Docs & PDF Q&A

LlamaIndex

Let AI answer questions from your own documents

Visit official page 日本語で詳しく見る

Popularity

★ 52k

Last update

August 2026

License / pricing

MIT

What it does

The go-to framework for connecting private data to language models: index your files and query them in plain language.

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

Screenshots & visuals

Before you start

Setup difficultySome setup needed
Command lineRequired
API keyRequired
Sends data onlineYes

Judged automatically from the project's own metadata. Always confirm on the official page.

LlamaIndex FAQ

Is LlamaIndex free?: LlamaIndex itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.
Do I need to install anything or write code to use LlamaIndex?: This is a library meant to be used from code. It is not a standalone app.
Does LlamaIndex work on a phone?: No. It needs a computer.
Can I use LlamaIndex commercially?: The licence is MIT, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

Tool	Command line	API key	Sends data out	Phone	Commercial use
LlamaIndex (this page)	Required	Required	Yes	No	Yes
PageIndex	Required	Required	Yes	No	Yes
kotaemon	Required	Required	Yes	No	Yes
LangChain	Required	Required	Yes	No	Yes

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

Other docs & pdf q&a tools

PageIndex

Retrieval that navigates a document's structure instead of chopping it up

kotaemon

An open tool for chatting with your documents

LangChain

The standard framework for building AI applications

llm-app

RAG templates that stay in sync with the documents behind them

Browse all tools Home

LlamaIndex FAQ

Is LlamaIndex free?

LlamaIndex itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.

Do I need to install anything or write code to use LlamaIndex?

This is a library meant to be used from code. It is not a standalone app.

Does LlamaIndex work on a phone?

No. It needs a computer.

Can I use LlamaIndex commercially?

The licence is MIT, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

Tool	Command line	API key	Sends data out	Phone	Commercial use
LlamaIndex (this page)	Required	Required	Yes	No	Yes
PageIndex	Required	Required	Yes	No	Yes
kotaemon	Required	Required	Yes	No	Yes
LangChain	Required	Required	Yes	No	Yes

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.