ProWritingAid vs Grammarly for Novelists and Long Manuscripts
For novels and book-length nonfiction, ProWritingAid is the better pick in the prowritingaid vs grammarly decision. It's built around reports on whole manuscripts, it has a Scrivener integration, and it sells a lifetime licence. Grammarly is better suited to checking as you type across email, browsers and everything else you write in.
Choose ProWritingAid if you're self-editing a full draft and want pacing, repetition and story-level feedback. Choose Grammarly if most of your writing is short (emails, blog posts, newsletters, social posts) and you want one checker that follows you everywhere. You can also pair Grammarly's free plan for day-to-day writing with ProWritingAid for the manuscript.
One caveat up front: this comparison is based on official documentation, pricing pages and published reviews, not on running a manuscript through both tools. Where sources disagree, I say so.
At a glance
| ProWritingAid | Grammarly | |
|---|---|---|
| Best for | Novels, long-form, self-editing | Everyday writing in any app |
| Paid price | from $10/month billed annually, $120/year (as of October 2026) | from $12/month billed annually, $144/year (as of October 2026) |
| Monthly billing | $30/month | $30/month |
| Lifetime option | Yes, $399 (Premium) | No |
| Free plan | Yes, 500 words per check | Yes, with 100 AI prompts a month |
| Whole-manuscript reports | Yes, via paid Story Credits | None listed on its plans page |
| Scrivener | Integration via Desktop Everywhere (Windows, Mac) | Check Grammarly's supported-apps list |
| Mobile apps | Not covered here | iPhone, iPad, Android |
ProWritingAid lists Premium at $10 a month billed annually ($120/year), $30 month to month, or $399 lifetime, with Premium Pro at $12 a month billed annually, $36 monthly or $699 lifetime. Grammarly Pro costs $12 per member per month when you pay $144 up front, or $30 per month if you pay month to month. Prices are in US dollars and can differ by region and currency, so check the live pricing page before you buy.
Manuscript-level feedback
This is the biggest difference, and it's why the angle of this article exists. ProWritingAid offers 25+ specialized reports covering pacing, sentence length variation, repetition, dialogue tags, sticky sentences, overused words and readability. Those are patterns you can't easily see by reading your own pages.
On top of those sits a set of story reports: Manuscript Analysis, Plot Analysis, Character Analysis, Virtual Beta Reader and Marketability Analysis. Manuscript Analysis also gives chapter-specific insights and flags plot holes, inconsistencies and weak world-building. These work best with at least 6,000 words and can analyze up to 300,000 words per run. For smaller chunks, Chapter Critique handles up to 6,000 words at a time.
Here's the catch most buyers miss. None of the subscriptions include the whole-manuscript reports. You pay per run in Story Credits. One reviewer lists a credit at $50 at full price, $35 with Premium and $25 with Premium Pro. Credits are nonrefundable and don't expire. Rerunning a report after every revision adds up, so plan on running them once or twice per draft.
Grammarly doesn't list a comparable story-analysis layer on its plans page. It checks correctness, clarity and tone sentence by sentence, so it won't tell you whether your middle chapters drag.
Winner: ProWritingAid, clearly.
Grammar, style and everyday checking
For plain proofreading, both do the job, and I haven't found an independent accuracy study that settles which one catches more errors. So treat claims of a clear accuracy winner with suspicion.
Grammarly's strength is the surrounding experience: fast real-time suggestions, tone detection and a free plan that covers the basics. A free account covers grammar, spelling and punctuation plus a small allowance of AI prompts. ProWritingAid's strength is depth. It explains and categorises issues more like an editor's checklist than an autocorrect.
If you write dialogue-heavy fiction with fragments and dialect, expect to reject suggestions from either tool. ProWritingAid's customizable style guide helps; Premium includes a custom style guide and unlimited word count.
Winner: Grammarly for quick everyday checks, ProWritingAid for deliberate editing passes. Call it a tie by use case.
Handling long documents
Here the two tools behave differently in practice. Grammarly's web editor checks up to 100,000 characters at a time, while the Windows and Mac apps have no limit beyond your text editor. That web limit works out to roughly 16,000 words, or about 60 pages. A full novel won't fit in the web editor in one go.
