Libritus

Desktop app that puts PDFs on an infinite whiteboard for notes, highlights, and diagrams while reading.

Desktopunknown

Libritus is a desktop research app that renders PDFs on an infinite, pannable canvas instead of a vertical scroll, so highlights, notes, freehand drawings, and web searches can live on the same scene as the text. Selecting text creates a highlight that a note or web search can grow from, and AI is available on demand rather than auto-summarizing. It's aimed at students, researchers, and readers who want to keep their thinking alongside the document.

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