disclosure: I am with the Milvus team.
Milvus positions itself as an open source vector similarity search engine built on top of various ANNS algorithms,including Faiss, Annoy, HNSW, etc.
As a vector similarity search engine server, Milvus is designed for easy to use, high reliability, easy to scale, and high performance. Milvus supports near real-time search, CRUD, WAL, data consistency, distributed deployment, high availability, and more.
Hope this answers your question.