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Editorial comparison for operators. Ratings are sample data unless verified.
| Attribute | LlamaIndex | Weaviate |
|---|---|---|
| Type | tool | tool |
| Summary | Open-source data framework for connecting custom data sources to LLM applications. LlamaIndex simplifies RAG pipeline construction and LLM data indexing. | Open source vector database for semantic search and AI applications. Weaviate enables teams to build scalable vector search at scale with native support for generative AI integrations. |
| Pricing | free · See vendor site — sample data | freemium · See vendor site — sample data |
| Free trial | No / not listed | No / not listed |
| API | Yes | Yes |
| Open source | Yes | Yes |
| Editor rating | — | — |
| Categories | AI Infrastructure, Data & Analytics, Developer Tools | Data & Infrastructure, AI & Machine Learning |
| Key features | 100+ pre-built data connectors for loading from files, databases, APIs, and cloud storage · Flexible document chunking and parsing with support for multiple file formats · Multiple index types including vector, keyword, tree, and SQL indices · Query engines with automatic routing and response synthesis · Agent framework for multi-step reasoning and tool use | Vector storage and similarity search with configurable distance metrics (cosine, dot product, Euclidean) · Native integrations with OpenAI, Cohere, Hugging Face, and other embedding providers (verify on vendor site for current integrations) · Hybrid search combining vector similarity with keyword and metadata filtering · GraphQL and REST APIs for flexible querying and integration · Multi-tenancy support for isolating data across customers or projects |
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