Grammarly vs ProWritingAid: Our Verdict
One is the everywhere-you-type polish layer. The other is a manuscript-level editor with 25+ style reports. We tested both to decide which one working writers should actually pay for in 2026.
We recommend Grammarly. It wins on cross-app reach, a faster real-time engine, and a free tier that covers most day-to-day writing on its own. ProWritingAid is the right pick for one specific reader: the long-form or fiction writer who lives in a manuscript file and wants the structural reports Grammarly doesn't offer.
These two tools are the default choices in AI writing assistance, and in 2026 they're still solving different problems. Grammarly is a polish layer that follows you across the browser and desktop apps, catching errors as you type and now bundling generative rewrites, tone shifts, and email replies into a single Pro plan. ProWritingAid is a deep editor: you paste (or open) a long document and it returns more than twenty reports on pacing, dialogue tags, sentence variation, overused words, and clichés, plus a native Scrivener integration Grammarly doesn't match.
Both restructured their pricing over the last year. Grammarly renamed Premium to Pro and folded the old Business plan into it, keeping the $12/month annual price. ProWritingAid raised its annual Premium plan from $79 to $120 and added a Premium Pro tier at $144/year with more generous AI limits. We ran both through the same testing and judged them round by round. Each round names a winner and states the concrete method we used to decide it.
Grammarly's real-time engine is still the most refined in the category. On our 50-error test it caught 44 to ProWritingAid's 41, with 3 false positives against ProWritingAid's 5, and its suggestions surface faster with clearer inline explanations. ProWritingAid's grammar checking is competent but visibly slower live, and its calls on contextual errors are occasionally off.
How we tested itWe ran the same 1,000-word document with 50 seeded errors (grammar, spelling, punctuation, and contextual usage) through both tools in the browser extension, and counted true catches, false positives, and how quickly suggestions surfaced as we typed.
ProWritingAid produces more than twenty writing reports covering readability, pacing, sentence variety, overused words, clichés, passive voice, emotional tone, and dialogue quality. That's structural feedback Grammarly doesn't attempt. On a long draft, ProWritingAid's Pacing report will name the specific chapters that drag; Grammarly's clarity suggestions flatten toward a corporate-neutral register and stop at the sentence.
How we tested itWe ran a 3,000-word blog post and a 7,000-word long-form draft through each tool's editor and counted actionable style suggestions beyond basic grammar — pacing, sentence variation, overused words, cliché flags, and dialogue tags — then checked whether each surfaced patterns a line-level checker would miss.
Grammarly runs across more than 500,000 apps and websites, the widest surface of any writing assistant we tested, including Gmail, Google Docs, Microsoft 365, Slack, LinkedIn, and a mobile keyboard. ProWritingAid integrates with Word, Chrome, Google Docs, and Scrivener. The Scrivener plug-in is genuinely unmatched, but outside the manuscript file its coverage is narrower and the mobile experience is thinner.
How we tested itWe installed both extensions and desktop apps and noted where each tool's full feature set was available — browser (Gmail, Google Docs, LinkedIn, Slack), Microsoft Word, macOS/Windows desktop, mobile keyboard, and Scrivener — using each tool's official integrations list.
Grammarly's assistant (formerly GrammarlyGO, now under the Superhuman Go umbrella) works inside the extension across every app it supports, with 100 prompts/month on Free and 2,000/month on Pro. ProWritingAid's Sparks are capped at 3/day on Premium and 50/day on Premium Pro. For everyday rewriting and email drafting, Grammarly's assistant is both more accessible and more generous. ProWritingAid's fiction-specific Critique feature is better for chapter-level feedback, but that's a narrower use case.
How we tested itWe used each tool's generative feature on the same set of tasks — rewrite a paragraph in three tones, draft an email reply, summarize a document, and expand a rough note — and compared prompt limits, response quality, and where the assistant was available.
Grammarly's free plan has no word limit, covers grammar, spelling, and tone, and includes 100 AI prompts a month. ProWritingAid's free plan caps checks at 500 words, which is fine for testing and unworkable for anything longer than a short email. If you never upgrade, Grammarly gives you more of the tool for free.
How we tested itWe used only the free plan of each tool for a week on the same mix of emails, short blog posts, and a manuscript chapter, and recorded the caps that blocked real work.
This is the round that justifies ProWritingAid's existence. Its native Scrivener integration keeps the writer inside the manuscript file; Grammarly's workaround is to compile out to Word or Google Docs and check there. The Pacing, Dialogue Tags, and Sentence Variation reports surface structural patterns across a novel that Grammarly can't see. For fiction writers and anyone editing at manuscript scale, ProWritingAid is the tool.
How we tested itWe loaded a 42,000-word draft manuscript into each tool, opened it in Scrivener where supported, and ran the full report suite — pacing, dialogue tags, sentence variation, cliché check — measuring what actionable structural feedback each produced.
Grammarly Pro is $12/month billed annually ($144/year); ProWritingAid Premium is $10/month billed annually ($120/year), a $24/year saving. ProWritingAid also sells a one-time Premium lifetime license at $399 that breaks even against the annual plan at roughly 3.3 years and saves an estimated $201 over five years. Grammarly doesn't offer that option. For a reader committing to a writing tool long-term, ProWritingAid is the cheaper bill.
