Milvus

Milvus is a highly scalable open-source vector database designed for billion-scale similarity search, built to power semantic search, recommendation, and retrieval-augmented generation. Its cloud-native architecture separates compute and storage, supporting multiple index types and distributed deployments so it can handle enormous vector collections with high throughput and availability. Zilliz, the company behind Milvus, offers Zilliz Cloud as a fully managed service.

Milvus is often chosen by teams with very large datasets or demanding performance needs. It supports GPU acceleration, a range of ANN index algorithms, and flexible consistency levels, letting engineers tune the trade-off between speed, recall, and cost. A large open-source community and strong framework integrations make it a mature backbone for production AI systems.