pgvector vs Milvus: Which is Better in 2026?
Choosing between pgvector and Milvus comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Milvus is our overall Vector Databases pick. Pick pgvector if you need data & databases.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
pgvector
Vector similarity search for PostgreSQL
Best for you if:
- • You want native PostgreSQL
Milvus
Open-source vector database for AI
Best for you if:
- • You want high performance
| At a Glance | pgvector | Milvus |
|---|---|---|
Starts at | Free 100% free | Free 100% free |
Category | Data & Databases Vector Databases | Vector Databases Data & Databases |
Rating | n/a | 4.8/5 Capterra 4.8 · G2 4.7 310 reviews |
Free plan | Yes | Yes |
Watch out for | n/a | Overage fees for vCUs on Serverless tier |
Choose pgvector or Milvus?
Choose pgvector if
- You want native PostgreSQL
- You want no separate service
- You work in data & databases, not vector databases
Choose Milvus if
- You want high performance
- You want scalable
- You work in vector databases, not data & databases
In-Depth Analysis
pgvector
Vector similarity search for PostgreSQL
pgvector's pricing is exceptionally generous, being entirely free and open-source.
Strengths
- Pro: Native PostgreSQL
- Pro: No separate service
- Pro: Open source
Weaknesses
- Con: PostgreSQL only
- Con: Limited compared to specialized DBs
Key features
Milvus
Open-source vector database for AI
Milvus offers a very generous pricing model, especially with its robust open-source option and the Zilliz Cloud Free tier providing 5GB storage and 2.5M vCUs/month at no cost.
Watch out
Overage fees for vCUs on Serverless tier
Strengths
- Pro: High performance
- Pro: Scalable
- Pro: Open source
- Pro: Good for large scale
- Pro: Active development
Weaknesses
- Con: Complex operations
- Con: Heavy resource usage
- Con: Learning curve
- Con: Kubernetes recommended
- Con: Documentation dense
Key features
Pricing: pgvector vs Milvus
| Plan | pgvector | Milvus |
|---|---|---|
| Tier 1 | Free Open Source | Free Open Source |
| Tier 2 | N/A | Free Zilliz Cloud Free |
| Tier 3 | N/A | Pay-as-you-go Zilliz Serverless |
| Tier 4 | N/A | $99 Zilliz Dedicated |
Pricing verified from each vendor's public pricing page. Compare in detail on pgvector pricing and Milvus pricing.
Key Takeaways
Milvus
- Completely free
- Our pick for this comparison
pgvector
- Better fit for data & databases
The Bottom Line
Milvus is our overall Vector Databases pick.
Frequently Asked Questions
Is pgvector or Milvus better in 2026?
Milvus is our overall Vector Databases pick. Pick pgvector for data & databases workflows (main strength: native PostgreSQL). Pick Milvus for vector databases workflows (main strength: high performance).
What are pgvector and Milvus used for?
pgvector: Vector similarity search for PostgreSQL. Milvus: Open-source vector database for AI.
What does pgvector cost vs Milvus?
pgvector is free. Milvus's paid plans start at Free (Zilliz Dedicated).
What's the main difference between pgvector and Milvus?
pgvector's main strength: native PostgreSQL. Milvus's main strength: high performance.