Vector database
The best vector database for RAG and semantic search is pgvector because it scores highest on our published formula (77.8/100): Adds vector search to the Postgres you already have, with no new service.
Close call: pgvector leads Qdrant by 0.1 points. A challenger has to beat the current pick by at least 1.0 points to take its spot (stability margin).
The job: “I need semantic search or RAG retrieval over embeddings.” · Last checked
pgvector
Adds vector search to the Postgres you already have, with no new service.
Not for: Very large or specialized vector workloads.
Pricing: Open source Postgres extension. source, checked 2026-10-19
Visit pgvector ↗Qdrant
Open-source vector database with a free cloud tier.
Not for: Small apps already on Postgres (see pgvector).
Pricing: Open source. Cloud free tier: single node, 0.5 vCPU / 1 GB RAM / 4 GB disk. source
Also considered
- Chroma (60.1/100): Easy open-source embedding store for prototypes.
Score breakdown
| Tool | Fit (editorial) ×0.4 | Adoption (GitHub stars) ×0.25 | Momentum (release freshness) ×0.2 | Attention (HN, 30d) ×0.15 | Score |
|---|---|---|---|---|---|
| pgvector | 4/5 → 0.75 | 23.4k★ → 0.818 | Oct 1, 2026 → 0.78 | 211 pts → 0.785 | 77.8 |
| Qdrant | 5/5 → 1 | 35.2k★ → 0.851 | Oct 5, 2026 → 0.823 | 0 pts → 0 | 77.7 |
| Chroma | 3/5 → 0.5 | 29.5k★ → 0.837 | Oct 17, 2026 → 0.96 | 0 pts → 0 | 60.1 |
Missing signals are dropped and the remaining weights re-normalized. See methodology. Signals fetched Oct 21, 2026.
FAQ
What is the best vector database for RAG and semantic search?
The best vector database for RAG and semantic search is pgvector because it scores highest on our published formula (77.8/100): Adds vector search to the Postgres you already have, with no new service.
What is the best alternative to pgvector?
Our runner-up is Qdrant (77.7/100). Open-source vector database with a free cloud tier. Not for: Small apps already on Postgres (see pgvector).
Who should not use pgvector?
Very large or specialized vector workloads.
How much does pgvector cost?
Open source Postgres extension. (checked 2026-10-19, source: https://github.com/pgvector/pgvector)
Related jobs
- Parse PDFs and docs for RAG: pick Docling
- Web scraping for LLMs: pick Firecrawl
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