Grammarly vs QuillBot
A detailed side-by-side comparison to help you choose the right AI writing agent for your needs.
Best for editing and content integrity
Grammarly
Grammarly has expanded far beyond grammar checking into a comprehensive writing assistant with critical features for academic and professional integrity. The plagiarism detector scans against 16 billi...
AI Models
GrammarlyGOProprietary NLP and detection models
Key Features
- Grammar and plagiarism checking against 16B web pages
- Auto-citations from 20+ research databases in multiple formats
- AI content detection and Authorship tracking (AI vs typed)
- Humanize feature for naturalizing AI-generated text
- GrammarlyGO for drafting, brainstorming, rephrasing
Pricing
Free — $0/month
Pro — $12/month
Enterprise — Custom pricing
Pros
- Plagiarism detection essential for academic integrity
- AI detection and authorship tracking unique in market
- Cross-platform availability fits any workflow
Cons
- Premium required for most valuable features
- Some suggestions can be overly prescriptive
Best for paraphrasing and rewriting
QuillBot
QuillBot is an AI-powered writing assistant ranked #43 on the a16z Top 100 Gen AI Apps list, specializing in paraphrasing, grammar correction, and text enhancement. The platform's core paraphraser off...
AI Models
Proprietary NLP modelsCustom paraphrasing models
Key Features
- 9+ paraphrasing modes with custom mode support: Standard, Fluency, Formal, Simple, Creative, Expand, Shorten
- AI grammar checker with contextual suggestions
- Plagiarism detector comparing against billions of sources
- Text summarizer for condensing long documents
- Citation generator supporting APA, MLA, Chicago formats
Pricing
Free — $0/month
Premium — $8.33/month
Team — $7.95/user/month
Pros
- Seven paraphrasing modes cover virtually any rewriting need
- 50M+ users validate reliability for academic and professional use
- Browser extension integrates seamlessly into existing writing workflows
Cons
- Free tier limited to basic paraphrasing with word limits
- Plagiarism detection only available on Premium plans