Managed vector storeBest forA fully hosted index with nothing to operate, sized by usage.
Trade-offClosed source and cloud-only, so leaving means re-indexing somewhere else.
Used by 55 makers' products for this
Open-source vector storeOpen sourceFree tierFrom Usage-based, no minimumllms.txt Best forHeavy metadata filtering alongside vector search, self-hosted from one binary or on its managed cloud.
Trade-offOne more service to deploy and keep in sync with your main database.
Used by 18 makers' products for this
Open-source vector storeBest forHybrid search that mixes keyword and vector results, with built-in modules that can create embeddings for you.
Trade-offMore concepts and configuration to learn than simpler stores; some advanced features need a license key.
Used by 16 makers' products for this
Embedded / local-firstOpen sourceFree tierFrom Usage-basedllms.txt Best forPrototyping RAG on your laptop with a pip or npm install and no server to run.
Trade-offFor production you either run its server yourself or move to Chroma Cloud.
Used by 13 makers' products for this
Managed vector storeBest forVery large or many-tenant indexes where storing everything on object storage keeps cost down.
Trade-offNo free tier (paid plans have a monthly minimum), and it's cloud-only.
Used by 8 makers' products for this
Inside your databaseBest forApps already on Postgres that want vector search in the same database, joined with normal tables.
Trade-offIndex tuning and memory sizing are your job, and very large indexes can crowd out the rest of the database.
No maker product tracked for this yet
Embedded / local-firstBest forAn embedded vector database that stores vectors and data as files on local disk or object storage, with no server to run.
Trade-offMany concurrent writers need care, and the managed cloud is a separate paid product.
Used by 3 makers' products for this
Inside your databaseSelf-hostableFree tierFrom $0.011/hourllms.txt Best forApps already on MongoDB Atlas that want vector search on the same documents, with no second store to sync.
Trade-offVector search is most mature on Atlas; on self-hosted MongoDB it arrived later, so check your version and setup.
No maker product tracked for this yet
Open-source vector storeOpen sourceFree tierFrom Pay as you go (Zilliz Cloud Serverless)llms.txt Best forVery large collections — hundreds of millions of vectors and up — on a distributed open-source database, or managed as Zilliz Cloud.
Trade-offThe distributed deployment has many moving parts; for small apps it's more system than you need.
No maker product tracked for this yet
Embedded / local-firstOpen sourceFree tier
Best forA fast in-memory vector index library for research, batch jobs and apps that load their index at startup.
Trade-offA library, not a database — no metadata filtering service, persistence or updates beyond what you build.
No maker product tracked for this yet