Case study · GitHub signal → priced round
Weaviate — OSS vector database to a $50M Index Series B
Weaviate's open-source vector database hit takeoff slope before Index Ventures led the $50M Series B.
At a glance
- Company
- Weaviate
- Sector
- AI / vector database
- Primary repo
- github.com/weaviate/weaviate
- Trigger window
- first half 2023
- Stars at trigger
- ~7K stars at trigger window
- Announced raise
- $50M Series B (Index) (2023-04-19)
- Lead investor
- Index Ventures
- Time-to-money read
- OSS vector DB star slope ramped 6 months before the Series B
Weaviate is the open-source counter to Pinecone's hosted-first approach. The repo grew through 2022 with sustained release cadence, and the LLM wave in late 2022 hit just as Weaviate had matured the API for production use.
By Q1 2023 the star slope, release cadence, and contributor count were all accelerating. Index Ventures led the Series B in April — well before the vector-DB category had stabilized.
The 'OSS-first vector DB' pattern shows up across Qdrant, Milvus, and Chroma — Weaviate is the early breakout that mapped the category.
Signals that would have flagged this pre-raise
- Star slope:Inflection through late 2022 into Q1 2023
- Release cadence:Multiple tagged releases per month
- LLM-wave timing:Mature API at peak of LLM tutorial growth
Repositories
Frequently asked questions
Pinecone vs Weaviate — different signal shapes?
Yes. Pinecone's signal was SDK install velocity; Weaviate's signal was star slope on the OSS engine. Different category positions surface different leading indicators.
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