AI paraphraser, grammar checker, summarizer and AI detector popular with students and writers.
Grammarly vs ProWritingAid
Features, pricing, strengths and trade-offs — and which one fits your situation.
The verdict
Editor’s verdict
Grammarly focuses on quick, clear corrections everywhere you type, while ProWritingAid focuses on in-depth style analysis for long documents such as novels and theses. Choose Grammarly if most of your writing is emails, business documents and messages, if you need support on mobile or in many apps, if you write in languages other than English, or if your team needs style guides, snippets and analytics. Choose ProWritingAid if you are working on a manuscript and want detailed reports on pacing, dialogue, repetition and readability, integration with Scrivener, and AI feedback such as Chapter Critique and Manuscript Analysis; its lifetime purchase option can also suit long-term writers. ProWritingAid supports English only and its many reports take time to learn, while Grammarly offers less structural feedback on fiction. Writers who mainly need content generated for them, rather than edited, should look at an AI writing platform instead of either.
Both Grammarly and ProWritingAid offer a free plan, so you can try each before paying.
Which should you choose?
Choose Grammarly if…
- You need catching errors and polishing tone in everyday writing across the apps you already use
- You're one of: professionals writing emails and documents, students, non-native english writers
- You want something quicker to learn
- Works almost everywhere you type, including a mobile keyboard
Choose ProWritingAid if…
- You need deep style and structure editing for novelists and long-form writers
- You're one of: fiction authors, non-fiction and long-form writers, editors
- More detailed style reports than general-purpose checkers
At a glance
| Grammarly | ProWritingAid | |
|---|---|---|
| Best for | Catching errors and polishing tone in everyday writing across the apps you already use | Deep style and structure editing for novelists and long-form writers |
| Free plan | Yes | Yes |
| Starting price | From $12/mo | From $10/mo |
| Learning curve | Low | Medium |
| Platforms | Web, Windows, macOS, iOS, Android, Chrome extension | Web, Windows, macOS, Chrome extension |
| Ideal for | Professionals writing emails and documents, Students, Non-native English writers, Business and support teams | Fiction authors, Non-fiction and long-form writers, Editors, Students writing theses |
Feature comparison
| Grammarly | ProWritingAid | |
|---|---|---|
| Grammar & style checking | Yes | Yes |
| Paraphrasing / rewriting | Paid plans only | Yes |
| Long-form drafting | Limited | Limited |
| Brand voice / style guide | Paid plans only | Limited |
| Plagiarism checker | Paid plans only | Limited |
| AI content detection | Paid plans only | — |
| Works in browser / other apps | Yes | Yes |
| Languages | English + 5 (translation 19) | English only |
| Team workspace | Yes | Limited |
IncludedLimited / higher plansNot available— Not confirmed
Security & enterprise
| Grammarly | ProWritingAid | |
|---|---|---|
| Business / enterprise plan | Yes | Yes |
| SSO (SAML / OIDC) | Enterprise plan | Enterprise plan |
| SCIM user provisioning | — | — |
| SOC 2 | Type II | — |
| ISO 27001 | Yes | — |
| HIPAA (BAA available) | Enterprise (BAA) | — |
| GDPR DPA | Yes | Enterprise plan |
| Data residency options | — | US, EU (Azure) |
| No training on your data | — | Yes |
| Audit logs | — | — |
| Admin controls | Yes | Yes |
| Deployment | Cloud | Cloud |
From each vendor's security documentation. "—" = not confirmed. What to ask vendors · Compare all tools
What each tool does
Grammarly
Grammarly is an AI writing assistant that checks grammar, spelling, clarity and tone as you type in browsers, desktop apps, Microsoft Office, Google Docs and mobile keyboards. It also generates and rewrites text, and paid plans add plagiarism and AI-content detection, style guides and brand tones. Its parent company rebranded as Superhuman in 2025, but Grammarly continues as the writing assistant product.
Key features- Real-time grammar, spelling, clarity and tone suggestions
- Full-sentence rewrites and generative AI prompts
- Plagiarism and AI-content detection (paid)
- Style guides and brand tones for teams
- Grammar checks in five languages beyond English, translation into 19
- Works in browsers, desktop apps, Office, Google Docs and mobile
ProWritingAid
ProWritingAid is a grammar checker and style editor with 25+ reports covering readability, pacing, dialogue, overused words and more. It adds AI tools such as Rephrase, Sparks, Chapter Critique and full Manuscript Analysis, plus a Virtual Beta Reader and story planning tools. It is used mostly by fiction authors, non-fiction writers and editors working on long documents.
Key features- 25+ in-depth writing reports (pacing, dialogue, readability)
- Rephrase and Sparks AI suggestions
- Chapter Critique and Manuscript Analysis
- Story Canvas planning tools
- Integrations with Word, Google Docs and Scrivener
- Desktop apps and browser extensions
Pricing
Grammarly
Free plan. Pro ~$12/mo billed annually or ~$30 monthly. Enterprise custom.
ProWritingAid
Free plan. Premium ~$10/mo billed annually ($120/yr) or $30 monthly; Premium Pro ~$144/yr; lifetime options.
Prices last checked September 2026. Plans change often — confirm on each vendor's site.
Pros and cons
Grammarly
Strengths- Works almost everywhere you type, including a mobile keyboard
- Clear, easy-to-accept suggestions with little setup
- Team features include style guides, snippets and analytics
- Has a useful free plan
- Rewrites, tone adjustment, plagiarism and AI detection require a paid plan
- Generative AI prompts are capped per month except on Enterprise
- Less depth for fiction and long manuscripts than specialist editors
- Full-sentence grammar support outside English covers only five languages
Not ideal for: Novelists wanting in-depth manuscript analysis, or marketers who need long-form content generated at scale, should look at specialist tools.
ProWritingAid
Strengths- More detailed style reports than general-purpose checkers
- Handles full-length manuscripts on paid plans
- Works in Scrivener, Word, Google Docs and more
- Lifetime purchase option available
- English only
- Free plan limits checks to short passages a few times per day
- Interface with many reports can feel overwhelming
- Manuscript Analysis requires separately purchased story credits
Not ideal for: People who mainly need quick fixes in emails and chat, or writing in languages other than English, will find lighter or multilingual tools easier.
Integrations
Grammarly
ProWritingAid
FAQ
What is the main difference between Grammarly and ProWritingAid?
Grammarly is built for catching errors and polishing tone in everyday writing across the apps you already use; ProWritingAid is built for deep style and structure editing for novelists and long-form writers.
Is Grammarly or ProWritingAid cheaper?
Grammarly starts from $12/mo and ProWritingAid starts from $10/mo (as of September 2026). On entry price, ProWritingAid is cheaper — but compare what each plan includes, since limits differ. Always confirm current pricing on each vendor's site.
Do Grammarly and ProWritingAid have free plans?
Both Grammarly and ProWritingAid offer a free plan, so you can try each before paying.
Which is easier to use, Grammarly or ProWritingAid?
Grammarly is generally quicker to learn (Grammarly: low, ProWritingAid: medium learning curve).
What are good alternatives to Grammarly and ProWritingAid?
Other writing tools worth comparing include QuillBot, Writesonic and Koala AI.
