QuillBot
A widely-used AI paraphrasing and writing toolkit covering rewriting, summarization, grammar checking, plagiarism detection, and citation generation, used by 35+ million students, writers, and professionals.
Overview
QuillBot is an AI-powered paraphrasing and writing platform with over 35 million registered users across education, professional writing, and content creation. Unlike general-purpose AI chatbots that generate text from prompts, QuillBot is built around refining existing text, combining paraphrasing, summarization, grammar checking, plagiarism detection, AI humanizing, and citation generation in a single toolkit. Where tools like Grammarly focus primarily on grammar correction and ChatGPT on text generation, QuillBot’s core differentiator is its multi-mode paraphrasing engine and the breadth of writing support tools bundled at a single price.
Core Features
Intelligent Paraphraser (10+ Modes)
Rewrite text with precision across ten preset modes, Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten, Custom, and the new Boomer Mode (converts Gen Z slang to professional language). Each mode applies different linguistic strategies, from conservative synonym replacement to complete sentence restructuring, while preserving original meaning. A Synonym Slider gives additional granular control over rewriting intensity.
AI-Powered Summarizer
Condense articles, papers, reports, and documents into key bullet points or concise paragraphs. The free tier supports up to 2,500 words; Premium extends this to 6,000 words. Choose between paragraph mode for narrative summaries or bullet mode for structured extraction, ideal for research and quick comprehension.
Grammar Checker & Proofreader
Real-time grammar, spelling, and punctuation correction with contextual suggestions. Goes beyond basic spell-check to catch subject-verb agreement errors, misplaced modifiers, and stylistic inconsistencies, with explanations for every correction. Supports English dialects: American, British, Canadian, and Australian.
Plagiarism Checker
Scan documents against billions of web pages, academic papers, and publications to detect unoriginal content. Premium users get up to 25,000 words per month of plagiarism checking, with detailed similarity reports, percentage scores, highlighted passages, and source links to ensure academic integrity and content originality.
Citation Generator
Automatically generate properly formatted citations in over 1,000 academic styles including APA, MLA, Chicago, Harvard, and more. Supports books, journals, websites, and multimedia sources. Create entire bibliographies with a single click, saving hours of manual formatting work.
Co-Writer & Research Tools
An all-in-one writing environment with built-in research, outlining, and note-taking. Access web search, source summarization, and structured outlining directly alongside your draft, eliminating tab-switching during research-heavy writing projects.
AI Humanizer & AI Detector
Convert AI-generated text into natural, human-sounding prose with the AI Humanizer. The companion AI Detector analyses text to indicate how much of it appears AI-generated or AI-refined, useful for students, editors, and content teams ensuring authenticity before submission.
Use Cases
Academic Writing & Research
Paraphrase source material to avoid plagiarism, summarize research papers, check grammar in essays, and generate citations across 1,000+ styles. Suited to students working on theses, dissertations, and research articles, particularly where proper citation formatting and paraphrasing from sources are a regular part of the workflow.
Content Repurposing & SEO
Refresh existing blog posts, product descriptions, and landing pages with new phrasing while preserving SEO value. Generate multiple variations of the same content for A/B testing and multichannel distribution without duplicate content penalties.
Professional Communication
Refine business emails, reports, proposals, and presentations for clarity and professionalism. Transform casual drafts into formal communications, simplify complex technical language, and ensure error-free correspondence in American, British, Canadian, or Australian English.
Language Learning & ESL
Improve English writing skills by comparing original text with paraphrased alternatives. Supports paraphrasing in 23 languages and translation across 50+ languages. The grammar checker provides explanations that function as micro-lessons for non-native speakers.
Pricing
- 125 words per paraphrase (unlimited uses)
- Standard & Fluency modes only
- 3 synonym options
- 2,500 words in Summarizer
- Basic grammar checking
- No plagiarism checker
- Unlimited words in Paraphraser
- All 10+ paraphrasing modes
- 4 synonym options
- 6,000 words in Summarizer
- Advanced grammar rewrites
- Plagiarism checker (25,000 words/month)
- AI Humanizer & AI Detector
- Citation generator (1,000+ styles)
- All Premium features
- Unlimited paraphrasing
- 10+ paraphrasing modes
- Plagiarism checker (25,000 words/month)
- AI Humanizer & AI Detector
- No annual commitment
Why Choose QuillBot?
QuillBot is built around a different use case than most AI writing tools. Where tools like ChatGPT or Gemini generate new text from prompts, and Grammarly focuses on grammar correction, QuillBot’s focus is transforming and refining text that already exists. That specialisation shapes what it does well, and where it has limits.
More Paraphrasing Modes Than Most Alternatives
With 10+ preset modes – including Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten, Custom, and Boomer Mode – QuillBot gives more granular control over rewriting style than tools like Wordtune or Grammarly’s rewrite feature. The Synonym Slider adds further control over how aggressively the text is changed.
Multiple Writing Tools Under One Subscription
A single QuillBot Premium plan includes the paraphraser, summarizer, grammar checker, plagiarism detector, AI humanizer, AI detector, citation generator, and co-writer. Grammarly and Wordtune, by comparison, do not bundle plagiarism checking or citation generation in their individual plans.
Works Inside the Apps You Already Use
Native extensions for Chrome, Microsoft Word, and Google Docs let you paraphrase and check grammar without leaving your document. iOS and Android apps bring the same tools to mobile. This contrasts with tools like ProWritingAid, which is primarily web-based with limited native app support.
Academic Integrity Tools Bundled In
Premium includes plagiarism checking (up to 25,000 words/month) and a citation generator covering 1,000+ styles, features that competing tools like Wordtune and Grammarly do not include at equivalent price points. This makes QuillBot a more self-contained option for academic writing workflows.
Product Details
Pros
- Purpose-built paraphrasing engine with 10+ modes
- More rewriting modes than Grammarly or Wordtune
- AI Humanizer and AI Detector built-in
- Browser, Word & mobile integration available
- Plagiarism checker + citations bundled in Premium
- Lower annual price than Grammarly ($8.33 vs $12/mo)
- Student discount (25% off annual plan)
Cons
- Free tier very limited (125 words)
- Not a content generator from scratch
- Monthly plan ($19.95) is expensive vs annual
- Occasional awkward phrasing in Creative mode
- Grammar depth less advanced than Grammarly