Chat UIs, RAG & agentsMITPython

LlamaIndex

Data framework for connecting LLMs to your documents.

Stars: 52.5K
Forks: 8.3K
Open issues: 933
Last commit: 2026-10-14

Live from the GitHub API · updated 2026-10-15

What is LlamaIndex?

LlamaIndex specializes in ingesting, indexing and querying private data for RAG and agents, with loaders for hundreds of sources and advanced retrieval strategies.

Key features

Hundreds of data loaders (LlamaHub)
Advanced retrieval and query engines
Agent and workflow APIs

System requirements

Platforms: Windows · macOS · Linux
Python: 3.9+

How to install LlamaIndex

Summarized from the project’s README. Projects change quickly — check the GitHub page for the latest instructions.

pip

1
Install.
```
pip install llama-index
```

Index a folder and ask a question.

from llama_index.core import VectorStoreIndex, SimpleDirectoryReader

docs = SimpleDirectoryReader("data").load_data()
index = VectorStoreIndex.from_documents(docs)
print(index.as_query_engine().query("What is this about?"))

Strengths

Best-in-class RAG tooling
Clear docs

Limitations

Fast-moving APIs

LlamaIndex alternatives compared

Software	Stars	License	VRAM
LlamaIndex Data framework for connecting LLMs to your documents.	52.5K	MIT	—
LangChain The most widely used framework for building LLM applications.	147.8K	MIT	—
RAGFlow RAG engine built on deep document understanding.	92.3K	Apache-2.0	—
Open WebUI Self-hosted ChatGPT-style interface for Ollama and OpenAI-compatible APIs.	155.7K	Open WebUI License (BSD-3-Clause based)	—
LibreChat Open-source ChatGPT clone supporting every major AI provider.	45.7K	MIT	—
LobeChat Modern AI chat framework with plugins, knowledge base and agent market.	83.2K	LobeHub Community License	—

FAQ

Is LlamaIndex free?

Yes — LlamaIndex is open-source software released under the MIT license. Check the license (and any model weight licenses) before commercial use.

Does LlamaIndex run on Windows, Mac and Linux?

LlamaIndex supports: Windows, macOS, Linux.

How do I install LlamaIndex?

1. Install. 2. Index a folder and ask a question.

What are the best LlamaIndex alternatives?

Popular alternatives include LangChain, RAGFlow, Open WebUI, LibreChat. See the comparison table on this page.

Open-source chat UIs, RAG and AI agent platforms