Pinecone

Pinecone is a fully managed, cloud-native vector database for developers and AI/ML teams that need fast similarity search over high-dimensional embeddings for production search, recommendations, and RAG.

Key capabilities include:

• Vector similarity search at scale using approximate nearest neighbor (ANN) indexing to query large datasets with low latency.
• Real-time ingestion and updates via upsert operations, making newly written vectors queryable within seconds.
• Hybrid retrieval that blends dense vector search with sparse keyword (full-text) search, plus metadata filtering for precise results.
• Multi-tenancy and operations features such as namespaces, automated scaling and replication, and data recovery options (backups and collections).

Pricing: Free tier available, then pay as you go (see pricing page for details).

What makes it notable: it combines a language-agnostic API with managed infrastructure (including serverless options) and common AI ecosystem integrations such as LangChain, LlamaIndex, and Haystack, plus hosted inference options for embeddings and reranking to support end-to-end retrieval workflows.