Chroma is an open-source AI-native vector database that powers semantic search, RAG applications, AI agents, and long-term memory for millions of developers, featuring built-in support for vector search, full-text (BM25 + SPLADE), regex, metadata filtering, and hybrid capabilities optimized for object storage. Its Chroma Cloud offers zero-ops scaling, automatic tiering, and up to 10x cheaper storage, while the self-hosted version (Apache 2.0) is fully free. The database has 15M+ monthly downloads, 27k+ GitHub stars, and is used in 90k+ open-source projects. It provides high throughput and low-latency queries even on billions of vectors, with enterprise options including BYOC, private networking, and SOC 2. Potential downsides include that the self-hosted version requires management for very large-scale deployments, some advanced enterprise features are paid, and embedding quality remains critical for best results. The overall verdict is 4.8/5 stars.