Astra DB

Astra DB is a managed vector database that stores embeddings alongside traditional data in Apache Cassandra. It handles semantic search, similarity matching, and AI-powered recommendations natively through a simple API. The platform scales to millions of vectors with sub-millisecond search latency and includes built-in RAG (retrieval-augmented generation) support for LLM applications.

Best for applications incorporating generative AI features or semantic search. Astra DB appeals to developers building recommendation engines, AI chatbots, or search systems that need to store and query embeddings at scale without managing infrastructure.