Grammarly's support page also lists usage caps: up to 300 documents or 150,000 words in any 30-day period. The same page lists 100 documents or 50,000 words in any 24 hours, so check the current limits before a long project.
ProWritingAid Premium has no word limit, but it isn't frictionless either. Its own help centre recommends splitting your work into chapters so it runs faster and doesn't overwhelm you with suggestions. One review also reports that performance degrades on very long documents, so most authors work chapter by chapter. Either way, you'll want to edit in chapters.
Winner: ProWritingAid, narrowly. Premium has no word limit, while Grammarly's web editor and monthly word cap restrict long projects. Neither tool loves a 120,000-word file.
AI features
Grammarly leans heavily into generative AI. Free gets 100 AI prompts a month; Pro gets 2,000 and adds full-sentence rewrites, tone adjustment, plagiarism checking and AI-text detection. The company also changed its name: Grammarly's parent announced it was becoming Superhuman, uniting Grammarly, Coda and Superhuman Mail. The Grammarly product itself keeps its name.
ProWritingAid keeps its generative AI narrow. Its story reports use large language models to analyse your writing but don't generate suggestions or alter your text. Generative AI appears only in Sparks and Rephrase, and you don't have to use it. Daily limits scale by plan: Premium gets five Sparks a day and Premium Pro gets 50.
One thing authors worry about is AI detectors. ProWritingAid's help centre admits some detectors, such as Turnitin, may flag writing edited with ProWritingAid even if you didn't use generative features. Grammarly Pro adds its own detector and an Authorship feature meant to show how a document was written. If this concerns you, read our guide on how to prove you didn't use AI, and if you want AI to help draft rather than just edit, see the best AI for writing a book.
Winner: ProWritingAid for authors who want AI kept out of their prose; Grammarly if you want more generative tools.
Privacy and your manuscript
Your unpublished book is your livelihood, so this matters. ProWritingAid's position is simple: it says it never uses your work to train its AI models or algorithms. It keeps your text only for the time it takes to process it, then removes any record. The exception is documents you create and store in its Web Editor, which are encrypted and kept in the cloud.
Grammarly's setup depends on your account type. The Product Improvement and Training setting is on by default for individual Free, Premium and single-user Pro accounts, and off by default for Education and Enterprise accounts. You can switch it off in your settings. Grammarly also says it doesn't allow its LLM providers to train models on user content.
If you use Grammarly on a manuscript, open the privacy settings first and decide what you're comfortable with.
Winner: ProWritingAid, because the default is the safer one.
Integrations and where you write
Grammarly's reach is its strength. It works in a wide range of apps and websites, including Gmail, Outlook, Google Docs and Slack. It also covers Windows, Mac, major browsers, iPhone, iPad and Android. Check Grammarly's supported-apps list before relying on it inside Scrivener or Word.
ProWritingAid is narrower but more writer-focused. It runs as Mac and Windows desktop apps and integrates with Word, Google Docs, Scrivener and Apple Pages, plus Chrome, Firefox and Edge extensions. Its Word add-in is Windows only. It also runs its story reports inside Scrivener, which is a real advantage if you draft there. If you're unsure about Scrivener, read is Scrivener worth it.
Winner: Grammarly for breadth, ProWritingAid for Scrivener-based novelists.
ProWritingAid vs Grammarly: pricing
Both land at a similar annual price, but they structure it differently.
| Cost over 3 years | Total |
|---|---|
| ProWritingAid Premium, annual ($120/year) | $360 |
| ProWritingAid Premium Lifetime | $399 |
| Grammarly Pro, annual ($144/year) | $432 |
| Story Credits (ProWritingAid, per run, with Premium discount) | extra, about $35 each |
The arithmetic is ours, based on the listed prices above. Lifetime breaks even against the annual plan after roughly three and a third years, so it only pays off if you're staying. Monthly billing is expensive on both: ProWritingAid Premium on monthly billing costs $360 over a year against $120 annually. Grammarly's month-to-month rate is $30, so annual billing is the cheaper route if you will use it for more than a few months.
Refunds are tight at ProWritingAid. Monthly plans aren't refundable, and annual and lifetime plans only within three days. Use the free plan first, though be aware it's capped at 500 words per check with two runs of each report a day, which is closer to a demo than a real trial.
