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WriteAmp vs Grammarly: The Honest Version

Let me start with the part that'd surprise no one who's read this blog: I don't think WriteAmp and Grammarly are actually rivals. They get compared because they're both software that touches your writing, but they do different jobs, for different reasons, and the honest version of this post is mostly about helping you figure out which job you actually need done.

I'm going to tell you where Grammarly wins, because it wins real things, and then I'll tell you where the two tools genuinely differ, and then you can decide.

What Grammarly is genuinely good at

Grammarly is a grammar and clarity checker, and it's the best-known one for a reason. It reads your whole sentence and catches the things that are actually wrong: the subject-verb disagreement, the comma splice, the word that doesn't mean what you think it means. It explains its suggestions, which is how you learn. It has a real editor-side experience in the browser. For a certain kind of writing, the kind where correctness matters and you want a second pair of eyes, it's a good tool, and I'm not going to pretend otherwise. The older post on this blog, the honest roundup of writing tools, already conceded this, and I still stand by it.

WriteAmp isn't that. WriteAmp won't tell you that you split an infinitive, because WriteAmp doesn't check grammar. It finishes sentences. You type "thanks for the", it offers "quick turnaround", you press Tab. That's the whole job, and it's a different job from catching your mistakes.

Where they genuinely differ

The real difference isn't features. It's the answer to a question most people never ask: where does the sentence you type actually go?

Grammarly is a cloud tool. To check your grammar, your text has to travel to Grammarly's servers, where it's processed and, depending on the plan and the terms, stored. That's not a knock on Grammarly. It's the architecture that makes deep grammar checking possible, because the models that do that well are too big to run on a laptop. If you want the grammar checking, the cloud is the price of admission, and for many people it's a fair price.

WriteAmp is the opposite. The model that finishes your sentences is small enough to live on your Mac, so nothing you type ever leaves it. That's not a moral victory, it's just what becomes possible when the job is narrow. Finishing the next few words is a small enough task that a small local model can do it, and a small local model has no reason to send your writing anywhere. I wrote about the structural argument in another post, and it applies here directly: a tool that never receives your words can't leak them, sell them, or train on them.

So the real question isn't "which is better." It's "what are you willing to trade?" Grammarly trades your drafts traveling to a server in exchange for deep grammar checking. WriteAmp keeps your drafts on your Mac in exchange for not checking your grammar.

The honest recommendation

Here's the version I'd give a friend, and I've given it to several.

If you're writing under client confidentiality, the calculus shifts hard toward the local option, because your NDA doesn't bind a server you don't control. If you're writing marketing copy where a misplaced comma is a small scandal, the calculus shifts toward Grammarly.

The honest close

I'm not going to tell you Grammarly is bad, because it isn't, and a blog post that pretends my tool beats it at its own job would be lying to you. WriteAmp doesn't check grammar. If that's the job you need done, go get Grammarly or something like it, and I mean that sincerely.

What WriteAmp does is different and, for the people who type all day, quietly more valuable: it makes the mechanical part of writing disappear, so the part that's actually you has your full attention. If that sounds like the job you need done, the trial is free for 30 days, and the privacy page covers what stays on your Mac while you find out. The two tools aren't rivals. They're two different jobs, and now you know which one you were hiring for.

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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.