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

Whiteboard is an open-source IDE developed by a team of four former tech leads, designed to facilitate collaborative software design between humans and AI agents. It integrates with existing tools like Claude Code and Codex, allowing agents to visualize their work on an in-app canvas and connect diagrams to code. The app includes features such as a semantic diff viewer and decision log to enhance code review and understanding of AI-generated decisions.

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PublishedSeptember 24, 2026sidharthkmenon
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WHY IT MAY MATTER

Whiteboard helps developers and AI agents collaborate more effectively by providing a shared workspace for designing software, integrating with existing tools, and offering features like semantic diffs and decision logs to improve code review and understanding.

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