Pinecone
The default managed choice when you want vector search without operating infrastructure, and serverless billing makes small projects cheap to start. Costs are metered per read/write unit, so query-heavy workloads need modeling up front - bills scale with success, and storage, egress and support are all separate lines.
Pros
- Serverless architecture separates storage from compute
- Free tier plus a $20 flat Builder plan lowers the entry cost
- Hosted embedding and reranking models reduce pipeline glue
- Enterprise controls: SSO, RBAC, audit logs, BYOC, HIPAA add-on
Cons
- Unit-based pricing is hard to forecast for spiky query loads
- Closed source, with BYOC reserved for the Enterprise tier
- Responsive support costs $29-250/month extra on lower tiers