Milvus vs 
Vespa
Milvus vs Vespa compared for 2026 — features, license, ease of use, performance and which one to choose. Billion-scale vector database vs Big-scale hybrid search and ranking platform.
Updated regularly · curated by OpenSourceAI.tech
Milvus vs Vespa at a glance
| Spec | Milvus | Vespa |
|---|---|---|
| Category | Vector database | Vector database |
| Type | Vector database | Search & serving engine |
| License | Apache-2.0 | Apache-2.0 |
| Runs locally | Self-hosted | Yes |
| Primary language | Go / C++ | Java/C++ |
| Ease of use | Advanced | Advanced |
| Best for | teams needing billion-scale vector search | web-scale hybrid search with online ranking |
| GitHub stars | 45.2k | 7k |
Feature comparison
| Feature | Milvus | Vespa |
|---|---|---|
| Self-hostable | ✓ | ✓ |
| Managed cloud | ✓ | ✓ |
| Metadata filtering | ✓ | ✓ |
| Hybrid search | ✓ | ✓ |
| Horizontal scaling | ✓ | ✓ |
| REST API | ✓ | ✓ |
How Milvus and Vespa score
| Criterion | Milvus | Vespa |
|---|---|---|
| Popularity | 4.0 | 2.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 2.5 | 2.5 |
| Privacy | 4.5 | 5.0 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Milvus
Milvus is a cloud-native vector database built for massive scale, with multiple index types and a distributed architecture for billions of vectors.
- Scales to billions of vectors
- Many index types for tuning
- Cloud-native, distributed architecture
Vespa
Vespa is a production engine combining vector search, lexical search and ML-model ranking over billions of documents with real-time writes — the platform behind major web-scale services.
- True hybrid: vectors + text + ML ranking in one query
- Real-time indexing at very large scale
- Proven in production for decades at Yahoo/Verizon Media
Key differences
Milvus is vector database, while Vespa is search & serving engine. They also differ in how they run (Self-hosted vs Yes). In short, Milvus fits teams needing billion-scale vector search, and Vespa fits web-scale hybrid search with online ranking.
Which should you choose?
Choose Milvus for teams needing billion-scale vector search. Choose Vespa for web-scale hybrid search with online ranking.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Milvus or Vespa easier to use?
Both sit at a similar level (Advanced). Your choice should come down to fit rather than difficulty.
Are Milvus and Vespa free?
Milvus is free and open source (Apache-2.0), and Vespa is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Milvus and Vespa locally?
Milvus: self-hosted · Vespa: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Milvus vs Vespa — which should I pick in 2026?
Choose Milvus for teams needing billion-scale vector search. Choose Vespa for web-scale hybrid search with online ranking.
People also compare
Explore more open-source AI
Browse thousands of open-source AI tools, models and projects — all curated in one place, updated daily.
Explore the directory →