Skip to main content

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
EnterpriseCustom 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