Milvus vs Weaviate
A side-by-side comparison of two self-hosted search engines options — licensing, setup difficulty, resource needs, and what each one replaces.
Weaviate
Open-source vector database for semantic and AI search
| Feature | Milvus | Weaviate |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 100 · Excellent | 95 · Excellent |
| Category | Search Engines | Search Engines |
| License | Apache-2.0 | BSD-3-Clause |
| Language | Go | Go |
| Setup difficulty | Hard | Medium |
| Min. RAM | 4,096 MB | 2,048 MB |
| Deployment | docker, kubernetes, helm | docker, kubernetes, helm |
| GitHub stars | ★ 46,245 | ★ 16,841 |
| First released | 2019 | 2019 |
| Replaces | Pinecone, Elasticsearch | Pinecone, Algolia |
What are Milvus and Weaviate?
Milvus
Milvus is an open-source vector database designed for scalable similarity search and AI applications. It can manage billions of vectors and supports semantic search and recommendation use cases.
- Billion-scale vector search
- Multiple index types
- Cloud-native distributed architecture
- Hybrid search support
Weaviate
Weaviate is an open-source vector database that stores objects and their vector embeddings for semantic search. It enables AI-powered similarity search, retrieval-augmented generation and hybrid queries.
- Vector and hybrid search
- Built-in vectorization modules
- GraphQL and REST APIs
- Horizontal scaling
Milvus vs Weaviate: key differences
Both projects are written in Go. Licensing differs — Apache-2.0 for Milvus versus BSD-3-Clause for Weaviate. Weaviate is the lighter option, starting around 2,048 MB of RAM against 4,096 MB for Milvus. Milvus has the considerably larger community, at 46,245 GitHub stars versus 16,841.
Why pick each one
Choose Milvus if…
- Scales to massive datasets
- Mature vector ecosystem
Watch out for
- Complex distributed deployment
Choose Weaviate if…
- Great for AI semantic search
- Easy to start
Watch out for
- Memory hungry with large datasets
Frequently asked questions
Is Milvus or Weaviate better?
Neither is universally better. Milvus has the larger community, while Weaviate is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Milvus and Weaviate free and open-source?
Yes. Milvus is licensed under Apache-2.0 and Weaviate under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Milvus and Weaviate with Docker?
Milvus: yes. Weaviate: yes.
Which is lighter on resources, Milvus or Weaviate?
Weaviate has the smaller minimum footprint at 2,048 MB of RAM, compared to about 4,096 MB for Milvus. Real-world usage depends on library size, user count, and enabled features.