Hello! We’re Sid, Alex, Ketan, and Milan. We’re building Whiteboard, an open-source desktop app where humans and agents can architect software together in a common workspace. We were missing the feeling of a “whiteboard session” with another dev where you leave with a deep understanding of a system, so we built this app for ourselves.

Whiteboard plugs into the tools you already use - e.g. Claude Code, Codex, etc. – and gives your agent an SDK to draw on an in-app canvas to describe its work. Built on top of CodeOSS, when you click on visualizations like a sequence diagram, an entity relationship diagram, or a quote from the agent’s trace, you can jump to the underlying code directly. We also wrote a semantic, AST-aware diff viewer in Rust so you can only view the code changes which are relevant to you.

Folks at companies like Salesforce and Modal are using Whiteboard today as a review tool for architecture or spec-level changes. Why we built this: we’re four buddies from college who quit our jobs as tech leads right before agentic coding became industry standard. As more PRs were merged without our understanding, we felt a ‘cognitive debt’ begin to seep in.

We’re releasing our desktop app under an MIT license. Eventually we’ll charge companies for a hosted web version that manages whiteboard session creation alongside features like trajectory storage and multiplayer reviews. Everything will always remain self-hostable.