Grammarly vs Undetectable AI
Side-by-side comparison of features, pricing, and quality scores.
90Quality
Grammarly
AI-powered writing assistant that checks grammar, spelling, tone, and clarity, now with generative AI writing features.
View DetailsVS
75Quality
Undetectable AI
AI text humanizer that rewrites AI-generated content to bypass AI detection tools while preserving meaning.
View Details| Feature | Grammarly | Undetectable AI |
|---|---|---|
| Quality Score | 90 | 75 |
| Pricing | $0 free / $12/mo Premium / $15/member/mo Business | Free detection check / $9.99/mo Starter |
| Monthly Visits | 60M | 10M |
| User Rating | 4.5 | 4.1 |
| Launched | 2009 | 2023 |
| Free Plan | Yes | Yes |
| API Available | No | Yes |
| Platforms | web, chrome-extension, macos, windows, ios, android | web |
| Key Features | grammar-check, tone-detection, clarity-suggestions, plagiarism-detection, generative-ai, style-guide, brand-tones | ai-humanization, detection-bypass, rewriting, detection-check |
Which is better: Grammarly or Undetectable AI?
Grammarly has a higher quality score (90 vs 75), indicating better overall quality and user satisfaction. Grammarly is freemium ($0 free / $12/mo Premium / $15/member/mo Business) while Undetectable AI is freemium (Free detection check / $9.99/mo Starter).