Weaviate vs 
Vespa
Weaviate vs Vespa compared for 2026 — features, license, ease of use, performance and which one to choose. Vector DB with built-in modules vs Big-scale hybrid search and ranking platform.
Updated regularly · curated by OpenSourceAI.tech
Weaviate vs Vespa at a glance
| Spec | Weaviate | Vespa |
|---|---|---|
| Category | Vector database | Vector database |
| Type | Vector database | Search & serving engine |
| License | BSD-3-Clause | Apache-2.0 |
| Runs locally | Self-hosted | Yes |
| Primary language | Go | Java/C++ |
| Ease of use | Intermediate | Advanced |
| Best for | teams wanting hybrid search and built-in modules | web-scale hybrid search with online ranking |
| GitHub stars | 16.6k | 7k |
Feature comparison
| Feature | Weaviate | Vespa |
|---|---|---|
| Self-hostable | ✓ | ✓ |
| Managed cloud | ✓ | ✓ |
| Metadata filtering | ✓ | ✓ |
| Hybrid search | ✓ | ✓ |
| Horizontal scaling | ✓ | ✓ |
| REST API | ✓ | ✓ |
How Weaviate and Vespa score
| Criterion | Weaviate | Vespa |
|---|---|---|
| Popularity | 3.5 | 2.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 3.5 | 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
Weaviate
Weaviate is an open-source vector database with built-in vectorization modules, hybrid search and a GraphQL API for AI-native applications.
- Built-in vectorization and reranker modules
- Hybrid (vector + keyword) search
- GraphQL and REST APIs
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
Weaviate is vector database, while Vespa is search & serving engine. Their licenses differ (BSD-3-Clause vs Apache-2.0), which matters if you ship a commercial product. Weaviate leans more intermediate-friendly, whereas Vespa is more suited to advanced users. They also differ in how they run (Self-hosted vs Yes). In short, Weaviate fits teams wanting hybrid search and built-in modules, and Vespa fits web-scale hybrid search with online ranking.
Which should you choose?
Choose Weaviate for teams wanting hybrid search and built-in modules. 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 Weaviate or Vespa easier to use?
Weaviate is generally the easier of the two to get started with, while Vespa rewards more setup with more control.
Are Weaviate and Vespa free?
Weaviate is free and open source (BSD-3-Clause), and Vespa is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Weaviate and Vespa locally?
Weaviate: self-hosted · Vespa: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Weaviate vs Vespa — which should I pick in 2026?
Choose Weaviate for teams wanting hybrid search and built-in modules. Choose Vespa for web-scale hybrid search with online ranking.
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