QuillBot

QuillBot Premium costs $99.95/year ($8.33/month, best value), $79.90 every 6 months ($13.31/month), or $19.95/month. Team Plans start at $7.50/user/month for 2-10 users with volume discounts available. All plans come with a 3-day money-back guarantee for first-time users. The annual plan saves 58% compared to monthly billing and costs 31% less than Grammarly's $144/year.

Yes, QuillBot offers a free plan with access to all core tools including Paraphraser (125 words per use, unlimited uses), Grammar Checker, AI Detector, Summarizer (1,200 words), Citation Generator, and Translator. Free users get 2 paraphrasing modes (Standard and Fluency) plus 50 AI prompts daily. However, the 125-word limit per use makes the free plan essentially a trial—long documents require Premium ($8.33/month annually) for practical use.

No. Independent testing in 2025 shows QuillBot's Humanizer only reduces AI detection scores by 40-60% in best-case scenarios. Major AI detectors like Originality.ai still flag content as 96% AI-generated after humanization, and GPTZero detects it as fully AI. The Humanizer works well for improving tone, fluency, and readability of AI-assisted content, but should not be relied upon to bypass AI detection systems in academic or professional contexts where detection matters.

QuillBot excels at paraphrasing with 10 distinct modes and offers better academic tools (citations, plagiarism checking, AI detection, summarizer) at 31% lower cost ($99.95/year vs Grammarly's $144/year). QuillBot also supports 23 languages for paraphrasing while Grammarly is English-only. However, Grammarly provides superior grammar analysis, clearer explanations, better tone detection, and more sophisticated style suggestions. Choose QuillBot for paraphrasing and academic work; choose Grammarly for grammar perfection and professional writing. Many users use both tools together.

QuillBot's Paraphraser supports 23 languages (Afrikaans, Chinese, Danish, Dutch, English, French, German, Hindi, Indonesian, Italian, Japanese, Malay, Norwegian, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Tagalog, Turkish, Ukrainian, Vietnamese). The Translator covers 50 languages with instant translation. The Grammar Checker works in 6 languages: English (with American, British, Canadian, Australian dialects), German, Spanish, and French. The AI Detector supports 6 languages: English, French, Spanish, German, Dutch, and Portuguese.

Using QuillBot is not inherently plagiarism or cheating—it depends on how you use it. Ethical use includes paraphrasing your own original ideas for clarity, improving grammar and fluency of your own writing, and reorganizing your own written content. Unethical use (academic misconduct) includes paraphrasing someone else's work without proper citation, using it to disguise copied content from sources, or submitting paraphrased text without understanding the material. Always cite sources properly even when paraphrasing, and ensure the final work reflects your own understanding. Most universities' plagiarism policies focus on whether ideas are properly attributed, not which tools were used to refine your writing.

Yes, Turnitin can now detect QuillBot paraphrasing as of 2025. Turnitin's updated algorithms identify unique linguistic patterns and structural similarities typical of AI-assisted paraphrasing, even when words are changed. While QuillBot's paraphrasing can reduce direct text matches, Turnitin's AI detection focuses on writing patterns, sentence structures, and stylistic inconsistencies that may indicate machine-assisted rewriting. However, if you're paraphrasing your own original work to improve clarity and properly citing all external sources, using QuillBot remains acceptable in most academic contexts. Earlier claims that "Turnitin cannot detect QuillBot" (from 2024 sources) are now outdated—detection technology has significantly improved.

Yes, QuillBot offers extensions for both platforms. The Chrome extension works seamlessly with Google Docs, allowing real-time paraphrasing and grammar checking. The Microsoft Word add-in (compatible with Word Online, Word 2013+ Windows, Word 2016+ Mac) provides similar functionality. However, some users report performance issues with the Word add-in including bugs, slowness, and occasional crashes. The browser extension (trusted by 5+ million users) works reliably across 500,000+ websites including Gmail, LinkedIn, Outlook, and Slack. For critical work, the web version at quillbot.com provides the most stable experience.

QuillBot's AI Detector achieves approximately 80% accuracy according to independent testing in 2025. It analyzes patterns like perplexity (predictability), burstiness (sentence length variation), repetitive phrasing, and generic language typical of AI models. Best performance occurs with standard AI-generated content from ChatGPT, GPT-4, and Google Gemini. However, it struggles with highly sophisticated or manually edited AI content and can occasionally flag formal academic writing as AI-generated (false positives). The detector requires minimum 80 words for accurate analysis and works best with complete documents. For high-stakes verification (academic integrity, publishing), cross-reference results with specialized detectors like Originality.ai or GPTZero for confirmation.

QuillBot Premium includes a Plagiarism Checker that scans text against billions of web pages and academic databases. Premium users receive 25,000 words of plagiarism checking per month (QuillBot switched from page-based to word-based counting for accuracy). The checker works in 100+ languages and provides detailed reports showing matched content sources, similarity percentages, and citations. Additional plagiarism checking credits can be purchased if you exceed the monthly limit. The free plan does not include plagiarism checking. Important note: QuillBot's plagiarism checker is less robust than institutional tools like Turnitin—use it as preliminary screening, not final verification for formal academic submissions.

QuillBot offers a 3-day money-back guarantee (not 7 days as some outdated sources claim). If you purchase QuillBot Premium and are unsatisfied, you can request a full refund within 3 days of purchase. Important conditions: This guarantee is only valid for first-time users who have never received a QuillBot refund before. Team Plan purchases do not qualify for refunds. You must request the refund within the 3-day window. To request a refund, cancel your subscription in your Account page within the 3-day window or contact QuillBot support directly at support@quillbot.com. Refunds are typically processed within 7-10 business days.