Getting started with Underanchor

Underanchor is a LaTeX editor where every claim in your document is anchored to a specific paragraph of a source PDF — a thesis, an article, a report, a legal brief: any text that has to show where it comes from. Click a citation and the PDF opens on the right page with that paragraph highlighted. Sentences without support are marked [SIN FUENTE] (“no source”).

The app is in English or Spanish (Settings → Language: Automatic, Español, English). Labels below are written in English, with the Spanish label in brackets.

Three first steps

1. Upload your PDFs — go to Libraries (Bibliotecas) and drag PDFs into a library, or import them from Zotero. Each paragraph becomes a citable unit. See Libraries and PDFs.
2. Create a project — on Home (Inicio), click Create project (Crear proyecto), give it a name and pick the library it will cite from. See Projects and the LaTeX editor.
3. Connect your AI — account menu → Connect an AI (Conectar una IA). Claude or ChatGPT then searches your library and writes each sentence with its source. See Connect Claude or ChatGPT.

Home shows a Getting started (Primeros pasos) card until all three are done.

The example project

A new, empty account gets an example library (“Ejemplo · Calidad del aire y movilidad”) and an example project with anchored sentences, unanchored ones and a comment. It does not count towards your plan. Remove it from Home with Remove the example (Quitar el ejemplo).

The guided tour

A 12-step tour opens on first login. Replay it any time: account menu → Take the tour (Ver el recorrido).

Underanchor never calls an AI model

The AI is yours (your Claude or ChatGPT subscription), connected through an MCP connector. Underanchor stores your PDFs, anchors and LaTeX; it never sends your text to a model itself.