Show HN: Penmentor – Claude marks up your handwritten math like a teacher
Penmentor is a new tool that integrates AI models like Claude with handwriting software to provide real-time, teacher-like feedback on math problems. It uses hints and animations to guide students through calculus rather than providing direct answers.
Why it matters
Represents an innovative application of LLMs in personalized education, focusing on pedagogical support rather than simple automation.
A maths mentor at the tip of your pen. Press a key while you work by hand: Claude, Gemini or GPT marks your work on the screen like a teacher with coloured pens, gives you hints instead of answers, and shows the idea as a 3Blue1Brown-style animation.
Handwriting in xournal++ → one key → the slip is marked on the page → box the integral → an interactive manim animation. ( video ; for a repeatable recording the pen is scripted and the model's answer is a fixed example.)
I study calculus with a pen tablet in xournal++. I kept screenshotting my work into Claude and reading long answers back, when what I wanted was a teacher looking over my shoulder: circle the mistake, tick what's right, nudge me toward the next step, and show me why. penmentor is that, one key away, on my own Claude subscription.
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