# Claude Mac App Uses Electron, Developer Implicated > Source: > Published: 2026-07-03 21:56:07+00:00 Tech commentator **John Gruber** argues in a **July 3, 2026** Daring Fireball post that **Felix Rieseberg** - Anthropic's engineering lead for Claude Cowork and Claude Code Desktop, and a co-maintainer of the `Electron` framework - is the reason Claude's Mac app is built with Electron rather than native code. Rieseberg previously led desktop engineering at Notion and Slack, both of which also ship Electron-based Mac apps, and co-authored the O'Reilly book "Introducing Electron." Gruber's critique follows a February 2026 post by Drew Breunig asking why Anthropic doesn't use its own coding agents to build a native Mac app; Anthropic's Boris Cherny responded on Hacker News that engineers who "worked on Electron back in the day" preferred building non-natively for shared code across platforms. Gruber calls this a matter of framework-choice tradeoffs, not a fundamental AI capability gap.