Last updated: 2026-07-01
QuillBot is an AI ai writing assistant by QuillBot Inc. that ai writing tools for paraphrasing, grammar checking, summarizing, plagiarism det.
About QuillBot
QuillBot is a writing toolkit used by 35M+ people. The core tool is a paraphraser with 10+ modes — Standard, Fluency, Formal, Simple, Creative, and others — that rewrites text while preserving meaning. It also includes a grammar checker, summarizer, plagiarism detector, AI detector, and citation generator. More recently, QuillBot added AI Chat, an AI Image Generator, an AI Humanizer for rewriting AI-generated content, and a presentation builder. It supports paraphrasing in 23 languages. Browser extensions work in Chrome, Edge, and Safari; desktop apps integrate directly with Microsoft Word. It's widely used by students, ESL writers, content marketers, and researchers. Over 140 academic institutions have adopted it. The free plan covers basic paraphrasing with word limits; Premium unlocks all modes, unlimited use, and the full toolkit.
Pricing
Free tier with unlimited basic paraphrasing (125 words per use) and core tools. Premium at $19.95/month, $39.95 quarterly ($13.31/mo), or $99.95 annually ($8.33/mo). Student plan $6.25/month with .edu verification. Team plans start at $7.50/user/month with volume discounts.
Feature Comparison by Tier
| Feature | Free | Premium Annual | Premium Monthly | Premium Quarterly |
|---|---|---|---|---|
| Paraphrasing | Limited (125 words/use) | Unlimited | Unlimited | Unlimited |
| Paraphrasing Modes | Standard Only | All 10+ Modes | All 10+ Modes | All 10+ Modes |
| Grammar Checker | Basic | Advanced | Advanced | Advanced |
| Plagiarism Detection | — | 25,000 words/month | 25,000 words/month | 25,000 words/month |
| AI Detection & Humanizer | — | ? | ? | ? |
| AI Chat & Image Gen | — | ? | ? | ? |
| Multiple Language Support (23) | ? | ? | ? | ? |
| Browser Extensions | ? | ? | ? | ? |
Key Features
- Advanced Paraphraser: 10+ writing modes (Standard, Fluency, Formal, Creative, Academic, Simple, Expand, Shorten, Custom) with unlimited paraphrasing at premium tier and adjustable synonym strength
- Comprehensive Grammar Checker: Real-time detection and correction of grammar, spelling, punctuation, and style issues with explanations and examples
- Plagiarism Detection: Scans content against online sources to detect plagiarism and ensure originality up to 25,000 words per month for premium users
- AI Detection & Humanization: Identifies AI-generated text and humanizes it to sound more natural and human-like while preserving meaning
- AI Chat & Content Generation: Conversational AI assistant for brainstorming, writing, research, and image generation with real-time web search and citations
- Multi-Platform Integration: Native extensions for Chrome, Edge, Safari, Firefox, Word add-in, and desktop apps for Windows and macOS, plus iOS and Android keyboard apps
Pros
- Superior paraphrasing with 10+ modes offering versatility across writing styles and tones
- Affordable pricing at $8.33/month annually, significantly cheaper than Grammarly
- Extensive platform compatibility with browser extensions and native desktop/mobile apps
- All-in-one solution combining paraphrasing, grammar checking, plagiarism detection, and AI content creation
- Powerful free tier with legitimate features accessible without payment
Cons
- Free tier limited to 125 words per paraphrase, requiring frequent switching for longer documents
- AI Humanizer only 40-60% effective at bypassing AI detectors in real-world testing
- Grammar checking less advanced than specialized tools like Grammarly for complex analysis
- Occasional inconsistency with AI detection results and false positives on human-written text
- Limited context understanding for highly technical or specialized content
Product Information
- Cloud
- Yes
- Self-Hosted
- No
- On-Premise
- No
- Languages
- English, Spanish, French, German, Italian, Portuguese, Dutch, Russian, Chinese, Japanese, Korean, Arabic, Bengali, Hindi, Thai, Turkish, Vietnamese, Polish, Swedish, Norwegian, Danish, Finnish, Ukrainian
- Training
- Documentation, Video Tutorials, Browser Extension Guides, Help Center Articles, Email Support
Frequently Asked Questions
What is QuillBot?
QuillBot is a writing toolkit used by 35M+ people, centered on a paraphraser with 10+ modes — Standard, Fluency, Formal, Simple, Creative, and others — that rewrites text while preserving meaning. It also includes a grammar checker, summarizer, plagiarism detector, AI detector, and citation generator.
How much does QuillBot cost?
QuillBot offers a free plan covering basic paraphrasing with word limits per rewrite. Premium unlocks all 10+ paraphrasing modes, unlimited word counts, and the full toolkit including AI detector, AI Humanizer, and presentation builder, with monthly and annual pricing options.
What are the main features of QuillBot?
Key features include 10+ paraphrasing modes supporting 23 languages, a grammar checker, summarizer, plagiarism detector, AI detector, citation generator, AI Chat, an AI Image Generator, an AI Humanizer for rewriting AI-generated content, and a presentation builder. Browser extensions work in Chrome, Edge, and Safari, with desktop integration for Microsoft Word.
Is QuillBot free to use?
Yes, QuillBot's free plan covers basic paraphrasing with per-rewrite word limits. Premium removes word limits and unlocks all 10+ modes plus the full toolkit (grammar, summarizer, plagiarism detector, AI detector).
Who is QuillBot best for?
QuillBot is best for students, ESL writers, content marketers, and researchers who need to paraphrase, check grammar, and verify originality — over 140 academic institutions have adopted it. Users primarily needing tone/clarity suggestions across many apps may prefer Grammarly.
How does QuillBot compare to Grammarly?
QuillBot's core strength is paraphrasing with 10+ distinct rewriting modes across 23 languages plus an AI Humanizer and AI detector, while Grammarly focuses on grammar, spelling, and tone correction integrated across 1 million+ apps. Many users use both tools for complementary purposes.
Does QuillBot support multiple languages?
Yes, QuillBot supports paraphrasing in 23 languages, with browser extensions for Chrome, Edge, and Safari and a desktop app that integrates directly with Microsoft Word.
Is QuillBot used in academic settings?
Yes, over 140 academic institutions have adopted QuillBot, primarily for its grammar checker, plagiarism detector, citation generator, and paraphrasing tools used by students and researchers.
Top Alternatives
- Grammarly: Pick Grammarly if you need tone and clarity feedback across 1M+ apps; pick QuillBot if you want 10+ paraphrasing modes at half the cost.
- Language Tool: Pick Language Tool if you need free, open-source grammar checking; pick QuillBot if you want paraphrasing plus all-in-one writing features.
- Copy.ai: Pick Copy.ai for bulk AI content generation; pick QuillBot if you need paraphrasing, grammar, and plagiarism detection in one platform.