Show HN: ScreenFocus – keyboard focus follows the pointer across Mac displays

A developer used ChatGPT and Codex to build ScreenFocus, a free macOS app that makes keyboard focus follow the pointer across multiple displays while preserving global shortcuts. The app includes features like focus protection, display border styles, launch-at-login, and automatic pausing when only one monitor is connected. It was the developer's first native Mac app, built with GPT-5.6 Sol and released under the MPL 2.0 license.

I have a multi-monitor setup and spend a lot of time typing in Codex and other AI agents. When I move to another monitor to run a shortcut, focus often stays in Codex or another text app, so the shortcut runs in the wrong place. I asked ChatGPT if there was a macOS setting or free app for this. It couldn't find one that did exactly what I wanted, so I asked it to prototype one. It built a working version in one go. I then used Codex to add sensible defaults, focus protection, an optional display border, packaging, documentation, an MPL 2.0 license, a logo, and screenshots. ScreenFocus is the result: keyboard focus follows the pointer across displays while global shortcuts keep working. This was my first native Mac app, and I used GPT-5.6 Sol with High reasoning. If you check out the README, help docs, and other Markdown files, you might be surprised by how complete it feels. I also added Launch at Login, full-border and corner-marker styles, custom colors, automatic pausing when only one monitor is connected, and a few other settings. Comments URL: https://news.ycombinator.com/item?id=49055525 https://news.ycombinator.com/item?id=49055525 Points: 1 Comments: 0