| Website | prowritingaid.com | grammarly.com | sudowrite.com |
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| Category | AI Writing | AI Writing | AI Writing |
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| Use cases | AI for Authors, AI for Bloggers, AI for Students | AI for Bloggers, AI for Students | AI for Authors, AI for Students |
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| Pricing model | Freemium | Freemium | Free Trial |
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| Starting price | From $10 per month | From $12 per month | From $10 per month |
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| Platforms | Browser Extension, macOS, Web, Windows | Android, Browser Extension, iOS, macOS, Web, Windows | Web |
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| Key features | - Grammar, spelling and punctuation checks
- 25+ writing analysis reports (style, pacing, overused words, echoes, dialogue tags)
- AI Rephrases and Sparks
- Chapter Critique for instant chapter feedback
- Story Canvas and Outline Crafter
- Story Credits: Manuscript, Plot and Character Analysis, Virtual Beta Reader
- Custom style guide and custom dictionary
- Author comparison
+2 more on the tool page | - Real-time grammar, spelling and punctuation checks
- Tone detection and tone adjustment
- Full-sentence and paragraph rewrites
- Generative AI prompts (100 free, 2,000 on Plus/Pro)
- Plagiarism and AI-generated text detection
- Free AI Detector, no sign-up
- Humanizer and AI Detector agents
- Fluency help for English learners
+2 more on the tool page | - Write, Rewrite, Describe and Expand with story intelligence
- Matches your writing style
- Series continuity tracking
- Brainstorm characters, plots and outlines
- AI chat built for fiction
- Muse and Ballad fiction-tuned AI models
- 30+ additional AI models (incl. Anthropic and OpenAI)
- Developmental edits, line edits and beta reads (Professional/Max)
+2 more on the tool page |
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| Integrations | - Microsoft Word
- Google Docs
- Scrivener and Vellum (Desktop Everywhere)
- Chrome, Edge and Firefox extensions
- Wattpad and Atticus
- Windows and Mac desktop apps
| - Google Docs
- Microsoft Word and Outlook
- Google Chrome, Edge, Firefox and Safari
- Windows and Mac desktop apps
- iPhone and Android keyboards
| - Web app (browser)
- Anthropic Claude models
- OpenAI models
- Open-source models
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| Best for | Novelists, non-fiction authors, students with long assignments and bloggers who want deep style feedback on long-form writing | Students, professionals, bloggers and non-native English writers who want instant grammar, tone and clarity fixes wherever they write | Novelists, screenwriters, fan-fiction writers and creative writing students who want an AI partner for drafting and developing stories |
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| Pros | - 25+ in-depth reports go far beyond grammar
- Lifetime plan available ($399 in the US, ₹21,945 in India)
- Fiction tools: Chapter Critique, Manuscript Analysis, Virtual Beta Reader
- Works in Word, Google Docs and Scrivener
- Says it never stores text sent for analysis
| - Generous free plan with tone detection
- Works in browsers, Word, Google Docs and phone keyboards
- Affordable: Pro $12/month in the US, Plus ₹392/month in India
- Free AI Detector with no sign-up
- SOC 2 Type 2 report; never sells user content
| - Built specifically for fiction, with its own Muse and Ballad models
- Free trial with no credit card
- Does not train AI on your writing; claims no rights over your work
- Developmental edits, line edits and beta reads on higher plans
- Easy cancel; keep access to your projects
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| Cons | - Free plan checks only 500 words at a time
- English only
- Monthly plans are not refundable; 3-day guarantee on others
- Manuscript-level analysis needs paid Story Credits
- Plagiarism checks cost extra
| - Full-sentence rewrites and plagiarism checks need a paid plan
- Free plan limited to 100 AI prompts a month
- English only
- Uses your writing to improve its products unless you change the controls
- AI detection is not 100% accurate (Grammarly says so itself)
| - No free plan after the trial
- Credit-based limits to watch on the Hobby plan
- Priced in USD only, including in India
- Not suited to blogs, business or academic writing
- Some features may fall back to English
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ProWritingAid
Grammarly
Sudowrite