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Whiteboard (YC W26) launches open-source IDE for human-AI software architecture

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A four-person team of former tech leads has released Whiteboard, an open-source desktop IDE designed to help developers and AI agents collaboratively design and review software. Built on top of CodeOSS, the app lets AI agents draw diagrams and traces on an in-canvas workspace, with direct links to the underlying code. Key features include a Rust-based semantic diff viewer, a decision log for tracking autonomous agent choices, and compatibility with tools like Claude Code and Codex. The app is already being used by engineers at companies such as Salesforce and Modal for reviewing architecture and spec-level changes. Released under an MIT license, the team plans to eventually offer a hosted web version with multiplayer reviews and trajectory storage while keeping the tool self-hostable.

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