LangExtract vs Weaviate

A side-by-side look at pricing, capabilities, pros, cons, and our editorial scores.

	LangExtract RAG	Weaviate RAG
Tagline	Google's open-source Python library for LLM-driven structured extraction from unstructured text, with source-grounded outputs.	Open-source vector DB with hybrid search and modules.
Category	RAG	RAG
Pricing	Free· Library is free (Apache-2.0); LLM API costs depend on chosen backend	Freemium· Free open-source; cloud from $25/mo
Model	Multi-model (Gemini, GPT-4/4o, Ollama-hosted local models)	Hosted vector DB (not an LLM)
Editorial score	—	8.4 / 10
Use cases	structured-extractiondocument-parsingentity-extractionlong-document-qaclinical-textlegal-document-parsing	self-hosted RAGhybrid search
Pros	Source grounding maps every extracted field back to its character span in the original text Handles long documents via chunking and multi-pass extraction Works with Gemini, OpenAI, and local Ollama models behind one API Built-in interactive HTML visualizer for reviewing extractions Apache-2.0 and pip-installable with no vendor lock-in	Hybrid search built in Self-host or cloud Module ecosystem GraphQL + REST APIs
Cons	Python-only; no hosted UI or no-code interface Quality and cost still hinge entirely on the backing LLM you choose Not an officially supported Google product, so SLAs are community-grade	More ops than Pinecone if self-hosted Smaller community
Website	pypi.org	weaviate.io

Pick LangExtract if

✅ Source grounding maps every extracted field back to its character span in the original text
✅ Handles long documents via chunking and multi-pass extraction
✅ Works with Gemini, OpenAI, and local Ollama models behind one API
✅ Built-in interactive HTML visualizer for reviewing extractions

Pick Weaviate if