Milvus vs Weaviate
Both are free/open-source alternatives to Pinecone. Here's how they stack up — verified facts, no spin.
Milvus
The heavy-scale distributed choice — billions of vectors, Apache-2.0.
Milvus is a cloud-native, distributed vector database under the LF AI & Data Foundation, licensed Apache-2.0 and developed by Zilliz. It is engineered for the top end of scale — billions of vectors, horizontal scaling, tiered storage — with a managed option (Zilliz Cloud) when you want the same engine without the Kubernetes homework. If your vector workload is genuinely huge, this is the open-source engine built for it.
Weaviate
Open-source with built-in hybrid search and a module ecosystem.
Weaviate is an open-source (BSD-3-Clause), cloud-native vector database that stores objects and vectors together, pairing similarity search with structured filtering and strong built-in hybrid (keyword + vector) search. Its module system can handle embedding generation for you, and Weaviate Cloud offers the managed path. A polished middle ground between Qdrant's lean engine and Milvus's heavy distribution.
Side by side
| Milvus | Weaviate | |
|---|---|---|
| Sovereignty Score | 88 | 87 |
| Open source | Yes | Yes |
| Self-hostable | Yes | Yes |
| Local-first | No | No |
| License | Apache-2.0 | BSD-3-Clause |
| Pricing | Free self-hosted (Apache-2.0); Zilliz Cloud managed tiers incl. a free tier | Free self-hosted (BSD-3-Clause); Weaviate Cloud managed tiers |
Milvus edges it on the Sovereignty Score, but the right pick depends on the trade-offs below.
Milvus
Strengths
- +Proven at billion-vector scale, horizontally scalable
- +LF AI & Data governance — not a single-vendor project
- +Managed escape hatch (Zilliz Cloud) with the same engine
Trade-offs
- −Distributed architecture = real operational complexity self-hosted
- −Overkill for small and mid-size workloads
Weaviate
Strengths
- +Hybrid keyword + vector search built in
- +Modules can generate embeddings server-side
- +GraphQL and REST APIs; solid multi-tenancy
Trade-offs
- −Heavier than Qdrant for simple use cases
- −Module system adds a learning curve
Facts verified 2026-07-15. Licenses and pricing change — spotted something out of date? That's a correction we want.