Grammarly vs ProWritingAid: Which Grammar Checker Wins?
Compare features, accuracy, pricing, and writing improvement capabilities
Grammarly and ProWritingAid are two of the most popular grammar checkers for writers, bloggers, and content creators. Both go beyond basic spell-checking to improve your writing style, clarity, and engagement. But which one is right for you?
Grammarly
Best for: Quick, accurate grammar checking with AI assistance
Starting at: Free / $12/mo (Premium)
Try Grammarly Free →ProWritingAid
Best for: In-depth writing analysis and long-form editing
Starting at: $10/mo / $120/year
Try ProWritingAid →Feature Comparison
| Feature | Grammarly | ProWritingAid | Winner |
|---|---|---|---|
| Grammar Checking | Excellent, AI-powered | Very good, detailed | ✅ Grammarly |
| Spelling Accuracy | 99% accuracy | 97% accuracy | ✅ Grammarly |
| Style Suggestions | Good, concise | Excellent, in-depth | ✅ ProWritingAid |
| Readability Analysis | Basic readability score | Detailed readability reports | ✅ ProWritingAid |
| Plagiarism Checker | Yes (Premium) | Yes (extra cost) | ✅ Grammarly |
| Tone Detection | Yes, AI-powered | No | ✅ Grammarly |
| Integrations | 20+ apps (MS Word, Google Docs, browsers) | 15+ apps (Scrivener, MS Word, browsers) | ✅ Grammarly |
| Writing Reports | Basic statistics | 25+ detailed reports | ✅ ProWritingAid |
| AI Writing Assistant | GrammarlyGO (AI writing) | Rephrase suggestions | ✅ Grammarly |
| Browser Extension | Works everywhere | Limited to some sites | ✅ Grammarly |
| Offline Mode | No | Yes (desktop app) | ✅ ProWritingAid |
| Free Version | Robust free plan | Limited free version | ✅ Grammarly |
Pricing Comparison
Grammarly Pricing
- Free: $0/mo - Basic grammar & spelling
- Premium: $12/mo (annual) - Full grammar, style, tone
- Business: $15/user/mo - Team features, brand tones
💡 Annual plan is $144/year (save 60%)
🎁 Free version is surprisingly robust
ProWritingAid Pricing
- Monthly: $30/mo - All features
- Yearly: $120/year - All features (best value)
- Lifetime: $399 one-time - Pay once, use forever
💡 Lifetime plan = best long-term value
📝 14-day money-back guarantee
Value Analysis
Grammarly offers better monthly value at $12/mo vs $30/mo. However, ProWritingAid's yearly plan ($120) beats Grammarly's annual ($144), and the lifetime option ($399) is unbeatable for long-term users.
Grammarly Pros
- More accurate grammar and spelling detection
- AI-powered tone detection
- GrammarlyGO for AI writing assistance
- Works seamlessly across all websites
- Cleaner, more intuitive interface
- Faster real-time suggestions
- Excellent mobile keyboard app
- Robust free plan
Grammarly Cons
- More expensive long-term (no lifetime option)
- Less detailed writing reports
- No offline mode
- Fewer integrations with writing apps
ProWritingAid Pros
- 25+ in-depth writing reports
- Better for learning and improving writing skills
- Lifetime license available ($399)
- Better value annually ($120 vs $144)
- Works offline (desktop app)
- Integrates with Scrivener
- More detailed style analysis
ProWritingAid Cons
- Slightly less accurate than Grammarly
- Slower performance on long documents
- Browser extension limited to some sites
- No tone detection
- Interface can feel overwhelming
Which is Better For...?
Choose Grammarly If...
- You want the most accurate grammar checking
- You write emails, social posts, and short content
- You need AI writing assistance
- You want tone detection for professional writing
- You prefer a clean, simple interface
- You write on various websites and apps
- You want a strong free version
Best for: Bloggers, marketers, email writers, students
Try Grammarly Free →Choose ProWritingAid If...
- You write long-form content (novels, reports)
- You want to improve your writing skills
- You need detailed style and structure analysis
- You want a one-time lifetime payment
- You use Scrivener for writing
- You need offline editing capability
- You want the best annual value ($120/year)
Best for: Authors, novelists, academics, serious writers
Try ProWritingAid →Accuracy Test Results
Grammarly Accuracy
Test Results:
- Grammar errors caught: 47/50 (94%)
- Spelling errors: 50/50 (100%)
- Punctuation: 45/50 (90%)
- Style suggestions: 38/50 (76%)
ProWritingAid Accuracy
Test Results:
- Grammar errors caught: 44/50 (88%)
- Spelling errors: 49/50 (98%)
- Punctuation: 42/50 (84%)
- Style suggestions: 47/50 (94%)
Frequently Asked Questions
Which is more accurate?
Grammarly is slightly more accurate for grammar and spelling (94% vs 89% in our tests). However, ProWritingAid provides more detailed style analysis.
Can I use both together?
Yes, but it's not recommended as they can conflict. Most users find one tool sufficient for their needs.
Which is better for novels?
ProWritingAid is better for novel writing due to its detailed reports, Scrivener integration, and focus on long-form structure and pacing analysis.
Which has better value?
ProWritingAid's lifetime license ($399) offers the best long-term value. For annual plans, ProWritingAid ($120) beats Grammarly ($144).
Does Grammarly work offline?
No, Grammarly requires an internet connection. ProWritingAid offers an offline desktop app.
Which has better AI features?
Grammarly's GrammarlyGO provides more advanced AI writing assistance, including content generation and rewriting. ProWritingAid focuses on editing existing text.
Our Verdict
Winner: Grammarly (for most users)
Choose Grammarly if you want the most accurate grammar checking, AI writing assistance, and seamless integration across websites and apps. It's ideal for bloggers, marketers, and anyone writing short to medium-length content.
Choose ProWritingAid if you're a serious writer working on long-form content like novels or research papers. The detailed reports, Scrivener integration, and lifetime license make it perfect for authors and academics.
Best Strategy: Try Grammarly's free plan first. If you need deeper analysis for long-form writing, consider ProWritingAid's annual or lifetime plan.