LanceDB
Hacker ApprovedRanked 5 of 10 vector databases by recommenders
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.
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.
14 people gave an opinion
- recommend it
- 12
- criticize it
- 2
- approval share
- 86%
Recommended in 7 of 13 months
- November 2025: not recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: recommended
- April 2026: not recommended
- May 2026: not recommended
- June 2026: not recommended
- July 2026: not recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: recommended
- November 2026: not recommended (month in progress)
Why it carries the badge
- 12 people recommend itNeeds 10 or more, met.
- 6 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 7 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Keeps grounding consistent across chains
“keeping shared context grounded is probably what prevents most of those drift issues”
Comment from 26 Feb 2026 in “Show HN: OpenSwarm – Multi‑Agent Claude CLI Orchestrator for Linear/GitHub” “LanceDB keeps the grounding consistent across the chain”
Comment from 26 Feb 2026 in “Show HN: OpenSwarm – Multi‑Agent Claude CLI Orchestrator for Linear/GitHub”
What people warn about
Each mark is one comment
Slows down badly at scale
“Inserts become increasingly slow. Became >10sec for a chat completion insert after 10_000 entries on k8s Longhorn atop NVMe.”
Comment from 12 Feb 2026 in “Lance table format explained simply, stupid (Animated)” “as soon we tried production workloads it would get extremely slow”
Comment from 10 Feb 2026 in “Lance table format explained simply, stupid (Animated)”
Other vector databases people recommend
The four most recommended other vector databases, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Qdrant | 22 | 3 | 88% | 10 | — | Approved |
| Chroma | 17 | 5 | 77% | 7 | — | Approved |
| sqlite-vec | 17 | 3 | 85% | 7 | — | Approved |
| turbopuffer | 13 | 2 | 87% | 8 | — | Approved |
| LanceDBThis page | 12 | 2 | 86% | 7 | — | Approved |
What people said
12 of the 15 comments that mention it, newest first. Each links to the original comment.
“I see an interesting opportunity in this combination”
“Maybe only Lancedb looks promising, but it's too heavy for my needs.”
“I've really liked lancedb for similar use cases. Not just that it is OSS.”
“This is targeted more at smaller chat server use cases that put the admins in the drivers seat.”
“LanceDB keeps the grounding consistent across the chain”
“keeping shared context grounded is probably what prevents most of those drift issues”
“Inserts become increasingly slow. Became >10sec for a chat completion insert after 10_000 entries on k8s Longhorn atop NVMe.”
“I've used LanceDB for a few projects in production now and it's worked out reasonably well.”
“as soon we tried production workloads it would get extremely slow”
“the overhead of managing a vector index wasn't worth the hallucinations”
“the embedded lancedb is convenient and has benchmarks”
“LanceDB has a similar mechanism for operating on remote vector embeddings/text search.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.