Whiteboard (YC W26) launches open-source desktop IDE for AI-assisted software design

Introduction to Whiteboard

Whiteboard is a new open-source desktop application designed to facilitate collaborative software architecture. It allows human developers and AI agents to work together within a shared workspace, aiming to bridge the gap between design and implementation.

AI Agent Integration and Functionality

The application connects with existing AI coding agents such as Claude Code and Codex. It provides an SDK that enables these agents to draw directly on an in-app canvas, visually describing their work and proposed solutions. This feature is intended to make AI contributions more understandable and actionable for human developers.

Workflow and Usage

Users can download Whiteboard, connect their preferred coding agent, and then instruct the agent to review code branches or explain complex changes. The platform is noted to work effectively with models like GPT-6 Sol and Claude Opus 5.5. Example prompts demonstrate how agents can propose APIs, provide examples, and explain motivations for code changes, with the ability to jump from visualizations to underlying code.

Developer Tools and Features

Whiteboard includes a semantic, AST-aware diff viewer written in Rust, which filters out noise from raw diffs by summarizing large functions and collapsing unit tests or documentation changes. The application also offers VSCode keybindings and LSP support, enhancing the code navigation experience. These features are designed to provide a more focused and efficient development environment.