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WriteAmp Can Run on Apple's Model. Here's the Trade.

Here is something that surprises people, including people who use the app every day: WriteAmp doesn't have to use its own model. On macOS 26, it can route its suggestions through Apple's on-device model instead, the same engine behind Apple Intelligence, and the whole Tab-to-accept habit works exactly the same. You wouldn't notice the difference from the interface, because the interface doesn't change.

What changes is underneath, and there's a real trade in that choice. I want to lay it out honestly, because "WriteAmp runs on Apple's model" sounds like a magic bullet, and it's not. It is a choice with real trade-offs, and you should make it with your eyes open.

The two engines

Let me set up the choice clearly. WriteAmp normally uses its own local model, the one it downloads to your Mac, the one with the tiers I wrote about in the engines post. That model is small, fast, and tuned for the job. The alternative, on macOS 26, is to let WriteAmp ask Apple's on-device model to do the completing instead, the same way Apple Intelligence does it in Apple's own apps.

Both are on-device, which is the foundation, and I want to say that first because it's the part people worry about. Whether the engine under the hood is mine or Apple's, your writing stays on your Mac. I published the full network ledger and the answer doesn't change with the engine: the words stay home.

What you give up

Here is the honest trade, and it has three parts. The first is speed. Apple's model is more capable in the abstract, but it's a bigger engine with a different latency profile, and for the specific job of finishing the next few words, the smaller tuned model is faster. I wrote about the line between fast enough and in the way in another post, and that line is exactly where this trade lives. A suggestion that arrives a little slower is a suggestion that's more likely to land after you've moved on.

The second thing you give up is personalization. Apple's model doesn't read your writing history. WriteAmp's own model does, when you've it enabled, which is what makes suggestions sound like you instead of like a stranger. If you route through Apple's model, the suggestions are generic, correct but not yours. I wrote about how the learning works and the whole value of it disappears when the engine doesn't see your history.

What you gain

The trade has a real upside, and it's why the option exists. You don't have to download a model at all. WriteAmp's own engine is a download, a few hundred megabytes depending on the tier, and some people don't want that on their disk or don't want to wait for it. The Apple path means the app can work on a fresh Mac with zero model download, using the engine that's already there.

And there's a third thing, the one that matters for the trial. Apple Intelligence mode stays free even after the trial ends. The local model is what the license gates, and the Apple path isn't gated the same way. I wrote about the trial and pricing in another post, and the Apple mode is the reason there's always a working path to suggestions, even before you buy, even after a trial expires. That is deliberate. I want there to always be a way to use the Tab habit, even if you've not paid yet.

Which one should you pick

Here is the honest decision guide, and it's simpler than people expect. If you want the fastest, most personal suggestions and you're fine with a one-time model download, use WriteAmp's own engine. If you're on a fresh Mac, don't want the download, or just want to try the habit before committing, start on the Apple path. You can switch any time, in settings, and the habit doesn't change, because the interface never changes. I wrote about choosing between the engines in another post if you want the fuller decision framework.

The suggestion above looks identical no matter which engine produced it, which is the whole point. The engine is plumbing, and the habit is the product. The trial is free for 30 days if you want to try both and feel the difference in your own typing, and the engines post has the details on the local tiers. The trade is real, and now you've the whole table, so you can make it honestly.

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On macOS 26+ Macs, Apple Intelligence mode stays free even after the trial ends — you always keep a working path to suggestions.

Written by Amit Ashwini, who builds WriteAmp and runs its marketing. More: why the Tab key beats the chat box · mini, midi, and max compared · benchmark methodology.