Penmentor

Tool Oct 21, 2026

A Linux handwriting companion that asks Claude Code, Codex or Antigravity to annotate mathematics on screen and generate interactive explanations.

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Penmentor's scripted xournal++ demo overlays green ticks, a sign correction and an integration-by-parts explanation on handwritten calculus. — Frame from the author's scripted demo with a fixed model response. It illustrates colored marks over handwritten work, not a live AITrending test of recognition or mathematical accuracy. Source: Abdullah Alhariri / Penmentor, MIT repository demo

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Ecosystem Oct 21, 2026

$Penmentor's scripted xournal++ demo overlays green ticks, a sign correction and an integration-by-parts explanation on handwritten calculus.$

Penmentor turns your coding-agent subscription into a handwritten math tutor

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Penmentor is an MIT-licensed application for handwriting mathematics in xournal++ on Linux X11, tailored to a pen tablet and the i3 window manager. Its author describes colored feedback, a ladder of hints and interactive manim explanations. It uses an installed, authenticated command-line agent rather than supplying a model or a general provider API connection.

The guide says screenshots of every monitor, together with the current xournal++ page when its plugin is installed, go to the selected model through Claude Code, Codex or Antigravity. The published demo uses scripted handwriting and a fixed model response. It illustrates the interface rather than establishing live tutoring accuracy.