Milvus vs 
pgvectorscale
Milvus vs pgvectorscale compared for 2026 — features, license, ease of use, performance and which one to choose. Billion-scale vector database vs Make pgvector fast at scale.
Updated regularly · curated by OpenSourceAI.tech
Milvus vs pgvectorscale at a glance
| Spec | Milvus | pgvectorscale |
|---|---|---|
| Category | Vector database | Vector database |
| Type | Vector database | PostgreSQL extension |
| License | Apache-2.0 | PostgreSQL |
| Runs locally | Self-hosted | Yes |
| Primary language | Go / C++ | Rust |
| Ease of use | Advanced | Intermediate |
| Best for | teams needing billion-scale vector search | scaling pgvector past a few million rows |
| GitHub stars | 45.2k | — |
How Milvus and pgvectorscale score
| Criterion | Milvus | pgvectorscale |
|---|---|---|
| Popularity | 4.0 | n/a |
| Maintenance | 5.0 | n/a |
| Ease of use | 2.5 | 3.5 |
| 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
pgvectorscale
pgvectorscale adds a StreamingDiskANN index to pgvector, letting PostgreSQL handle very large vector collections at high speed.
- Keeps everything in PostgreSQL
- Handles very large collections
- Big speedup over plain pgvector
Key differences
Milvus is vector database, while pgvectorscale is postgreSQL extension. Their licenses differ (Apache-2.0 vs PostgreSQL), which matters if you ship a commercial product. Milvus leans more advanced-friendly, whereas pgvectorscale is more suited to intermediate users. They also differ in how they run (Self-hosted vs Yes). In short, Milvus fits teams needing billion-scale vector search, and pgvectorscale fits scaling pgvector past a few million rows.
Which should you choose?
Choose Milvus for teams needing billion-scale vector search. Choose pgvectorscale for scaling pgvector past a few million rows.
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 pgvectorscale easier to use?
pgvectorscale is generally the easier of the two to get started with, while Milvus rewards more setup with more control.
Are Milvus and pgvectorscale free?
Milvus is free and open source (Apache-2.0), and pgvectorscale is free and open source (PostgreSQL). Neither charges for the core software.
Can I run Milvus and pgvectorscale locally?
Milvus: self-hosted · pgvectorscale: yes. Both can be used without sending your data to a third-party cloud where their setup allows.
Milvus vs pgvectorscale — which should I pick in 2026?
Choose Milvus for teams needing billion-scale vector search. Choose pgvectorscale for scaling pgvector past a few million rows.
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