LangChain vs Weaviate

LangChain

Weaviate

LangChain · 18 features

• Agents — Tool-using agents with reasoning loops.
• Chains (LCEL) — LangChain Expression Language — pipe primitives into chains.
• Checkpointers (LangGraph) — Persist agent state to SQL, Mongo, Redis, Postgres.
• Document Loaders — 150+ loaders for PDF, HTML, Notion, Google Drive, S3, GitHub, etc.
• Human-in-the-loop — Pause agent for approval, then resume.
• LangGraph — Stateful graph-based agent runtime. Durable, replayable, human-in-the-loop.
• LangGraph Platform — Managed hosting for LangGraph agents with state persistence.
• LangGraph Studio — Desktop IDE for debugging agent graphs.
• LangServe — Deploy chains as FastAPI endpoints.
• Memory — Buffer, summary, entity, vector memory stores.
• Output Parsers — Structured JSON, Pydantic schemas, function calling.
• Prompt Templates — Templating + partial filling + output parsers.
• RAG (Retrieval-Augmented Generation) — Standard patterns + 50+ retrievers.
• Streaming — First-class streaming at every layer.
• Subgraphs — Compose agent graphs hierarchically.
• Text Splitters — Recursive, token, semantic splitters for chunking.
• Tools — 400+ pre-built tools (web search, code, databases, APIs).
• Vector Store Integrations — 60+ vector DBs (Pinecone, Chroma, Weaviate, PGVector, Qdrant, Milvus).

Weaviate · 13 features

• Backups — S3, GCS, Azure Blob backup destinations.
• BYOC — Run managed Weaviate in your own cloud account.
• Compression (PQ/BQ/RQ) — Reduce vector memory footprint by up to 32x.
• Dynamic Indexing — HNSW + flat + dynamic index selection.
• Generative Search — Search + RAG answers in one API call.
• Hybrid Search — Combine BM25 + dense vector search in one query.
• Modular Vectorizers — 60+ plug-in vectorizers + generative AI modules.
• Multi-Tenancy — Per-tenant isolated vector stores in one cluster.
• Query Agent (AI) — Agentic natural-language query generator.
• RBAC — Role-based access control for collections + tenants.
• Replication — Multi-node async + sync replication.
• Self-Host (OSS) — BSD-3 licensed. Docker + k8s Helm.
• Structured Filters — Metadata filters pre + post vector search.