Hi Product Hunt! I’m Khang, and I built Math Notebook. As a math lover, I’ve always preferred working out problems by hand. When I transitioned to digital note-taking, my setup was surprisingly primitive: I was literally using MS Paint and a mouse to scribble out equations. While it got the job done, it was painfully obvious that standard drawing tools aren't built for the complexities of mathematics. I wanted an infinite digital workspace specialized entirely for math—a place where raw handwriting meets actual computational power. So, I built it myself. The Development Process & Tech Stack: To make the app truly recognize math, I didn't just want to rely on generic APIs. I trained my own custom machine learning model to handle the handwriting recognition (OCR) specifically for mathematical symbols. Once the handwriting is digitized, I wired the core architecture together using some of the best computational packages available: SymPy (Python CAS): Acts as the brain on the backend, handling the heavy symbolic computation, solving complex inequalities, and finding domain boundaries. Mafs (React/WebGL): Powers the interactive, beautifully shaded graphs directly on the infinite canvas. KaTeX: Ensures all the digitized math and solutions are formatted flawlessly. The Result: An infinite whiteboard where you can scribble an equation, instantly digitize it via the custom OCR model, and generate interactive WebGL graphs and solutions without ever typing a single line of LaTeX. It is completely free to use directly in your browser. I’d love for you to try it out, throw your hardest problems at it, and let me know what you think. I'll be hanging out in the comments all day to answer your questions, talk architecture, and hear your feedback!

Math Notebook

Handwrite math. Get instant solutions & graphs.

Handwrite math. Get instant solutions & graphs.