Comparison · Last updated June 2026
Grammarly vs ProWritingAid
Grammarly is built to fix your writing in real time across every app you use; ProWritingAid is built to dissect long-form drafts with 25+ in-depth style and structure reports. Polish-on-the-fly versus deep editorial analysis.
🏆 Who should choose which?
Grammarly
ProWritingAid
Grammarly
ProWritingAid
📊 Quick specs
Quick verdict
These tools solve the same problem from opposite ends. Grammarly (ToolChase score 4.7/5) wins on ubiquity and speed: it follows you into Gmail, Docs, Slack and your phone keyboard, catching errors instantly with minimal friction. ProWritingAid (4.5/5) wins on depth: its 25+ reports expose overused words, sticky sentences, pacing and dialogue problems that Grammarly never surfaces. Most everyday writers and teams will be happier with Grammarly. Authors, academics and anyone editing book-length drafts get materially more from ProWritingAid, especially via its Scrivener and Word integrations and one-time lifetime license.
Grammarly
Real-time grammar and AI writing assistant everywhere
Free · Pro $12/mo (annual) · Enterprise custom
Full review →
ProWritingAid
Deep style and structure editor for long-form writers
Free (500-word cap) · Premium $10/mo · Premium Pro $12/mo (annual)
Full review →What is Grammarly?
Grammarly is a cloud-based writing assistant that checks grammar, spelling, punctuation, clarity and tone as you type. Its real strength is reach: a browser extension, native desktop apps, a mobile keyboard and integrations across Gmail, Outlook, Google Docs, Slack and hundreds of thousands of other sites mean it works almost everywhere you write without copy-pasting. Beyond corrections it offers generative AI for drafting, rewriting, shortening and replying, plus tone detection, a plagiarism checker and AI-text detection on paid plans. It is optimized for fast, low-friction polish on emails, documents and everyday professional writing.
What is ProWritingAid?
ProWritingAid is a writing editor aimed at long-form and creative writers. Alongside standard grammar and spelling checks, it runs more than 25 specialized reports: overused words, sentence-length variation, sticky sentences, readability, pacing, dialogue tags, clichés, echoes and more. It integrates deeply with Scrivener and Microsoft Word, plus a browser extension and desktop app, so novelists and academics can analyze entire manuscripts in their existing tools. AI Sparks add rewrite and brainstorming suggestions, and a one-time lifetime license is available. It trades Grammarly's everywhere-you-type convenience for substantially deeper editorial insight.
Key differences at a glance
Core philosophy: Grammarly fixes writing in real time as you type, anywhere; ProWritingAid analyzes a finished or in-progress draft in depth, usually inside Word, Scrivener or its own editor.
Analysis depth: ProWritingAid offers 25+ dedicated reports (pacing, sticky sentences, overused words, dialogue, echoes). Grammarly gives clarity, tone and a lighter performance report, enough for everyday writing, thin for manuscripts.
Reach and platforms: Grammarly runs in browsers, desktop apps and a mobile keyboard across 500,000+ sites and apps. ProWritingAid covers browser, desktop, Word and Scrivener but has no mobile keyboard.
Pricing shape: Grammarly is subscription-only (Free, Pro $12/mo annual, Enterprise custom). ProWritingAid offers the same tiers plus a one-time lifetime license ($399 Premium / $699 Premium Pro), which can be cheaper long-term.
Free tier limits: Grammarly's free plan is unlimited for grammar, spelling and tone (AI prompts capped at 100/mo). ProWritingAid's free plan includes the full checker but caps each check at 500 words, so it is impractical for long documents.
AI features: Grammarly leans into generative AI for drafting and rewriting with a generous 2,000 prompts/mo on Pro. ProWritingAid's AI Sparks focus on rephrasing and brainstorming and are capped per day depending on plan.
Pros and cons
Grammarly
Strengths
- Works almost everywhere you write, browser, desktop, Gmail, Docs, Slack and a mobile keyboard
- Instant, low-friction real-time corrections with minimal setup
- Genuinely useful free tier with unlimited grammar and spelling checks
- Strong generative AI for drafting, rewriting and tone adjustment (2,000 prompts/mo on Pro)
- Plagiarism and AI-text detection bundled into the single Pro plan
Limitations
- Style feedback is surface-level, no pacing, echo or manuscript-structure analysis
- Subscription-only; no lifetime license and Enterprise pricing is opaque
- Free-plan AI prompts are limited to 100 per month
ProWritingAid
Strengths
- 25+ in-depth reports expose style and structure issues no quick checker catches
- Deep Scrivener and Microsoft Word integration suits book-length manuscripts
- Explains why an edit helps, so writers actually improve over time
- One-time lifetime license avoids recurring fees for long-term users
- Single Premium plan unlocks unlimited word count and all core reports
Limitations
- No mobile keyboard or app, desktop and browser only
- Reports and the desktop app have a steeper learning curve than Grammarly
- Free plan's 500-word-per-check cap makes it impractical for real documents
Pricing comparison
Grammarly offers a genuinely free plan with unlimited grammar, spelling and tone checks plus 100 AI prompts per month. Pro costs $12/mo billed annually (around $30/mo month-to-month) and adds full-sentence rewrites, plagiarism detection, AI-text detection and 2,000 AI prompts per month. Enterprise is custom-priced and adds SSO, admin controls and security features like BYOK and DLP. There is a 7-day free trial of Pro but no lifetime option. Verified June 2026 from www.grammarly.com.
