pgvectorpgvector
Open-source vector similarity search for Postgres
TL;DR · 30-second scan
pgvector (C) — Open-source vector similarity search for Postgres
You are already on Postgres and want vector search without operating a second database.
AI & ML · Database & ORM
Vector search inside Postgres. ~12k stars and dominant in 2026 as the boring-but-correct default. If you already have Postgres (Supabase, Neon, RDS), do not add another database — just install this extension. Works for the vast majority of RAG apps.
You are already on Postgres and want vector search without operating a second database.
You need billion-scale vector search with millisecond latency — a dedicated vector DB is worth the operational cost.
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