Vector Databases & Retrieval Infrastructure
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Storage and search for embeddings, used to give a model access to information it was never trained on. Purpose-built vector databases sit here beside established general-purpose databases and search engines that have added vector indexes. Choosing between those two is the central decision in the space.
What to compare
Weigh a dedicated vector store against a vector index in a database you already run in production. Compare index types and their recall-versus-latency trade-offs, hybrid keyword-plus-vector search, metadata filtering, and whether you can self-host. At small scale the general-purpose option is very often enough.
20 companies in this category
ChromaOpen-source embedding database designed for LLM applications.
Elastic / ElasticsearchWidely used search engine with vector/hybrid search support.
LanceDBEmbedded, serverless vector database built on the Lance data format.
MarqoEnd-to-end vector search engine combining embeddings and retrieval.
MongoDB Atlas Vector SearchVector search built into MongoDB's managed Atlas platform.
Neo4jLeading graph database, also supports vector indexes for GraphRAG.
OpenSearchOpen-source search and analytics suite, an Elasticsearch fork, with vector search.
PineconeManaged vector database purpose-built for similarity search at scale.
QdrantOpen-source vector database written in Rust, focused on performance.
Redis (vector search)In-memory database with vector search capabilities for RAG use cases.
SingleStoreDistributed SQL database with native vector search support.
TileDBUniversal database engine supporting vector search on multi-dimensional data.
TurbopufferObject-storage-backed vector database built for cost efficiency at scale.
Upstash VectorServerless vector database from the Upstash Redis/Kafka team.- ValdHighly scalable open-source distributed vector search engine.
VectaraManaged RAG-as-a-service platform with built-in vector search.
VespaYahoo/Verizon-originated engine for search, recommendation, and vector retrieval.
WeaviateOpen-source vector database with built-in hybrid search.
Zilliz / MilvusManaged service for Milvus, a popular open-source vector database.- pgvectorOpen-source PostgreSQL extension adding vector similarity search.