I've been vibe coding SwiftUI menu bar apps for my new Mac, turns out Claude Opus 4.6 and GPT-5.4 are both competent at Swift programming, no need to even open Xcode! https://simonwillison.net/2026/Mar/27/vibe-coding-swiftui/
Vibe coding SwiftUI apps is a lot of fun

I have a new laptop—a 128GB M5 MacBook Pro, which early impressions show to be very capable for running good local LLMs. I got frustrated with Activity Monitor and decided …

Simon Willison’s Weblog

@simon I have been writing iPhone apps this way too. I have 5 now, but haven't paid the Apple tax, so I can run them on real hardware.

My first two are in Flutter, then I decided to have Claude port them to Swift and it's been nice.

I have a TV viewer app so I can use a FireTV, both audio and video, on my Mac and it nailed it.

@webology @simon does this mean, if I write my own app and want to put it on my own phone I have to pay apple?