MongoDB Atlas
A sensible choice if your application data already lives in MongoDB and you want vector and hybrid search next to it instead of syncing into a second system. It is a general-purpose database first, so it makes less sense as a standalone vector store for a team with no MongoDB footprint.
Pros
- Vector, lexical and hybrid search run next to the operational data
- Free cluster and an hourly Flex tier capped at $30/month
- Runs on AWS, Azure and Google Cloud, with self-managed editions
- Search nodes let vector workloads scale separately from the database
Cons
- Hourly metered pricing makes monthly cost hard to forecast
- Cost grows quickly on Dedicated clusters compared with single-purpose vector stores
- Newer pieces such as Atlas Infinite and Atlas Agent Engine are still in preview