Weaviate

Weaviate is a standout open-source vector database that has quickly become one of the top choices for AI-native search and retrieval-augmented generation (RAG) workflows. Its built-in vectorization modules eliminate the need to manage embedding pipelines separately, and hybrid search combining vector and keyword approaches works impressively well out of the box. The GraphQL-based API is intuitive, and multi-tenancy support makes it production-ready for SaaS applications.

The freemium cloud offering with serverless options lowers the barrier to entry, while self-hosting gives full control for teams with specific infrastructure requirements. Integration with LangChain, LlamaIndex, and major LLM providers makes RAG implementation straightforward.

On the limitations side, Weaviate can be resource-intensive at scale compared to lighter alternatives like Qdrant, and the learning curve for advanced schema configurations is notable. Its data analysis capabilities are more focused on similarity search than traditional analytics, so it's best paired with dedicated analysis tools for broader use cases. Overall, an excellent choice for teams building semantic search and RAG applications.