dev.fast

dev.fast builds Whiteboard, an open-source canvas application that lets developers review code changes with coding agents through visual diagrams and semantic diffs. The tool connects to any MCP-compatible agent, enabling sequence diagrams, database diagrams, and agent trajectory audits directly linked to source code. It runs on macOS, Windows, and Linux with an AST-based diffing engine written in Rust.

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Developer Tools
Artificial Intelligence
Software Only

Updated 8 days ago

Funding

Raised to date

$500KRaised to date based on public sources. This may differ from the amount the company actually raised and is based only on what is publicly available on the internet.

Funding rounds are not available yet.

Founders

Founder details are not available yet.

Product

Problem

Developers reviewing complex code changes or system architecture often rely on static text diffs and fragmented tooling, making it difficult to grasp the structural impact of modifications. Coding agents produce outputs that can be hard to trace back to the source, and existing review workflows lack a shared visual context for discussing design and implementation details.

Solution

Whiteboard is an open-source canvas application that provides a visual workspace for reviewing code with coding agents. It connects to agents via the Model Context Protocol (MCP), allowing any MCP-compatible agent to create whiteboards that illustrate changes, draw sequence and database diagrams, and link each step back to the source code. Developers can select code sections to generate diagrams, expand pseudocode summaries into full source, and copy selections for their agent to act upon. The tool also supports auditing agent trajectories, letting engineers verify that decisions made during an agent run were completed correctly and make sense in context.

Target Audience

Primary users are software engineers and engineering teams at companies using coding agents, particularly those at high-performance organizations that need to review and audit agent-generated code changes at an architectural level.

Features

AST-based diffing engine written in Rust and compiled to WASM, providing structural diffs that show architecture-level changes rather than line-by-line text
MCP integration that works with Claude Code, Codex, Cursor, OpenCode, Pi, oh-my-pi, and Copilot CLI, with setup automated for these agents
Sequence diagrams, database diagrams, and other visual representations of code changes that link each step back to the source
Pseudocode summarization for long algorithms with the ability to expand back to full source, plus extensible plugin support
Agent trajectory review that captures every agent run and allows querying decisions, with storage tied to version control
Cross-platform desktop app for macOS, Windows, and Linux with remote host support for Linux machines accessed over SSH