Vector Database Python Packages

qdrant-client

Python client for Qdrant vector search engine

llama-index

LlamaIndex is the leading document agent and OCR platform

llama-index-core

LlamaIndex is the leading document agent and OCR platform

lancedb

Developer-friendly OSS embedded retrieval library for multimodal AI. Search More; Manage Less.

pymilvus

Python SDK for Milvus Vector Database

llama-index-instrumentation

LlamaIndex is the leading document agent and OCR platform

honcho-ai

Memory library for building stateful agents

redisvl

Redis Vector Library (RedisVL) -- the AI-native Python client for Redis.

llama-index-legacy

LlamaIndex is the leading document agent and OCR platform

langchain-milvus

The LangChain wrapper of Milvus vector database for efficient vector search, full-text search, hybrid retrieval and RAG.

flashrank

Lite & Super-fast re-ranking for your search & retrieval pipelines. Supports SoTA Listwise and Pairwise reranking based on LLMs and cross-encoders and more. Created by Prithivi Da, open for PRs & Collaborations.

nano-vectordb

A simple, easy-to-hack Vector Database

deeplake

Deeplake is AI Data Runtime for Agents. It provides serverless postgres with a multimodal datalake, enabling scalable retrieval and training.

cognee

Memory control plane for AI Agents in 6 lines of code

vicinity

Lightweight Nearest Neighbors with Flexible Backends

fast-plaid

High-Performance Engine for Multi-Vector Search

pyobvector

A Python SDK for OceanBase Multimodal Store—enabling vector search, full-text search, and JSON table operations—offers both Milvus-compatible API and SQLAlchemy-based SQL mode, and supports both OceanBase and OceanBase seekdb.

logosdb

LogosDB is a fast semantic vector database for RAG written in C/C++ that provides approximate nearest-neighbor search over embedding vectors with associated text metadata.

yantrikdb

Cognitive memory engine for AI agents — temporal decay, contradiction detection, autonomous consolidation, knowledge graph, ANN recall via HNSW. Embeddable Rust library with Python bindings; powers yantrikdb-server (HTTP gateway, MCP server, openraft cluster). AGPL.

pageindex

📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG

txtai

💡 All-in-one AI framework for semantic search, LLM orchestration and language model workflows

lilbee

Terminal-first local search and AI chat over your documents, code, and crawled websites. Semantic + hybrid search, vision OCR, auto-built wiki, browsable GGUF model catalog. Works as CLI, TUI, MCP server, REST API, or Python library. Offline by default, no sidecar services.

tqdb

Embedded vector database using the TurboQuant algorithm (arXiv:2504.19874) — zero training, 2-4 bit compression, fast inner-product search

weaviate-cli

CLI tool for Weaviate