Qdrant
Open SourceVector Databases
Open-source vector database built in Rust.
What it’s for
Qdrant delivers fast similarity search with rich payload filtering — the exact combination production RAG pipelines usually need. Self-host it with Docker or use the managed cloud, with clients for Python, JS/TS, Rust and Go.
How to use it
docker run -p 6333:6333 qdrant/qdrant, then use a client to create a collection, upsert vectors with JSON payload, and run filtered top-k searches over the REST API.
Pricing
Open source (Apache 2.0) and free to self-host. Qdrant Cloud has a free 1 GB tier, then usage-based pricing.