QuillBot
AI writing assistant with a paraphrasing engine used by 35M+ students and professionals - rewrite, summarize, and check grammar instantly.
QuillBot is one of the most widely used AI writing assistants, best known for its paraphrasing engine that rewrites text while preserving meaning across 8 modes including Standard, Fluency, Formal, and Academic. Beyond paraphrasing, QuillBot offers grammar checking, summarization, citation generation, plagiarism detection, and a Co-Writer mode that integrates with Google Docs and Microsoft Word via browser extension. Founded in 2017 by Rohan Gupta and team, QuillBot was acquired by Course Hero in 2021 in a deal that validated it as one of the dominant consumer writing AI tools. As of 2025, QuillBot has 35M+ users globally with a freemium model starting at around $10/month for the Premium plan.
Key Features
- Paraphrasing engine with 8 modes including Standard, Fluency, Formal, and Academic
- Grammar checker that identifies and fixes spelling, grammar, and punctuation errors across any text
- Summarizer that condenses long articles, papers, or passages into key bullet points
- Citation generator supporting APA, MLA, Chicago, and Harvard formats from URLs and DOIs
- Co-Writer mode with Google Docs and Microsoft Word browser extension integration
- Plagiarism Checker (Premium) scans against billions of web pages for similarity detection
- Translate text into and out of 30+ languages with paraphrasing applied to the output
Use Cases
- Students paraphrasing source material for essays while avoiding accidental plagiarism
- ESL professionals polishing emails and reports to sound more natural in English
- Content writers rewriting existing articles for different audiences or publication platforms
- Academic researchers summarizing long papers to extract key arguments and findings quickly
Pros
- Paraphrasing quality is consistently strong - academic mode preserves meaning better than most competitors
- Free tier is genuinely usable with no time limit - covers shorter texts without any subscription
- Native Google Docs and Microsoft Word extension removes the need to switch browser tabs while editing
Cons
- Free plan restricts paraphrase input to 125 words - impractical for anything longer than a paragraph
- Plagiarism checker is paywalled behind Premium - a standard feature included in many competing tools
- Overuse of the paraphrasing tool can strip personality and voice from creative or editorial writing
QuillBot Alternatives
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