Why it matters
- 35 million monthly active users make it the most popular AI paraphrasing tool by a wide margin.
- The only AI writing tool with an integrated paraphraser + grammar checker + summarizer + plagiarism checker + citation generator in one platform.
- Academic-grade paraphrasing modes make it uniquely useful for students, researchers, and ESL writers who need correct, natural-sounding rewrites.
- Premium pricing is significantly lower than Grammarly or Jasper, making it accessible to students on tight budgets.
Key capabilities
- Paraphraser: Rewrite text in 8 modes with adjustable synonym replacement intensity (slider control).
- Grammar checker: Fix grammar, spelling, punctuation, and style issues — free tier includes basic corrections.
- Summarizer: Condense long articles, papers, or documents into bullet points or paragraph summaries.
- Citation generator: Automatically format citations in APA, MLA, Chicago, and Harvard styles from URLs, DOIs, or manual entry.
- Plagiarism checker (Premium): Compare against academic databases and the web; similarity percentage and highlighted matches.
- Word flipper: Synonym suggestions inline — click any word to see AI-powered alternatives with context-aware ranking.
- Chrome extension: Use QuillBot's paraphraser in Gmail, Google Docs, and any web text field.
- MS Word add-in: QuillBot Premium integrates directly into Microsoft Word.
Technical notes
- Free tier: 125 words/paraphrase, 3 modes, limited synonym changes
- Premium: Unlimited words, all 8 modes, full grammar checker, plagiarism checker (~$9/mo or ~$4/mo annual)
- Languages: English only for most features; some paraphrasing in Portuguese, Spanish, French, German, and others
- Browser extension: Chrome (and Chromium-based browsers)
- Integrations: Microsoft Word add-in (Premium), Chrome extension, Google Docs (via extension)
- Founded: 2017 by Rohan Gupta and David Silin; acquired by Course Hero in 2021
Ideal for
- Students writing essays, reports, and research papers who need help rewriting content in their own words.
- ESL (English as a Second Language) writers who want natural-sounding, grammatically correct English.
- Researchers who need to rephrase cited material while maintaining academic tone and accuracy.
Not ideal for
- Long-form content generation from scratch — QuillBot rewrites existing text, it doesn't generate new content.
- Marketing copywriting workflows — Jasper or Writesonic are better suited for marketing content creation.
- Users who primarily need real-time grammar assistance while typing (Grammarly's browser extension is better for that).
See also
- Grammarly — Real-time grammar and writing assistant with broader platform coverage.
- Wordtune — AI sentence rewriter focused on tone and fluency for professional writing.
- Writesonic — AI writing platform for content generation and marketing copy.