Qdrant

Qdrant is a high-performance, open-source vector database written in Rust, designed for production-grade similarity search and neural network matching. It excels in developer experience with a clean API, comprehensive filtering capabilities, and efficient payload indexing that allows complex queries combining vector similarity with metadata conditions. Qdrant supports quantization for reduced memory usage and faster search, making it particularly cost-effective for large-scale deployments. The platform offers both cloud-managed and self-hosted options with a generous free tier.