for continuous integration, tested locally, and deployed via REST API with Haystack service templates. Haystack integrates natively with all major vector databases, including Qdrant, Pinecone, Milvus, Weaviate, and OpenSearch, providing full vendor flexibility without vendor lock-in.

How It Works
1

Install Haystack with `pip install haystack-ai`.

2

Ingest enterprise documents using Haystack document converters and splitters.

3

Index chunks into your vector database of choice (Qdrant, Milvus, Pinecone, OpenSearch).

4

Assemble a RAG pipeline connecting Retrievers, Rankers, and LLM Generators.

5

Deploy the pipeline as a scalable REST API or Python microservice.

Platforms
PythonDockerCloudSelf-Hosted
Best For
Search EngineersData EngineersAI ArchitectsBackend Developers
Screenshot
Haystack screenshot

Capabilities & Features

Free Tier
API Access
No Signup Required
Open Source
Works Offline
Customizable
Multimodal
Image Input
File Upload
Web Search
Plugins
Collaboration
White Label
Self-Hostable
Voice InputImage OutputVideo InputVideo OutputAudio OutputCode ExecutionMemoryBrowser Extension

Common Use Cases

1

Enterprise knowledge search

2

Regulatory compliance RAG

3

Customer support semantic search

4

Scientific document Q&A

Frequently Asked Questions

What is the main advantage of Haystack over LangChain for RAG?

Haystack is built with a strictly typed component architecture and explicit pipeline graphs, making it significantly easier to debug, test, and optimize in high-throughput enterprise production.

Does Haystack support multimodal search?

Yes. Haystack includes native multimodal components for indexing, searching, and generating responses across text and images.

Pricing Modelfree

Free Plan

100% Free and open-source under Apache 2.0 License.

Paid Plan

Enterprise cloud deployments available via Deepset Cloud.

Get Started

Direct link · Verified & reader-supported

Pros & Cons

Production-grade modular component architecture with clean DAG pipelines

Native support for hybrid search (BM25 + Dense Vectors) and cross-encoder re-ranking

Vendor-agnostic: integrates with virtually all vector stores and model providers

Pipelines serialize to YAML for robust version control and CI/CD testing

Backed by Deepset with extensive documentation and enterprise support options

Requires Python backend development knowledge

Self-hosted vector infrastructure must be managed separately

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