🔧 PostgreSQL as a Vector Database: When to Use pgvector vs Pinecone vs Weaviate

"Should we use PostgreSQL as our vector database?"

I've heard this question a lot in 2026. pgvector is everywhere. Every Postgres instance now has vector search capabilities.

But is it actually better than Pinecone or Weaviate?

I tested all three with 10 million vectors (1536 dimensions, OpenAI embeddings). Here's what I found.







The...