Pinecone

Pinecone is a managed vector database built for similarity search over embeddings. It handles scaling, real-time index updates, metadata filtering, and common similarity metrics (cosine, euclidean, dot product) so you don't run the infra yourself. It's the default "just works" choice for RAG, recommendation engines, and dedup at scale, and integrates cleanly with LangChain and LlamaIndex. The main tradeoff vs Qdrant is control: you trade self-hosting flexibility for zero ops.