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Vector Databases comparison · 2026
Milvus (82) and pgvector (77) are closely matched — this is one of the tightest Vector Databases comparisons in our database, with just 5 points separating them overall. Milvus leads on Scalability (98 vs 65), while pgvector has the edge on Developer UX (80 vs 65). The two are closest on Ecosystem, where the gap is just 5 points. Both offer a free tier, making either a low-risk starting point. Use the radar chart and dimension table below to find which fits your specific priorities best.
Milvus
Enterprise-grade open-source vector database at massive scale
82/100
pgvector
Vector search as a Postgres extension — no new database needed
77/100
Radar comparison
Milvus
82
pgvector
77
Developer UX
SDK quality, indexing API, and setup speed.
Query Performance
ANN search speed and recall accuracy at scale.
Scalability
Index size limits and horizontal scaling for billions of vectors.
Price / Value
Cost per million vectors and free tier generosity.
Hybrid Search
Combining vector similarity with keyword/metadata filtering.
Ecosystem
LangChain/LlamaIndex integrations and framework support.
Overall Score
Based on our independent scoring across 6 dimensions, Milvus scores 82/100 overall versus pgvector's 77/100 — a 5-point margin. Milvus leads on Scalability in particular. That said, pgvector may still be the right choice if the dimensions where it scores higher match your specific priorities — the radar chart above shows the full profile side by side.
Both Milvus and pgvector offer a free tier, so entry-level cost is not a differentiating factor. Compare the feature and usage limits of each free plan to see which gives you more headroom before a paid upgrade is needed.
Milvus scores higher on Scalability — 98/100 versus 65/100 for pgvector. If scalability is your primary decision criterion, Milvus is the stronger choice in this head-to-head.
Switching between vector databases tools is generally possible but involves migration effort: exporting your data or configuration from Milvus, re-importing or reconfiguring in pgvector, and updating any API integrations or environment variables in your codebase. The effort scales with how deeply embedded the tool is in your stack. Test pgvector on a non-production project first before migrating.
Milvus (82/100) is the better fit for teams who prioritise scalability — its strongest dimension — and who want a free entry point. pgvector (77/100) is the better fit for teams who prioritise price / value and want a free entry point. If both dimensions matter equally, the overall score winner (Milvus) is the safer default choice.
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