A side-by-side of two vector databases for building AI agents — live GitHub data, languages, and what each is best at.
Short answer: DuckDB leads pgvector vs DuckDB by community traction (★ 40k vs ★ 23k). Pick pgvector for RAG on existing Postgres; pick DuckDB for analytical + vector search.
✓ Live data verified
| pgvector | DuckDB | |
|---|---|---|
| GitHub stars | ★ 23k | ★ 40k |
| Language | C | C++ |
| Category | Vector databases | Vector databases |
| Best for | RAG on existing Postgres | analytical + vector search |
| Repository | pgvector/pgvector | duckdb/duckdb |
pgvector and DuckDB are both credible choices. By community traction, DuckDB leads (★ 40k). Pick pgvector for RAG on existing Postgres; pick DuckDB for analytical + vector search.
Both are credible vector databases. By community traction DuckDB leads (★ 40k). Pick pgvector for RAG on existing Postgres; pick DuckDB for analytical + vector search.
pgvector is Vector similarity search inside Postgres — keep embeddings next to your relational data.. DuckDB is In-process analytical database whose vss extension adds an HNSW vector index — vector search alongside your columnar analytics..
DuckDB has more — ★ 40k vs ★ 23k (live counts).
Often yes — many teams combine vector databases. Check each tool's docs for interop; they solve overlapping but not identical problems.
pgvector is primarily C; DuckDB is primarily C++.
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