Docs & PDF Q&A

PageIndex

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

Visit official page 日本語で詳しく見る

Popularity

★ 35k

Last update

August 2026

License / pricing

MIT

What it does

Most document-grounded AI splits text into chunks and matches on similarity. PageIndex instead builds a table-of-contents-like structure and reasons its way to the relevant section - closer to how a person finds a passage in a book, which helps with long or highly structured documents. It is a developer component with Python and command-line setup, though the maintainers host a chat interface where you can see how it behaves before installing. A paid service exists alongside it.

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.

PageIndex FAQ

Is PageIndex free?: PageIndex 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 PageIndex?: It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.
Does PageIndex work on a phone?: No. It needs a computer.
Can I use PageIndex 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
PageIndex (this page)	Required	Required	Yes	No	Yes
LlamaIndex	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.

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What it does

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.

PageIndex FAQ

Is PageIndex free?

PageIndex 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 PageIndex?

It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.

Does PageIndex work on a phone?

No. It needs a computer.

Can I use PageIndex 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
PageIndex (this page)	Required	Required	Yes	No	Yes
LlamaIndex	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.