pgvector
An open-source extension that adds vector similarity search to PostgreSQL, so you can store embeddings alongside your existing relational data with no extra service. The simplest path if you already run Postgres.
Strengths
- Vector search inside PostgreSQL, alongside your existing data
- No new service to run if you already use Postgres
- Permissively licensed and very widely deployed
Weaknesses
- Tuning indexes for large collections takes real Postgres knowledge
- Very large or high-throughput workloads may outgrow a single database
- Not as specialised as a purpose-built vector engine
At a glance
- Licence
- PostgreSQL License
- Pricing
- Free
- Platforms
- macOS, Windows, Linux, Docker
- GPU required
- No
Links
Entry last verified 30 July 2026.