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Tools · Comparison

Grammarly vs Penelope AI vs QuillBot

All three are writing & content tools. Here is what separates them.

GrammarlyPenelope AIQuillBot
What it isGrammarly makes AI writing convenient. Work smarter with personalized AI guidance and text generation on any app or website.Penelope AI simplifies writing: Easily rewrite, summarize, paraphrase and create articles with smart AI tools in a user-friendly editor.Rewriting, summarising and citation tools, widely used by students and non-native English writers.
CategoryWriting & ContentWriting & ContentWriting & Content
PricingFreemium · $12-$15/moFree · FreeFreemium · Free · Premium $9.95/mo
How it billsFlat monthlyFreeFlat monthly
Free tierYesYesYes
Rating4.6 from 1 reviewsNot yet ratedNot yet rated
Features
  • Grammar & spelling check
  • Tone detection
  • Clarity suggestions
  • GrammarlyGO AI writing
  • Plagiarism detection
  • Browser extension
  • Desktop app
  • Brand tones
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  • Paraphrasing in several registers
  • Summariser
  • Grammar and style checking
  • Citation generator
  • Plagiarism detection
What works
  • Works everywhere
  • Excellent accuracy
  • Free tier is useful
  • Non-intrusive
  • Trusted by millions
  • Has a free tier, so it can be tried before paying
  • Free to use
  • Sits in Writing & Content, one of the better-covered categories here — easy to compare
  • Very good at clarifying awkward prose
  • Helpful for non-native writers
  • Useful free tier
What does not
  • Premium required for advanced features
  • Can be over-aggressive
  • Limited creative writing support
  • Privacy concerns
  • 206 other tools in this catalogue claim to do the same job
  • Easily misused for academic dishonesty
  • Can flatten a distinctive voice
  • Best modes are paid
Visit GrammarlyVisit Penelope AIVisit QuillBotCompare more tools