# Haystack

> Haystack is a Python library for building vector search and embedding-based retrieval pipelines, integrating ANN indexes without requiring full databases. Key features include support for HNSW, FAISS indexes, quantization options, and multi-language embeddings. Perfect for prototyping RAG systems and embedded AI apps; more flexible than hnswlib, lighter than Milvus for development workflows.

- **URL:** https://haystack.deepset.ai/
- **Category:** Libraries
- **Tags:** Open Source, Semantic Search, Rag, Ann Library, Embeddable
- **Updated:** 2026-04-24 10:19
- **Canonical page:** https://vectordb.ever.works/items/haystack

## Details

## Overview

Haystack is an open-source framework for building AI applications focused on semantic search and LLM workflows.

## Features

- Semantic search capabilities
- LLM orchestration
- Language model workflow management

## Pricing

Free and open-source.

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