Milvus
High-performance vector database — billion-scale AI similarity search.
Apache-2.0 alternative to Pinecone with HNSW/IVF/DiskANN indexing, GPU acceleration, and distributed architecture. Lite mode for development.
Qdrant
High-performance vector database — semantic search at scale.
Apache-2.0 alternative to Pinecone with HNSW indexing, payload filtering, and distributed deployment. Rust engine with REST/gRPC APIs.
Chroma
Rust-based vector database for AI — serverless cloud with hybrid and full-text search for embeddings, metadata, and RAG
Open-source vector database for AI search and retrieval
Weaviate
AI-native vector database with semantic search, RAG, and hybrid search for building AI agents and applications
AI-native vector database for intuitive applications
Compare Zilliz alternatives
Zilliz Cloud is the managed, hosted version of Milvus, offered by the company that created Milvus. It handles the operational overhead of running a vector database at scale, but it's a paid cloud service — the underlying engine is open source, so you can run the same technology yourself for free.
If you want to avoid Zilliz's hosted pricing entirely, Milvus is the open-source engine Zilliz Cloud is built on, so self-hosting it gives you the same core technology without the managed-service cost. Qdrant and Weaviate are worth comparing too if you're choosing a vector database from scratch rather than specifically replacing Zilliz, and Chroma is the simplest option for smaller-scale embedding workloads.
FAQ
Is there a free, open-source alternative to Zilliz?
Yes. Milvus is the open-source vector database that Zilliz Cloud itself is built on, so self-hosting it gets you the same underlying technology for free.
What's the best open-source alternative to Zilliz?
Milvus is the direct match since Zilliz Cloud is just a managed version of it. Qdrant or Weaviate are worth comparing if you want to evaluate other vector databases rather than self-hosting the same engine.
What are the top open-source alternatives to Zilliz?
Browse all open-source alternatives to Zilliz above, or explore the full AI & LLM category for more options.