QuillBot
ChallengerAI paraphrasing and grammar checking tool for better writing
👥 10M+ users💰 Acquired by Course Hero ($1.1B)
✓ Last verified: March 2026
QuillBot is an AI-powered paraphrasing tool that rewrites text while preserving meaning, offering multiple writing modes from standard to creative. It also includes a grammar checker, summarizer, citation generator, and plagiarism detector used widely by students and professionals.
Our Ratings
9
Ease of Use
7
Output Quality
8
Value
5
Support
7
Versatility
Key Features
- ✓Paraphraser with 7 writing modes including fluency and creative
- ✓Grammar checker with contextual corrections
- ✓AI-powered text summarizer
- ✓Citation generator in MLA, APA, and Chicago formats
- ✓Plagiarism checker with web source comparison
Best For
- 👍 Students paraphrasing research for academic papers
- 👍 Writers avoiding repetitive phrasing in their work
- 👍 Professionals checking grammar before sending communications
Limitations
- ⚠️ Free tier has a 125-word paraphrasing limit per use
- ⚠️ Creative mode can sometimes alter the original meaning
- ⚠️ Plagiarism checker has limited page scans on lower plans
Integrations
Google DocsMicrosoft WordChrome ExtensionmacOS App
Quick Facts
DifficultyBeginner
Team sizesolo
API accessNo
Mobile appYes
Data privacymedium