Show HN: Penmentor – Claude marks up your handwritten math like a teacher (github.com)

Penmentor, a new AI tool, introduces a revolutionary way for students to receive real-time feedback on handwritten math work. By integrating with platforms like Claude, GPT, and Gemini, this tool allows users to work in xournal++ and get teacher-like assistance with a single keystroke. It highlights mistakes, marks correct answers, and offers nudges—rather than direct answers—to promote deeper understanding. Additionally, it utilizes 3Blue1Brown-style animations to visually explain concepts, enhancing the learning process. This innovation is significant for the AI and machine learning community as it bridges the gap between traditional learning methods and modern technology. By emphasizing hints and contextual support rather than outright answers, Penmentor fosters a more interactive and engaging learning environment. It runs on familiar command-line agents and is designed for a seamless user experience, making it accessible for students and educators alike. With features like whole page awareness and interactive animations, Penmentor not only aids in math education but also exemplifies the potential of AI to enhance tutoring and knowledge retention.