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Phillips JoineryCase study · AI Limits · our own app Four platforms, one reader
AI Limits shows how much of your AI usage window is left and when it resets, on iPhone, Mac, Android and Windows. One piece of code reads the usage and all four apps run that same file. We built it for ourselves, and on 31 October 2026 it went on the App Store.
Nobody knows how much of the window they have left
Everyone who works with AI tools hits the same wall: you are in the middle of something, the limit runs out, and you had no warning. The numbers exist, but they are buried in a settings page you have to go and look at, on each service separately.
We wanted one readout, always visible, showing how much of each window is gone, when it resets, and whether you are burning through it faster than the clock is.
One reader, four native shells
The interesting part is underneath. There is one piece of code that reads the usage, and all four apps run exactly that same file: the iPhone app, the Mac app, the Android app and the Windows app. Signing in happens inside each app, on the service’s own page, so credentials never pass through anything of ours.
Everything above that reader is native to its platform: a widget and menu bar readout on the Mac, home and lock screen widgets on iPhone, the notification area on Windows. The builds check themselves against the shared reader, so the four apps cannot quietly drift apart.
The tools we sell have to be tools we use
We run AI through the work here every day, which is exactly the kind of problem worth solving for yourself first. It is also the honest way to learn a platform: four app stores, four sets of rules, four signing processes and four sets of rejections teach you more than reading the documentation.
It went on the App Store on 31 October 2026, version 1.0.0, at £1.99. The Mac, Android and Windows builds are finished and not published yet.
How it was built
Shared reader first, then a native app per platform.
- FirstThe reader
One file that reads usage, tested on its own.
- ThenMac
Desktop widget, menu bar readout, five themes.
- TheniPhone
Home screen and lock screen widgets.
- ThenAndroid
The same reader in a native Android app.
- 31 October 2026On the App Store
Version 1.0.0 published, with the other three builds behind it.
The work, in the open
Why there are no user numbers
AI Limits went on the App Store on 31 October 2026, so any number we printed today would be a day old and meaningless. What this page is evidence of is the engineering: the same usage reader running inside four separate native apps, built here, without the credentials ever touching anything of ours.
Built for ourselves, then sold
AI Limits is on the App Store now. It started as a thing we needed in the studio, which is the honest reason most good software exists.
If you want a widget, a utility or an app on several platforms at once, that is the work on this page.
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Can you build the same app for iPhone, Android, Mac and Windows?
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