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Best tools·Vector Databases·RAG

Best Vector Databases for RAG

7 Vector Databases tools ranked by GitHub activity, community traction, and use‑case match — as of 2026-06-01.

Ranked by signal score (GitHub stars × 0.5 + PH votes × 0.3 + use-case tag match × 0.2). Data as of 2026-06-01. How we rank →

7 tools

  1. 01

    milvus-io

    milvus

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

    44,564Open-source
    Vector DatabasesWebsite →
  2. 02

    memgraph

    memgraph

    High-performance open-source in-memory graph database for GraphRAG, AI memory, agentic AI, and real-time graph analytics. Cypher-compatible, built in C++.

    4,089
    Vector DatabasesWebsite →
  3. 03

    zilliztech

    memsearch

    A persistent, unified memory layer for all your AI agents (e.g. Claude Code, Codex), backed by Markdown and Milvus.

    1,783Open-source
    Vector DatabasesWebsite →
  4. 04

    Qdrant

    mcp-server-qdrant

    An official Qdrant Model Context Protocol (MCP) server implementation

    1,404Open-source
    Vector DatabasesWebsite →
  5. 05

    kiwifs

    kiwifs

    Knowledge filesystem agents can write to, search, query, and trust.

    770
    Vector DatabasesWebsite →
  6. 06

    oceanbase

    powermem

    PowerMem: Your AI-Powered Long-Term Memory — Accurate, Agile, Affordable. Also friendly support for the OpenClaw Memory Plugin.

    687
    Vector DatabasesWebsite →
  7. 07

    Pinecone

    Pinecone

    Production-grade managed vector database with serverless and pod-based tiers.

    Vector DatabasesWebsite →

How we chose

Signal score weights: GitHub stars (50%), ProductHunt votes (30%), use-case tag match (20%). Minimum 4 qualifying tools per page. Only tools in published state with ≥80% data completeness included.

Full methodology →

Related

Questions

What is the best Vector Databases tool for RAG?
Based on signal score, milvus leads this list with 44,564 GitHub stars. It is categorized under Vector Databases.
How do these Vector Databases tools compare on price?
milvus: Open-source. memsearch: Open-source. mcp-server-qdrant: Open-source.
Which of these tools works best with RAG?
Tools with the highest use-case tag match for RAG in this list: milvus, memgraph, memsearch. Use-case match is one of three signals in our ranking; see the methodology link above for how it's weighted.
Are there open-source options in this list?
milvus (Apache-2.0), memsearch (MIT), mcp-server-qdrant (Apache-2.0).
How often is this list updated?
GitHub stats refresh weekly. ProductHunt votes refresh weekly. Pricing data refreshes daily. This page last verified 2026-06-01.