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QuillBot
AI paraphrasing and grammar tool trusted by 35 million students and professional writers worldwide.
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About QuillBot
QuillBot is one of the most widely used AI writing tools globally, with over 35 million users relying on its paraphrasing, grammar checking, summarisation and citation generation suite. The core Paraphraser offers eight rewrite modes — Standard, Fluency, Formal, Academic, Simple, Creative, Shorten and Expand — giving precise control over how text is transformed. A synonym slider adjusts the proportion of words changed from light editing to heavy paraphrase, with colour-coded highlighting showing every modification. The Grammar Checker corrects errors with plain-language explanations for each fix rather than just underlining them. The Summarizer condenses any text to key points in paragraph or bullet form. The Citation Generator supports APA, MLA, Chicago and Harvard formats and is used extensively by students. QuillBot Co-Writer integrates all tools in a single distraction-free editor with AI autocomplete. Particularly dominant in the education and ESL writing assistance market where the quality of its free plan has no equal.
Key Features
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Paraphraser : 8 modes with adjustable synonym slider and change highlighting
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Grammar Checker : Error correction with plain-language explanations
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Summarizer : Paragraph or bullet-point condensation of any text
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Citation Generator : APA, MLA, Chicago and Harvard format support
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Co-Writer : Integrated editor with AI autocomplete and all tools in one panel
Pros
- ✓Eight distinct paraphrase modes for precise style control
- ✓Synonym slider with colour-coded change highlighting
- ✓Citation generator for APA, MLA, Chicago and Harvard styles
- ✓Best and most generous free plan in academic writing tools
- ✓Chrome extension brings all tools to any web text field
Cons
- ✗Aggressive paraphrase can subtly shift the original meaning
- ✗Not designed for generating original content from scratch
- ✗Premium plan required for longer text processing limits
Who is using QuillBot?
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Students, academic researchers, ESL writers, content editors, teachers and professional writers of all skill levels.
Use Cases
- →Essay and assignment rewriting for clarity and style
- →Academic citation and reference formatting
- →Long document summarisation for review
- →Professional email and report rewriting
- →ESL English improvement and fluency development
Pricing
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Free : 125 words per paraphrase, 3 Fluency modes, basic grammar check
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Premium : $4.17/month — unlimited words, all 8 modes, Co-Writer and Summarizer
Pricing details may not be up to date. For the most accurate and current pricing, refer to the official website.
What Makes QuillBot Unique?
QuillBot's synonym slider with colour-coded change highlighting gives writers transparent control over exactly how much their original text has been altered — a level of explainability no competitor provides.
How We Rated It
Evaluated on paraphrase quality across 8 modes, mode differentiation clarity, grammar correction precision, citation format accuracy and free tier capabilities versus competitors.
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Accuracy and Reliability 4.3/5
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Ease of Use 4.8/5
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Functionality and Features 4.3/5
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Performance and Speed 4.4/5
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Customer Support 4.2/5
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Value for Money 4.9/5
AI summary
QuillBot is the most versatile paraphrasing tool — 8 rewrite modes, a synonym slider and a complete academic writing suite trusted by 35 million users.