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 🔍

pgml

Postgres with GPUs for ML/AI apps.

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 🔍

libpecos

PECOS - Prediction for Enormous and Correlated Spaces

tiledb-vector-search

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

annoy-mm

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

ngt

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

lotf

[CVPR25] LotusFilter: Fast Diverse Nearest Neighbor Search

annlite

⚡ A fast embedded library for approximate nearest neighbor search

pymuvera

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

nilvec

A lightweight library for nearest neighbor search in Rust.

nanopq

Pure python implementation of product quantization for nearest neighbor search

hannoy

HNSW Approximate Nearest Neighbors in Rust, based on LMDB and optimized for memory usage

instant-distance

Fast minimal implementation of HNSW maps for approximate nearest neighbors searches

superkmeans

⚡ Super fast clustering for high-dimensional vectors on CPUs (x86, ARM) and GPUs — for Python and C++. 100x faster clustering of vector embeddings than FAISS

mlots

mlots is python package that provides Machine Learning tools for Time-Series Classification.

lynsedb

A pure Python-implemented, lightweight, server-optional, multi-end compatible, vector database deployable locally or remotely.

citrusdb

(distributed) vector database

zeusdb

High-performance database management system

vink

Vector Incremental Nano Kit — a lightweight vector database with incremental inserts, automatic exact-to-ANN switching, and explicit storage management. Add vectors anytime without rebuilding the index

pgml-extension

Simple machine learning in PostgreSQL.