r/vectordatabase
What’s your go‑to free vector DB for AI agent projects right now?
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I’ve been comparing free vector databases for AI agent and RAG projects and have realized the free-tier label hides many differences. It helps to group them by model first. Libraries like Chroma and LanceDB have no service to meter, so the limits are really your own disk and infrastructure. Open-source servers like Qdrant, Weaviate, Milvus, and pgvector are uncapped when you self-host and only metered when you use a managed version. Pinecone is managed only. The Starter plan gives you 2GB of index storage, five indexes, 2M write units, and 1M read units a month, all in us-east-1. There's no self-hosted option at all, so if data can't leave your infra, it's out of the picture before storage enters the full picture. From that angle, the trade-offs start to make more sense. Weaviate Cloud sandbox is great for quick experiments but expires after 14 days. Zilliz free gives you up to 2 collections and 1M vectors, which is enough for many prototypes. Quadrant Cloud is free with 1 GB RAM, 4 GB disk, and a single node works well up to roughly 1M vectors at 768d before you feel the limits. Pinecone is fully managed, so it’s a good fit if you’re okay staying in their cloud and don’t need self-hosting. A couple of practical notes I ran into. With Chroma, deletes don’t shrink the HNSW index, so heavy write-and-evict workloads can lead to extra compaction work down the line. With...
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[comment u/DudaFromWeaviate] Hi there! Duda from Weaviate here :) We now have a free forever option.