Show HN: Whiteboard (YC W26) – An open-source IDE for thoughtful software design

Category: devtools

Tags: agent-tools, code-review, diagrams, desktop-app, ide, rust, typescript

Score: 7.0/10 (Innovation: 7, Technical: 8, Documentation: 6, Utility: 7)

Whiteboard is an MIT-licensed desktop IDE that gives coding agents an SDK to draw architecture and design diagrams on a shared canvas, then links those visuals back to the underlying code. It combines a semantic AST-aware diff viewer written in Rust, a decision log for agent traces, and a vendored Code OSS editor, targeting the review bottleneck in agent-generated code.

Target audience: backend and full-stack developers working with AI coding agents, plus tech leads reviewing agent-generated changes

Repository: https://github.com/devdotfast/whiteboard · TypeScript · MIT · 3285 stars

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