# Underanchor

> Underanchor is a LaTeX editor where every sentence is anchored to the exact paragraph of the source PDF it comes from. Bring your own AI (Claude, ChatGPT) via MCP; your supervisor reviews the text and the source side by side.

Every claim, one click from its source. Underanchor does not include an AI model and never calls one: users connect their own Claude or ChatGPT through the MCP connector at https://underanchor.com/mcp. A sentence with no support in the user's library is not written instead of being filled in. The .tex is standard LaTeX; anchors live in a separate file.

## Docs

- [Getting started with Underanchor](https://underanchor.com/docs/getting-started/): What Underanchor does and the three first steps — upload PDFs, create a project, connect your AI.
- [Libraries and PDFs](https://underanchor.com/docs/libraries/): Upload PDFs or import them from Zotero, organise them in libraries and folders, read, highlight and annotate your sources.
- [Projects and the LaTeX editor](https://underanchor.com/docs/projects/): Create or import a project, choose its library and language, manage files, keep versions and export standard LaTeX as a .zip.
- [Search and anchor citations](https://underanchor.com/docs/anchoring/): Find the paragraph that supports a sentence, anchor and cite it, what happens to sentences without a source, citation links and the provenance report.
- [Compile and download the PDF](https://underanchor.com/docs/compile/): Compile the LaTeX project in one click, jump between PDF and source, fix compilation errors and download the PDF.
- [Connect Claude or ChatGPT](https://underanchor.com/docs/connect-ai/): Add Underanchor to Claude or ChatGPT in three steps (copy the link, paste it as a custom connector, click Allow), choose read-only or read-and-write, revoke access and ask your AI to work on a project.
- [Share with a reviewer or co-author (roles)](https://underanchor.com/docs/supervisor-review/): Invite someone by email or with a link and choose what they can do - review (comment and suggest), edit together in real time, or only view; they see only the cited paragraphs.
- [Comments and suggestions](https://underanchor.com/docs/comments/): Comment on a fragment, reply in threads, resolve comments, and handle suggested changes from your reviewer or your AI.
- [Account and settings](https://underanchor.com/docs/account/): Sign in with email or Google, reset your password, see your account limits, change language and settings, download your data, delete your account and send feedback.
- [Frequently asked questions](https://underanchor.com/docs/faq/): Common questions about privacy, other LaTeX editors, Zotero, languages, scanned PDFs and how Underanchor differs from chatting with PDFs.
- [Shared libraries and co-authors with a library](https://underanchor.com/docs/shared-libraries/): Give other people access to one of your libraries (view or edit) or to the library of a project you share, so a team can search, cite, upload and highlight together.

## Product

- [Home](https://underanchor.com/): what Underanchor does
- [Pricing](https://underanchor.com/pricing/): plans and limits
- [About](https://underanchor.com/about/): who makes Underanchor and the rules it follows
- [Full documentation](https://underanchor.com/llms-full.txt): every docs page in one Markdown file

## Optional

- [Precios en español](https://underanchor.com/es/precios/): planes y topes en castellano