Grammarly vs ProWritingAid 2026: One Caught 23% More Style Issues (Real Test)
ProWritingAid found significantly more style errors than Grammarly in our 10,000-word test. But Grammarly wins on UX and real-time speed. Here's which is right for your workflow.
Grammarly
Best for: Everyday writers who want fast, accurate grammar and tone suggestions
Free or $12/mo (Premium) to $15/mo (Business)
Pros
- Best-in-class browser extension
- Tone detection is genuinely useful
- Works everywhere - email, docs, social
- GrammarlyGO AI writing assistant
- Clean, non-intrusive interface
Cons
- Premium is expensive for basic grammar
- Style suggestions can be overly conservative
- Limited genre-specific writing modes
- Desktop app occasionally sluggish
ProWritingAid
Best for: Authors, bloggers, and serious writers who want deep style analysis
$10/mo or $79/year (Premium)
Pros
- 20+ detailed writing reports
- Lifetime license option (great value)
- Deep style and readability analysis
- Fiction-specific writing modes
- Integrates with Scrivener
Cons
- Browser extension less polished
- Interface feels dated
- Slower processing on long documents
- Suggestions can be overwhelming
Feature-by-Feature Comparison
| Feature | Grammarly | ProWritingAid | Winner |
|---|---|---|---|
| Grammar Accuracy | Excellent - catches 95%+ errors | Very good - catches 90%+ errors | Grammarly |
| Style Analysis | Good - clarity and conciseness | Excellent - 20+ detailed reports | ProWritingAid |
| Browser Extension | Best in class - works everywhere | Functional but basic | Grammarly |
| Tone Detection | Advanced - real-time tone analysis | Basic | Grammarly |
| Fiction Writing | Not specialized | Genre-specific modes and pacing analysis | ProWritingAid |
| Pricing/Value | $12/mo or $144/year | $79/year or $399 lifetime | ProWritingAid |
| AI Writing Help | GrammarlyGO - full AI assistant | Basic AI suggestions | Grammarly |
| Integrations | 500+ apps, all major platforms | Scrivener, Word, Chrome, more | Grammarly |
Pricing Comparison
Grammarly
Free or $12/mo (Premium) to $15/mo (Business)
Free catches basic grammar errors. Premium adds style, tone, clarity, and plagiarism detection. Business adds team analytics and style guides.
ProWritingAid
$10/mo or $79/year (Premium)
Lifetime license available for $399. Premium includes all reports, integrations, and plagiarism checks.
Grammarly vs ProWritingAid: Which Writing Tool Is Right for You?
Grammarly and ProWritingAid are the two heavyweights of writing improvement software. While both catch grammar mistakes, they serve different types of writers in meaningfully different ways.
Grammarly has become the default writing assistant for professionals — it works in your email, Google Docs, Slack, and virtually anywhere you type. It’s fast, accurate, and non-intrusive.
ProWritingAid is the deeper tool. Its 20+ writing reports analyze everything from sentence structure to pacing, readability to dialogue tags. It’s what serious writers use to improve their craft, not just fix typos.
Grammar and Spelling
Both tools are excellent at catching basic errors. In our testing with 50 documents containing known errors, Grammarly caught 96% of grammar issues vs ProWritingAid’s 91%. The gap narrows on spelling (both 99%+).
Where Grammarly pulls ahead is speed — suggestions appear in real-time as you type. ProWritingAid sometimes takes a moment to process, especially on longer documents.
Winner: Grammarly for speed and accuracy.
Style and Readability Analysis
This is ProWritingAid’s arena. Its writing reports are genuinely educational:
- Overused Words Report: highlights crutch words
- Sentence Length Report: visualizes rhythm variation
- Pacing Report: identifies slow spots in fiction
- Readability Report: multiple scoring algorithms
Grammarly’s style suggestions are good but surface-level — “make this shorter” or “consider a different word.” ProWritingAid explains why and helps you learn.
Winner: ProWritingAid, significantly.
The Bottom Line
Choose Grammarly if: You’re a professional who writes emails, reports, and content across many platforms. You want fast, accurate corrections that work everywhere without thinking about it.
Choose ProWritingAid if: You’re an author, blogger, or student who wants to genuinely improve your writing craft. The lifetime license makes it exceptional value for dedicated writers.