Top 20 open-source vector databases

Where AI apps keep their embeddings

更新 3 min ago · GitHub stars (stars)

なぜこの20か

Ranked by GitHub stars: how many developers bookmarked the project. Stars measure attention, not quality, so each row also shows forks, open issues, licence and the last push.

1

Mintplex-Labs/anything-llm

Stop renting your intelligence. Own it with AnythingLLM. Everything you need for a powerful local-first agent experience

67,344 stars 7,543 forks332 open issuesJavaScriptlast push 2026-10-20MIT
2

meilisearch/meilisearch

A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.

59,615 stars 2,751 forks320 open issuesRustlast push 2026-10-20NOASSERTION

こちらにも: #5 open-source databases
3

pathwaycom/serviette

A no-code RAG server that keeps answers in sync with your documents. Works with 8 vector databases. Built on Pathway.

58,786 stars 1,513 forks8 open issuesPythonlast push 2026-10-16MIT

こちらにも: #10 self-hosted apps
4

run-llama/llama_index

LlamaIndex is the document processing platform for AI

52,579 stars 8,387 forks997 open issuesPythonlast push 2026-10-20MIT
5

milvus-io/milvus

Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search

46,443 stars 4,308 forks1,426 open issuesGolast push 2026-10-20Apache-2.0
6

volcengine/OpenViking

Self-evolving Context Database for AI Agents. Unify Agent Memory, Knowledge RAG and Skills.

40,412 stars 3,247 forks996 open issuesPythonlast push 2026-10-20AGPL-3.0
7

VectifyAI/PageIndex

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

39,332 stars 3,420 forks145 open issuesPythonlast push 2026-10-20MIT
8

qdrant/qdrant

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

35,153 stars 2,765 forks777 open issuesRustlast push 2026-10-20Apache-2.0
9

topoteretes/cognee

Cognee is the open-source AI memory platform for agents. Give your AI agents persistent long-term memory with small models for free

32,574 stars 3,419 forks918 open issuesPythonlast push 2026-10-20Apache-2.0
10

NirDiamant/RAG_Techniques

This repository showcases various advanced techniques for Retrieval-Augmented Generation (RAG) systems. Each technique has a detailed notebook tutorial.

29,918 stars 3,835 forks8 open issuesJupyter Notebooklast push 2026-10-17NOASSERTION
11

weaviate/weaviate

Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering...

16,893 stars 1,423 forks792 open issuesGolast push 2026-10-20NOASSERTION
12

memvid/memvid

Memory layer for AI Agents. Replace complex RAG pipelines with a serverless, single-file memory layer. Give your agents instant retrieval and long-term memory.

16,605 stars 1,568 forks34 open issuesRustlast push 2026-07-14Apache-2.0
13

alibaba/zvec

A lightweight, lightning-fast, in-process vector database

16,126 stars 1,014 forks85 open issuesC++last push 2026-10-20Apache-2.0
14

langchain4j/langchain4j

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers...

13,267 stars 2,763 forks1,009 open issuesJavalast push 2026-10-20Apache-2.0
15

StarTrail-org/LEANN

[MLsys2026 Best Paper]: https://arxiv.org/abs/2506.08276. RAG on Everything with LEANN. Enjoy 97% storage savings while running a fast, accurate, and 100%...

13,038 stars 1,346 forks46 open issuesPythonlast push 2026-10-17MIT
16

neuml/txtai

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

13,027 stars 1,169 forks37 open issuesPythonlast push 2026-10-19Apache-2.0
17

zilliztech/claude-context

Code search MCP for Claude Code. Make entire codebase the context for any coding agent.

12,628 stars 942 forks147 open issuesTypeScriptlast push 2026-07-14MIT
18

lancedb/lancedb

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

11,711 stars 1,124 forks751 open issuesRustlast push 2026-10-20Apache-2.0
19

oramasearch/orama

🌌 A complete search engine and RAG pipeline in your browser, server or edge network with support for full-text, vector, and hybrid search in less than 2kb.

10,581 stars 407 forks35 open issuesTypeScriptlast push 2026-10-18NOASSERTION
20

oceanbase/oceanbase

OceanBase is the unified distributed database for the AI era — open-source, multi-model, one engine for your most demanding workloads.

10,344 stars 1,929 forks609 open issuesC++last push 2026-10-10Apache-2.0