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ProWritingAid and Grammarly are the two leading style/grammar editors, but they target different writers. Grammarly is the everyday-writing default with the broadest ecosystem. ProWritingAid is the long-form/fiction default with deeper style reports. Neither leads on AI detection. SynthQuery is included as a third option for writers who need detection-aware rewriting.
Grammarly for everyday writing across email, docs, and web. ProWritingAid for novelists and long-form non-fiction writers who want deep style reports. SynthQuery for writers who draft with AI assistance and need detection-aware rewriting plus SEO scoring.
| Feature | Prowritingaid | Grammarly |
|---|---|---|
| Grammar coverage | Solid — covers most cases | Grammarly: broadest; ProWritingAid: deeper for long-form |
| Style reports | Lighter — readability + tone analysis | ProWritingAid: deepest reports (overused words, sticky sentences, pacing) |
| AI detection | Multi-model detection | Grammarly: light/recent; ProWritingAid: none |
| Humanizer / rewriter | 7 modes with detector feedback | Grammarly: sentence rewrite; ProWritingAid: none |
| Integrations | Web + paste | Grammarly: native everywhere; ProWritingAid: Word/Scrivener/Docs/browser |
| Long-form / fiction support | Article rewriter, not fiction-specific | ProWritingAid: best-in-class; Grammarly: limited |
| SEO content scoring | Yes | Neither |
| Plagiarism | Yes | Both: yes (paid) |
| Lifetime license | Subscription only | ProWritingAid: yes (~$399); Grammarly: subscription |
| Free tier | Yes | Grammarly: yes; ProWritingAid: limited free |
| Plan | Prowritingaid | Grammarly |
|---|---|---|
| Free | Yes | Grammarly: free; PWA: limited |
| Starter | $9.99/mo Starter | Grammarly Premium ~$30/mo; PWA $30/mo |
| Pro | $19.99/mo Pro | Grammarly Business ~$15/seat; PWA lifetime ~$399 |
Writers who draft with AI assistance and need detection-aware rewriting plus SEO scoring — content marketers, freelancers writing for detector-checking clients, editorial teams.
Grammarly for everyday writing across all platforms. ProWritingAid for novelists and long-form non-fiction writers who want deep style reports and a lifetime license.