Grammarly AI vs ProWritingAid: Complete Comparison 2026
An in-depth comparison of features, pricing, and user experience to help you make the right choice.
Grammarly AI
8.5(8,500 reviews)
AI writing assistant combining grammar checking, tone detection, and generative AI to help teams write clearly and on-brand.
ProWritingAid
8.3(1,900 reviews)
Advanced writing analysis tool offering deep style reports, readability scores, and 20+ writing improvement checks.
Quick Comparison
| Aspect | Grammarly AI | ProWritingAid |
|---|---|---|
| Best For | Professionals who write daily and need everything polished before sending | Novelists and long-form fiction writers who use Scrivener |
| Pricing Model | Freemium | Freemium |
| Starting Price | Free | Free |
| Deployment | cloud | cloud |
| Platforms | WEB, IOS, ANDROID, MAC, WINDOWS | WEB, WINDOWS, MAC |
| Rating | 8.5/10 | 8.3/10 |
Pros & Cons
Grammarly AI
Pros
- Works everywhere you write - browser, desktop, mobile, Slack, Docs, Office, Notion
- Grammar and tone correction engine is still the most accurate in the industry
- Free tier is genuinely useful with basic corrections and 100 AI prompts monthly
- GrammarlyGO rewrites and compositions are clean and professional for business use
- Over 30 million daily users means the product is battle-tested at massive scale
Cons
- Can't generate long-form content from scratch like Jasper or Writesonic
- GrammarlyGO prompt limits (100-1,000/month) frustrate heavy AI users
- SEO features are minimal - no keyword research or content optimization scoring
- AI suggestions sometimes over-correct casual writing into stiff corporate tone
- Premium at $12/month feels pricey for what many still perceive as a grammar checker
ProWritingAid
Pros
- Twenty-plus writing reports analyze style, structure, readability, and pacing
- Lifetime license at $399 is rare in SaaS and great long-term value
- Scrivener integration gives it an edge for novelists over Grammarly
- Teaches you to write better through explanations, not just corrections
- Handles documents up to 100,000 words without performance issues
- Cheaper than Grammarly at $10/month vs $12/month
Cons
- Interface looks outdated compared to Grammarly and newer competitors
- Real-time suggestions are noticeably slower than Grammarly
- Mobile experience is essentially non-existent
- Depth of reports can overwhelm users who just want quick fixes
- Plagiarism checker limited to 50 checks per year on Premium
Pricing Comparison
| Product | Pricing Model | Starting Price |
|---|---|---|
| Grammarly AI | freemium | Free0 |
| ProWritingAid | freemium | Free0 |
Our Verdict
Choose Grammarly AI if...
Professionals who write daily and need everything polished before sending
Choose ProWritingAid if...
Novelists and long-form fiction writers who use Scrivener
Still Not Sure?
Explore more alternatives or read in-depth reviews to make your decision.