# LanceDB

12 Hacker News commenters recommended LanceDB and 2 criticized it, November 2025 to November 2026. It was recommended in 7 of 13 months. It meets the Hacker Approved badge rule.

**Verdict:** Free open-source embedded vector database people use for RAG and production work. Critics say inserts slow at scale and it is heavy for small needs.

## Why people recommend it

- Keeps grounding consistent across chains (2 comments): "keeping shared context grounded is probably what prevents most of those drift issues" ([source](https://news.ycombinator.com/item?id=47161935)) "LanceDB keeps the grounding consistent across the chain" ([source](https://news.ycombinator.com/item?id=47162798))

## What people warn about

- Slows down badly at scale (2 comments): "Inserts become increasingly slow. Became >10sec for a chat completion insert after 10_000 entries on k8s Longhorn atop NVMe." ([source](https://news.ycombinator.com/item?id=46990452)) "as soon we tried production workloads it would get extremely slow" ([source](https://news.ycombinator.com/item?id=46962642))

## Alternatives hackers recommend

- [Qdrant](https://hackerapproved.com/p/qdrant.md): 22 recommend
- [Chroma](https://hackerapproved.com/p/chroma.md): 17 recommend
- [sqlite-vec](https://hackerapproved.com/p/sqlite-vec.md): 17 recommend
- [FAISS](https://hackerapproved.com/p/faiss.md): 9 recommend
- [zvec](https://hackerapproved.com/p/zvec.md): 8 recommend

## Cite as

Hacker Approved, "LanceDB", https://hackerapproved.com/p/lancedb/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).