How we tested itWe priced a year of each tool on the plan a working writer would actually buy, then priced three- and five-year totals to account for ProWritingAid's lifetime option.
Where the verdict turned
Grammarly took five of seven rounds and takes the recommendation. The reason isn’t that its style analysis is deeper. It plainly isn’t. It’s that a writing assistant is only as useful as it is present. Grammarly works across more than 500,000 apps and websites, more than any other AI writing partner , and for most working readers the writing that actually needs help is the email in Gmail, the doc in Google Docs, and the LinkedIn post being cleaned up before publishing. Grammarly is in every one of those surfaces. ProWritingAid is in fewer of them, and its real-time engine is a step slower.
On the two rounds ProWritingAid won, it won decisively. Its defining feature is the 20+ writing reports that analyze every dimension of your writing: readability, pacing, sentence variety, overused words, clichés, passive voice, emotional tone, dialogue quality, and more. Grammarly doesn’t attempt structural analysis of that kind. And for anyone drafting in Scrivener, ProWritingAid has a native Scrivener integration; Grammarly does not. Those two facts alone are the entire case for ProWritingAid, and for the reader they describe, it’s enough.
What the 2026 restructuring changed
Anyone choosing between these two today is choosing across a pricing shift on both sides. Grammarly changed its pricing from “Premium” to “Pro.” Grammarly Business plan is not available. It has been replaced with a custom-priced Enterprise plan. The individual price didn’t move: Grammarly costs $12/month for Pro on annual billing, or $30/month billed monthly. The Free plan is $0, and Enterprise is custom-priced for larger organizations. There’s also a quarterly Pro option at about $20/month. The Pro plan absorbs what used to be Business, and it folded Premium and Business into one Pro plan that covers both individuals and teams up to 149 members.
ProWritingAid moved more. ProWritingAid restructured its pricing significantly in 2026. The old $79/year plan is gone, Premium now costs $120/year ($10/month billed annually) or $30/month. A new Premium Pro tier adds AI and in-person coaching features at $144/year. The gap on annual billing narrowed, but ProWritingAid is still the cheaper subscription: ProWritingAid Premium costs $120/year versus Grammarly Premium at $144/year, saving you $24/year. However, the gap narrowed: it was $65/year when ProWritingAid cost $79/year. The bigger pricing story is the lifetime license Grammarly has never matched. At $399, the lifetime Premium deal pays for itself in 3.3 years compared to the $120/year annual plan. Over 5 years, you save $201. Over 10 years, you save $801.
AI assistant limits, where each tool caps you
The generative feature is where a heavy user will hit a ceiling. On Grammarly, Free: 100 prompts/month, enough to test the AI, gone in days if you lean on it. Pro: 2,000 prompts/member/month, comfortable for individuals, tight for a team hammering AI rewrites on long-form. Enterprise: Unlimited, the only tier with no cap. No top-ups: Grammarly doesn’t sell overage prompts, so running out means waiting for the monthly reset or upgrading. ProWritingAid rations differently, in daily Sparks rather than a monthly pool: Free: This plan includes basic writing suggestions with a 500-word limit, 10 rephrases per day, and 3 AI Sparks per day (ProWritingAid’s AI feature for idea generation), along with grammar and style checks. Premium: Priced at $10 USD per month when billed annually, this plan offers unlimited word count and rephrases, 5 AI Sparks per day, advanced style improvements, and writing analysis reports. Premium Pro: Priced at $12 USD per month when billed annually, this plan includes all the features of the premium plan, as well as 50 AI Sparks per day.
The practical difference: Grammarly’s assistant is built to be used constantly across every app; ProWritingAid’s is metered as a supplement to the reports.
Who should buy which
Choose Grammarly if writing happens across a lot of surfaces (email, chat, docs, social) and you want one polish layer that catches errors, adjusts tone, and drafts rewrites everywhere you type. The free tier alone covers unlimited-length grammar and spelling on any of those surfaces, and Pro at $12/month adds full-sentence rewrites, plagiarism detection, and a monthly pool of 2,000 AI prompts. Teams get the same tool with admin controls under the same Pro plan. Grammarly is the better choice for professionals, students, and anyone who writes across multiple platforms and needs instant, polished corrections with minimal friction.
Choose ProWritingAid if your writing life centers on a single long document (a novel, a thesis, a long-form article, a book) and you want structural feedback on it, not just line-level fixes. The Scrivener integration is decisive if you already write there; the report suite is the reason to pay for the tool. ProWritingAid is the better choice for authors, novelists, academic writers, and anyone who writes long-form content and wants deep stylistic analysis that helps them improve as a writer. If you plan to keep using it beyond three years, the $399 lifetime license is the rational buy.
For many working writers, the honest answer is both, one for the manuscript file and one for everything else. The workflow that works: ProWritingAid for the manuscript file (Scrivener or Word), Grammarly for everything else (email, social, blog, KDP copy). Toggle one extension off when you’re using the other. But if forced to pick one for the whole writing day, we recommend Grammarly. It’s the tool that will help more of what most readers actually write.