Tools & FrameworksFeatured5 min read
AI Tools
This open-source canvas fixes the one thing chat AI still gets wrong about your sketches
PenEcho is an open-source shared canvas where handwriting, equations, and diagrams become part of an AI conversation. It supports Claude Code, OpenAI Codex, and API-based models, runs locally, and adds a spatial layer to AI interaction that chat windows cannot replicate.
2026-07-27