Winner: ProWritingAid on sticker price and the lifetime option, as long as you don't need many Story Credits.
Grammarly vs ProWritingAid vs Ginger
Searchers often add Ginger to this comparison, so a quick note. Ginger is a grammar-checking and rephrasing tool with translation features. It is not positioned around story analysis, so it doesn't compete with ProWritingAid for manuscripts. Prices differ widely between sources, so check Ginger's official site directly. For other options, see our roundup of Grammarly alternatives.
Pros and cons
ProWritingAid
Pros
- 25+ reports built for long-form and fiction
- Whole-manuscript reports covering up to 300,000 words
- Lifetime licence available
- Privacy-first handling and narrow AI use
- Native Scrivener support
Cons
- Story reports cost extra through Story Credits
- Free plan is capped at 500 words per check
- Short refund window, none on monthly plans
- Works best chapter by chapter, and offers fewer app integrations
Choose it if you're self-editing a full manuscript and want story-level, pacing and repetition reports.
Skip it if you mostly write short pieces across many apps, or you don't want to pay extra for Story Credits.
Grammarly
Pros
- Works across a huge range of apps and devices
- Useful free plan
- Fast, polished real-time checking and tone detection
- No manuscript-length reports needed for everyday use
Cons
- No story-level analysis for fiction
- Web editor stops at 100,000 characters
- Training on your content is on by default for individual accounts
- Free plan is limited to 100 AI prompts a month
Choose it if you want one checker that follows you across email, browsers and apps.
Skip it if you need story-level feedback on a novel, or you want training on your content off by default.
Which should you choose?
- Writing and revising a novel: ProWritingAid. Start with Premium, use the included trial credit on a full draft, and judge the reports before buying more.
- Writing nonfiction articles, emails and a blog alongside a book: Grammarly for daily use, perhaps with ProWritingAid for the book itself.
- On a tight budget: use Grammarly Free, and add ProWritingAid annual when the draft is done.
- Staying with one tool for years: ProWritingAid Lifetime is the only option here that stops billing.
Neither replaces a human editor. If you're heading toward publication, see how to self-publish a book and our picks of the best writing software for authors. More tools live in the edit category.
Try ProWritingAid free or try Grammarly free.
FAQ
Is ProWritingAid better than Grammarly for novelists?
For most novelists, yes. ProWritingAid offers 25+ reports on pacing, repetition and dialogue, plus paid whole-manuscript analysis up to 300,000 words and a Scrivener integration. Grammarly is better for general proofreading across apps but has no comparable story-level analysis, so it works best as a companion for emails and web writing.
Which is cheaper, Grammarly or ProWritingAid?
ProWritingAid Premium is $120 a year against Grammarly Pro at $144 a year, as of the dates above. ProWritingAid also offers a $399 lifetime licence. But whole-manuscript reports need extra Story Credits, so ProWritingAid can cost more if you run them often. Monthly billing is $30 on both.
Can Grammarly check a whole novel?
Partly. The Grammarly web editor handles 100,000 characters at a time, roughly 16,000 words, and uploads are capped at 4 MB. The Windows and Mac apps have no limit beyond your text editor. Support also lists monthly document and word caps, so check the current limits before editing a full book.
Does ProWritingAid use my writing to train AI?
No, according to ProWritingAid. Its help centre says it never uses your work to train its AI models or algorithms, and it keeps text only while processing it. Documents you save in its Web Editor are the exception, since they're stored encrypted in the cloud. Grammarly, by contrast, has training on by default for individual accounts.
Does ProWritingAid work with Scrivener?
Yes. ProWritingAid lists Scrivener among its integrations, and its help centre explains how to run Manuscript Analysis there, using the full document view so it runs on your whole manuscript. You need the Desktop Everywhere app for Windows or Mac. For drafts you manage in Scrivener, ProWritingAid's reports are the stronger fit, since Grammarly has no story-level reports.
Is the ProWritingAid lifetime licence worth it?
Only if you'll use it for over three years. At $399 it breaks even against the $120 annual plan after roughly three and a third years, by our arithmetic. Annual and lifetime plans are refundable only within three days, and lifetime doesn't include Story Credits. If you're unsure, buy annual first.
