Vector Database · decision tool
Which vector database should I use?
Answer your requirements — vector count, metadata filtering, existing Postgres, deployment, ops capacity — and get a capability-fit verdict across pgvector, Pinecone, Qdrant, Weaviate, Milvus, Chroma and turbopuffer. Not a per-vector price ranking (their billing units are incompatible).
Capabilities verified 2026-07-17 against official documentation · fit weights are our estimates (see methodology) · share the URL to share your configuration
As of Jul 2026, for this page's default requirements, pgvector (Postgres) is the clear pick at 86% capability fit (Pinecone: 70%). This is a capability-fit decision, not a price ranking — StackSays does not invent a unified dollar comparison across these tools' incompatible billing units. Change any requirement below and the verdict recomputes.
Your requirements
The verdict updates as you change these. Share the URL to share your answers.
Clear pick
pgvector (Postgres) (86% fit)
Ranked by capability fit
pgvector (Postgres) vs Pinecone — the tradeoffs that decide it
- Reuse existing Postgres: pgvector (Postgres) — Runs inside the Postgres you already operate (Supabase/Neon/RDS) — no new service, $0 extra infra. Pinecone — Adds a separate vector service to run and pay for, on top of your Postgres.
When to pick Pinecone instead: when the lines above where it leads matter more to you than the ones where pgvector (Postgres) leads. Change the inputs to see the ranking flip.
This is a capability-fit decision, not a price ranking — these tools bill in incompatible units (per-search vs per-RAM cluster vs per-PB scanned) and several publish rates only in their own calculators, so StackSays does not invent a unified dollar comparison. Every score above traces to a documented capability; see Data sources below.
At a glance
| Tool | Deployment | Open source | Verified |
|---|---|---|---|
| pgvector (Postgres) | Managed or self-hosted | Yes | 2026-07-17 |
| Pinecone | Managed only | No | 2026-07-17 |
| Qdrant | Managed or self-hosted | Yes | 2026-07-17 |
| Weaviate | Managed or self-hosted | Yes | 2026-07-17 |
| Milvus / Zilliz | Managed or self-hosted | Yes | 2026-07-17 |
| Chroma | Managed or self-hosted | Yes | 2026-07-17 |
| turbopuffer | Managed only | No | 2026-07-17 |
Data sources
| Tool | Source | Verified |
|---|---|---|
| pgvector (Postgres) | pgvector documentation (capabilities) | 2026-07-17 |
| Pinecone | Pinecone documentation (capabilities) | 2026-07-17 |
| Qdrant | Qdrant documentation (capabilities) | 2026-07-17 |
| Weaviate | Weaviate documentation (capabilities) | 2026-07-17 |
| Milvus / Zilliz | Milvus documentation (capabilities) | 2026-07-17 |
| Chroma | Chroma documentation (capabilities) | 2026-07-17 |
| turbopuffer | turbopuffer documentation (capabilities) | 2026-07-17 |
A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.