Approximate Nearest Neighbor Search Python Packages

lancedb

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

pynndescent

A Python nearest neighbor descent for approximate nearest neighbors

annoy

Approximate Nearest Neighbors in C++/Python optimized for memory usage and loading/saving to disk

usearch

Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍

lynsedb

Embedded-first vector database that grows into a self-hosted service and lightweight cluster.

tiledb-vector-search

Cloud-native vector similarity search and storage with efficient, serverless scale-out

libpecos

PECOS - Prediction for Enormous and Correlated Spaces

annoy-mm

Approximate Nearest Neighbors in C++/Python optimized for memory usage and loading/saving to disk

usearch-iscc

Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍

pgml

Postgres with GPUs for ML/AI apps.

annlite

⚡ A fast embedded library for approximate nearest neighbor search

lotf

LotusFilter: Diversity-aware approximate nearest neighbor search

ngt

Nearest Neighbor Search with Neighborhood Graph and Tree for High-dimensional Data

nilvec

A lightweight library for nearest neighbor search in Rust.

nanopq

Pure python implementation of product quantization for nearest neighbor search

hannoy

Production-ready KV-backed HNSW implementation in Rust using LMDB

superkmeans

A Super fast K-Means library for High-Dimensional vectors on CPUs (x86, ARM) and GPUs

instant-distance

Fast approximate nearest neighbor searching in Rust, based on HNSW index

mrpt

Fast and lightweight header-only C++ library (with Python bindings) for approximate nearest neighbor search

sklearn-ann

Integration with (approximate) nearest neighbors libraries for scikit-learn + clustering based on with kNN-graphs.

wiki-passage-retriever

A simple tool to retrieve relevant Wikipedia passages

pymuvera

Python library for MUVERA multi-vector retrieval via Fixed Dimensional Encodings. ColBERT / ColQwen2 / ColQwen3.5 compatible.

citrusdb

open-source vector database. store and retrieve embeddings for your next ai project!

semantic-ai

An open source framework for Retrieval-Augmented System (RAG) uses semantic search helps to retrieve the expected results and generate human readable conversational response with the help of LLM (Large Language Model).