Grammarly vs ProWritingAid: Which Writing Assistant is Better in 2026?
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Grammarly vs ProWritingAid: Which Writing Assistant is Better in 2026?
Grammarly and ProWritingAid are the two names that come up every single time someone asks about a writing assistant. Both catch your typos. Both fix your commas. Both promise to Make you sound smarter in emails.
Then they go in completely different directions.
I've used both for years — Grammarly for client emails and blog drafts, ProWritingAid for a 90,000-word novel manuscript that needed more help than I care to admit. They're both good. They're also built for different people, and picking the wrong one means paying for features you'll never touch.
So let's settle this properly. Here's what actually separates them in 2026, where each one wins, and which one you should hand your money to.
The short answer, if you're in a hurry
- Pick Grammarly if you write across lots of apps and platforms — email, Slack, LinkedIn, Google Docs, Word — and you want suggestions that are usually right without much fiddling.
- Pick ProWritingAid if you write long-form content: novels, essays, newsletters, book-length nonfiction. Its report system gives you a level of detail Grammarly simply doesn't attempt.
- If you write fiction or you're self-publishing, ProWritingAid is the better tool and it isn't close.
- If you're a freelancer or small business owner who mostly needs clean, professional copy fast, Grammarly is easier to live with day to day.
Now the details.
What each tool actually is
Grammarly started as a browser extension that underlined your mistakes. It's now a full writing platform. The company acquired Coda in late 2024 and Superhuman in 2025, and the product has expanded into docs, email assistance, and AI generation. Roughly 30 million people use it daily, and it works inside more than 500,000 apps and websites through its extension and desktop clients.
The core pitch hasn't changed though: it reads what you're writing and suggests corrections in real time, ranked by how confident it is that you should accept them.
ProWritingAid is a British company founded in 2013, and it took a different route. Instead of nudging you sentence by sentence, it runs your document through a set of analytical reports — 20-plus of them — and hands you a breakdown. Pacing. Sentence length variation. Overused words. Sticky sentences. Clichés. Dialogue tags. Echoes. It's less "fix this comma" and more "here's why chapter four drags."
That difference sounds small. In practice, it shapes everything about how the two tools feel.
Grammar and correctness: closer than you'd think
Both catch the obvious stuff. Subject-verb agreement, missing apostrophes, their/there/they're, doubled words. Neither one embarrasses itself here.
The gap shows up in edge cases and in how they handle your intent.
Grammarly is more confident. It flags fewer things, and when it flags something, it's usually right. That restraint is a feature — you don't spend your afternoon dismissing false positives. It also has strong tone detection, so it'll warn you when an email reads as curt or aggressive before you hit send.
ProWritingAid casts a wider net. It catches things Grammarly lets through, particularly around passive voice, adverb overuse, and sentence construction. It also produces more noise. You'll dismiss suggestions that are technically correct but stylistically wrong for what you're doing. If you're the kind of writer who wants to see every possible issue and decide for yourself, that's a plus. If you want to write and move on, it's friction.
For straight grammar checking on a business email? Grammarly wins on speed and signal-to-noise.
For a manuscript you're about to send to an editor? ProWritingAid's extra flags are worth the noise.
Style and reports: where ProWritingAid pulls ahead
This is ProWritingAid's home turf, and it's worth understanding what you actually get.
The Style report looks at readability, sentence length distribution, and how your writing flows. The Pacing report shows you where your prose speeds up and where it stalls — genuinely useful for fiction. The Echoes report finds words you've repeated within close proximity. The Sticky Sentences report flags sentences padded with glue words (of, the, in, to) that could be tightened. The Dialogue report analyzes your dialogue tags and how often you're using "said."
Grammarly has style suggestions too — clarity, conciseness, engagement, delivery. They're good. But they come at you one at a time as you type, and there's no way to look at your document as a whole and see patterns across 80,000 words.
That's the real distinction. Grammarly edits sentences. ProWritingAid edits documents.
If you're writing a 600-word blog post, sentence-level editing is all you need. If you're writing something with structure — chapters, arguments, a narrative arc — you need the document view, and ProWritingAid is the only one of the two that gives it to you.
AI features in 2026
Both tools have leaned hard into AI, and both have been a bit clumsy about it.
Grammarly's AI is woven into the writing surface. You can highlight a sentence and ask it to rewrite, shorten, change the tone, or generate a reply to an email. The free plan gives you 100 AI prompts a month, which sounds generous until you burn through it in a week. Paid plans lift that limit substantially. The generative output is decent — not as good as a dedicated model like Claude or ChatGPT for long-form drafting, but it's right there in the app, which matters more than people admit.
ProWritingAid's AI is more of a helper bolted onto the reports. You can ask it to rephrase a flagged sentence or explain why something was flagged. It's useful in context but less ambitious. ProWritingAid has also added AI detection-adjacent features and expanded its "everywhere" integrations, but generative writing isn't the product's center of gravity.
If you want an AI co-writer, Grammarly is the better bet. If you want an AI editor, ProWritingAid is.
Plagiarism checking
Both offer it, both put it behind a paywall, and both are fine for basic use.
Grammarly's plagiarism checker compares your text against around 16 billion web pages plus ProQuest academic databases. ProWritingAid checks against billions of pages too, with academic sources included in its upper tiers.
Neither is a substitute for Turnitin if you're in academia. For a blogger or content marketer checking whether a freelancer lifted a paragraph, either one does the job. Grammarly's database is slightly deeper on the academic side.
Where you can actually use them
This is where a lot of reviews get vague, so let's be specific.
| Platform | Grammarly | ProWritingAid |
|---|---|---|
| Chrome / Edge / Safari / Firefox | Yes | Yes |
| Microsoft Word | Yes (add-in) | Yes (add-in) |
| Google Docs | Yes | Yes |
| Scrivener | No | Yes (native integration) |
| Desktop app (Mac/Windows) | Yes | No (browser only) |
| Mobile Keyboard (iOS/Android) | Yes | Limited |
| Email clients (Gmail, Outlook) | Yes | Yes (via browser) |
| Slack, LinkedIn, social | Yes | Partial |
| Works offline | Limited | No |
Grammarly's desktop app and mobile Keyboard are the difference makers here. Being able to correct a text message or a Slack message on your phone is genuinely handy, and ProWritingAid doesn't really compete there. It's built for people sitting at a Desk working on a document.
ProWritingAid's Scrivener integration is a big deal for novelists — Scrivener is the go-to writing software for fiction, and having your editor live inside it saves a lot of copy-pasting.
Pricing comparison
Prices shift, but here's where things stand as of early 2026.
| Plan | Grammarly | ProWritingAid |
|---|---|---|
| Free tier | $0 — basic grammar, tone, 100 AI prompts/mo | $0 — 500-word limit per check, limited reports |
| Monthly | $30/month | $30/month |
| Annual (billed yearly) | $12/month ($144/yr) | $10/month ($120/yr) |
| Upper tier | Business: $15/seat/month annually | Premium Pro: $12/month annually ($144/yr) |
| Lifetime license | Not offered | $399 (Premium) / $499 (Premium Pro |
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