GoKawiilPenmentor uses Claude, Gemini or GPT to mark handwritten calculus work in Xournal++
Penmentor is a tool that integrates with the Xournal++ note-taking app, letting users press a key while writing math by hand so an AI model (Claude, Gemini or GPT) annotates their work on screen with marks resembling a teacher's corrections. Boxing a specific step, like an integral, can trigger an interactive animation built with 3Blue1Brown's manim library to illustrate the concept.