Used Codex to Build a Mac Key Remapper to Solve a Specific Niche Pain Point
aniketapanjwani · x · 2026-08-21
The author faced a niche pain point: the screen drawing app Presentify required a two-handed shortcut (Cmd+Z) to undo, forcing him to put down his stylus. Since the app didn't allow rebinding, he used Codex (OpenAI's coding model) to write a background Mac app in about 2 minutes. This app remaps the single key 'z' to 'Cmd+Z' only when Presentify is active, perfectly solving the single-handed operation need.
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