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Reviewed · Updated 2026-06-16

Milvus

Platform for generating, deploying, and managing autonomous AI applications.

Reviewed by the Conversion Gems editorial team ·
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Pricing
Paid
Best for
Data Engineers
Category
AI Development
The bottom line

A powerful, open-source vector database for large-scale similarity search; free to self-host, with managed Zilliz Cloud if you'd rather not run it.

7.9
Our score
7.9 / 10
Conversion Gems editorial verdict
Free (open-source); Zilliz Cloud from free tier
Features9/10
9 - billion-scale, multiple index types, hybrid search, GPU support and distributed architecture.
Value9/10
9 - free open-source with a generous managed free tier.
Ease of use5/10
5 - easy to start, but hard to self-host at scale.
Ecosystem9/10
9 - huge adoption, LangChain/LlamaIndex integrations and Zilliz Cloud.
Support6/10
6 - community OSS support; paid support via Zilliz.

Community ratings

4.7/ 5 aggregate · across 1 source
G2
4.710+ reviews

Third-party ratings shown verbatim; aggregate weighted by review volume.

What it really is

An open-source vector database built for similarity search over embeddings at scale - powering RAG, semantic search and recommendation - not a platform for 'autonomous AI apps'.

Our take

It is one of the most widely adopted open-source vector databases, engineered for billion-scale vectors with multiple index types, hybrid search and high performance, and used by 10,000+ organizations. The trade-offs: self-hosting Milvus at scale is operationally heavy, so many teams pay for the managed Zilliz Cloud (free tier, then usage-based) to avoid the ops.

Best for
Engineering teams building RAG, semantic search or recommendations
Apps needing billion-scale, low-latency vector search
Teams wanting open-source control with an optional managed path
Not good for
Small projects that just need a lightweight embedded vector store
Teams without the ops capacity to self-host at scale
Non-developers wanting a no-code tool
Friction report
Time to value
Quick to try (Milvus Lite/Docker), but production self-hosting (sharding, scaling, ops) is involved; Zilliz Cloud's free tier removes that.
Scale breakpoint
Self-hosting at scale is operationally heavy (clustering, tuning, storage), pushing many teams to the managed, usage-priced Zilliz Cloud.
Walled garden
Low lock-in for the OSS core; the managed cloud is a separate, optional paid service.

Frequently Asked Questions

Alternatives

Step up

Zilliz Cloud (managed Milvus) or Pinecone - fully managed, vector-first databases.

Lighter alternative

pgvector or Chroma - simpler vector storage for smaller-scale needs.

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Tags

#VectorDatabase#RAG#SemanticSearch

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