Milvus vs pgvector: Head-to-Head Comparison

Quick Verdict

Milvus is the better pick for very large datasets that need distributed vector search. pgvector is the better pick for teams already on Postgres who want vectors next to relational data.

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At a Glance

Feature	Milvus	pgvector
Best For	Very large datasets that need distributed vector search	Teams already on Postgres who want vectors next to relational data
Pricing	Free open source; paid managed cloud	Free and open source
Free to Start	Yes	Yes
License	Open source	Open source
Deployment	Self-hosted or managed cloud	Postgres extension (self-hosted or managed Postgres)
Link	Visit Milvus	Visit pgvector

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Detailed Breakdown

Milvus

Cloud-native vector database built for billion-scale search

Pros:

• Designed for billions of vectors
• Many index types including GPU indexes
• Managed option via Zilliz Cloud

Cons:

• Complex distributed deployment
• Heavier operational footprint

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pgvector

Vector similarity search extension for PostgreSQL

Pros:

• Keeps vectors alongside relational data
• Supported by most managed Postgres providers
• HNSW and IVFFlat indexes

Cons:

• Index tuning needed for large datasets
• Fewer vector-specific features than dedicated engines

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Key Differences

• Positioning: Milvus — cloud-native vector database built for billion-scale search. pgvector — vector similarity search extension for PostgreSQL.
• Both share the same licensing model (open source), so the decision comes down to features and workflow fit.
• Deployment: Milvus — self-hosted or managed cloud. pgvector — Postgres extension (self-hosted or managed Postgres).
• Pricing: Milvus — free open source; paid managed cloud. pgvector — free and open source.
• Signature strength: Milvus — designed for billions of vectors. pgvector — keeps vectors alongside relational data.

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Frequently Asked Questions

Is Milvus better than pgvector?

It depends on your requirements. Milvus is a strong fit for very large datasets that need distributed vector search, while pgvector suits teams already on Postgres who want vectors next to relational data.

Is Milvus free to use?

Yes, you can start with Milvus for free. Pricing model: Free open source; paid managed cloud.

Is pgvector free to use?

Yes, you can start with pgvector for free. Pricing model: Free and open source.

Can I self-host Milvus or pgvector?

Milvus can be self-hosted. Deployment options: self-hosted or managed cloud. pgvector can be self-hosted. Deployment options: Postgres extension (self-hosted or managed Postgres).

What are the main drawbacks of Milvus and pgvector?

Milvus: complex distributed deployment; heavier operational footprint. pgvector: index tuning needed for large datasets; fewer vector-specific features than dedicated engines.