Chroma

Chroma is an open-source vector database optimized for embeddings with billion-scale performance. 2025 Rust-core rewrite delivers 4x faster writes and queries while enabling true multithreading without Python GIL bottlenecks. Features include multi-modal embeddings for cross-media search, metadata storage for flexible querying, HNSW indexing for fast semantic similarity, and WASM browser support. Pass your own embeddings, embedding functions, or let Chroma handle embedding automatically. Python and JavaScript integration with enhanced garbage collection for production deployments.