ProWritingAid offers a free plan that includes the full grammar checker and reports but caps each check at 500 words. Premium runs $10/mo billed annually ($120/year, or $30/mo monthly) and unlocks unlimited word count, unlimited report runs and all 25+ reports. Premium Pro adds more daily AI Sparks, chapter critiques and community workshops at $12/mo annually ($144/year, or $36/mo monthly). Uniquely, lifetime licenses are available as a one-time $399 (Premium) or $699 (Premium Pro). Note: 2026 pricing rose notably from prior years. Verified June 2026 from prowritingaid.com.
On a like-for-like annual subscription the two are nearly identical ($12 vs $10/mo for the entry paid plan), so price rarely decides it, but ProWritingAid's one-time lifetime license can be far cheaper for writers who plan to use it for years. For team-by-team cost modelling, use our AI Cost Calculator.
Which tool should you choose?
Choose Grammarly if you…
- → You write across many apps and want corrections to follow you everywhere, including your phone
- → You need fast, real-time polish on emails, documents and everyday professional writing
- → You want strong generative AI for drafting and rewriting built into the same tool
Choose ProWritingAid if you…
- → You edit long-form work, novels, theses, long articles, and need pacing, echo and structure reports
- → You write in Scrivener or Microsoft Word and want deep analysis inside those tools
- → You prefer a one-time lifetime license over an ongoing subscription
Not sure which fits your workflow? Take our AI Tool Finder Quiz for a recommendation based on your role and needs.
Bottom line: Grammarly vs ProWritingAid
Grammarly and ProWritingAid both check grammar well, so the decision comes down to how and what you write. Grammarly is the better default for the majority of people: it is faster, follows you into every app and phone, has the more usable free tier, and bundles generative AI for drafting. ProWritingAid is the specialist's choice, its 25+ reports and Scrivener/Word integration give long-form and creative writers editorial depth Grammarly simply does not attempt.
ToolChase scores Grammarly 4.7/5 for its all-round polish and reach, and ProWritingAid 4.5/5 for its depth on long-form work. Pick Grammarly for everyday and team writing; pick ProWritingAid if manuscripts and craft improvement are your priority, and weigh its lifetime license if you write for the long haul.
🔄 Switching? Keep in mind
The tools store suggestions and style settings separately, so there is no automatic transfer of dictionaries, ignored words or custom style rules, budget time to rebuild those. If you move from Grammarly to ProWritingAid, expect a more report-driven, document-upload workflow rather than always-on inline hints, and note you lose the mobile keyboard. Going the other way, you trade ProWritingAid's deep reports for Grammarly's broader app coverage. Run both free tiers in parallel for a week before committing.
Frequently asked questions
Is Grammarly or ProWritingAid more accurate at catching grammar errors?
Both are highly accurate on core grammar, spelling and punctuation, and in practice the difference is small. Independent tests suggest Grammarly catches a few more basic typos and flags them faster in real time, while ProWritingAid catches the same errors but explains why a fix improves the sentence. For raw error-catching they are close; ProWritingAid pulls ahead on deeper style and structure issues that Grammarly does not analyze.
Which one is better for writing a novel or long manuscript?
ProWritingAid is the stronger choice for book-length work. Its 25+ reports cover pacing, repeated words, sticky sentences, dialogue tags and echoes, and it integrates directly with Scrivener and Microsoft Word so you can analyze whole chapters in place. Grammarly handles long documents but offers only light style feedback and no manuscript-structure tools, making it better suited to shorter, everyday writing than to editing a full novel.
Do both Grammarly and ProWritingAid have a free plan?
Yes, both offer free plans, but they differ. Grammarly's free tier gives unlimited grammar, spelling and tone checks plus 100 AI prompts per month, so it is usable for daily writing. ProWritingAid's free tier includes the full checker and reports but caps each check at 500 words, which makes it fine for testing the tool but impractical for editing real documents without upgrading to Premium.
Is ProWritingAid cheaper than Grammarly?
On annual subscription they are nearly the same, ProWritingAid Premium is about $10/mo versus Grammarly Pro at $12/mo. Where ProWritingAid can be much cheaper is its one-time lifetime license ($399 Premium, $699 Premium Pro), which Grammarly does not offer. For writers who plan to use the tool for several years, the lifetime option can cost less overall than years of subscription fees.
Can I use both Grammarly and ProWritingAid together?
You can, and some writers do, but running both on the same text at once can cause overlapping highlights and conflicting suggestions in the same editor. A common approach is to use Grammarly for quick real-time polish in browsers, email and on mobile, then run a finished long-form draft through ProWritingAid's reports for a deeper editorial pass. Disable one extension while the other is active to avoid clutter.
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