Back to AI Tools 
Back End Developer Trending Free & Open Source / Cloud paid
LlamaIndex
Data framework for connecting LLMs to your data
Overview
LlamaIndex is a data framework that helps you build LLM applications over your custom data. It provides tools for data ingestion, indexing, and querying — essential for building RAG applications.
Features
Data connectors (100+ sources)
Advanced indexing strategies
Query engines
Multi-modal support
Agent framework
LlamaCloud managed service
How to Get Started
Install with pip install llama-index (Python) or npm install llamaindex (JS/TS). Follow docs.llamaindex.ai to load your data and build a query engine.
Pricing
Free & Open Source / Cloud paid
View pricing detailsFAQ
What's the difference between LangChain and LlamaIndex?
LlamaIndex focuses on data indexing and retrieval (RAG), while LangChain is a broader framework for chains and agents. They can be used together.