Open-Source AI Whiteboard PenEcho: Real-Time Interaction for Handwritten Formulas
Scobleizer · x · 2026-07-19
A Reddit user has developed an open-source whiteboard app called PenEcho. It allows users to handwrite math formulas, physics equations, or draw sketches on a canvas, with an AI model providing real-time feedback and answers right next to the handwriting.
- Core Features: Offers a seamless 20000 x 20000 pixel canvas, loading only areas with handwriting to save resources; supports local execution and is compatible with models like Claude, OpenAI, and Codex.
- Technical Highlights: The model can not only recognize handwritten text but also understand the spatial relationships of incomplete equations and sketches, inferring the user's true intent.
- Developer's Perspective: This interactive experience, combining handwriting with spatial reasoning, was technically impossible just six months ago and represents a new paradigm for future scientific research and thinking workflows.
Related event: Open-Source AI Whiteboard PenEcho Enables Real-Time Handwriting Interaction(2 posts)→
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