Why Patter uses Apple's on-device AI

There’s an AI feature in Patter now. You can hand the app a webpage, a PDF, a screenshot, a Note, a photo of a list scribbled on the back of an envelope, and it will turn it into a routine. You preview what it came up with, save it if it’s right, throw it away if it isn’t. From there, it’s a normal Patter routine. Run it, tweak it, watch it shrink.

The interesting part isn’t that it exists. Every app has an AI feature now. The interesting part is which AI.

Patter uses the language model that ships with your iPhone. The one Apple built into the operating system — what they call Apple Intelligence. It runs on your device. The webpage you shared, the photo of your notebook, the half-finished list you pulled out of Notes — none of it goes anywhere. It’s read, structured into steps, and shown to you, all on the same piece of glass you’re holding. Apple doesn’t see it. We don’t see it. There’s no server in the middle, because there’s no server at all.

That matters for two reasons. The obvious one is privacy. Patter has always been an app with no account, no analytics, no cloud — your routines are Markdown files on your device, and that’s the entire system. Bolting on a feature that quietly shipped your private notes off to a data centre to get processed would have undone the whole thing. So we didn’t.

The less obvious reason is that this approach is also just free. The frontier models in the news cost real money to run. Subscriptions exist because the companies running them are spending heavily on compute every time someone asks for something. Apple is doing something different. They’ve decided the device in your pocket is fast enough to do a lot of useful work on its own, and they’ve made that capability available to apps like Patter at no cost — no API key, no per-request billing, no token meter ticking in the background. So we don’t have to charge you for it, and we don’t.

Patter is a one-time purchase. It was a one-time purchase before the AI feature, and it’s still a one-time purchase now. There’s no Patter AI tier. There’s no monthly fee for the routine generator. There’s no upsell screen the first time you tap it. The feature is included, because the cost of running it is, for us, effectively zero. Apple is absorbing that on the hardware side, and we’re glad to take them up on it.

What you give up is real, and worth saying. The on-device model is not as clever as the largest frontier ones. It can fumble. It can miss a step, misread a fork in a process, get the order slightly wrong. That’s why the feature shows you a preview before anything is saved. You read what it came up with, you fix what’s wrong, and you decide whether to keep it.

But the bigger reason to spend a minute or two on that preview has nothing to do with the model’s mistakes. It’s that a routine someone else wrote — a template, a generated draft, anything you didn’t think through yourself — will never work as well as one you built. It might look more structured. The grammar might be tidier. The steps might be in a more sensible order than you’d have come up with on your own. None of that matters. Routines are personal. The order that works for you isn’t the order that works in general, and the steps you need reminding of aren’t the steps a stranger needs reminding of. One size fits all does not apply here, and shouldn’t.

So the AI feature, and Patter’s built-in templates for that matter, are not there to do the thinking for you. They’re there to get you off a blank screen. To trigger the “oh, I could use a routine for this” moment. The draft they hand you is a starting point. The work — the part that makes it actually shrink over time, the part that makes the steps eventually disappear because they’ve stuck — that part only happens if you make the routine yours.

The tradeoff sits well with us. A model that runs locally, costs nothing to use, sees nothing it shouldn’t, and produces something you’d have edited regardless. That’s the deal.

So: no subscription, no cloud, no account, no telemetry, no usage limits. You point Patter at something, it gives you a routine to look at, you save it or you don’t. Then the app gets out of the way.

That’s the whole feature. It’s not much. It isn’t supposed to be.