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QuillBot is an AI writing platform offering paraphrasing, grammar checking, plagiarism detection, AI detection, humanization, summarization, and citation tools. Used by 35M+ writers, it spans students, professionals, and content creators through browser extensions and desktop/mobile apps.
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Annual plan is the clear value tier. Free tier remains usable for light paraphrasing (125 words, 2 modes). Promotional first-year rates occasionally appear on site. Premium unlocks unlimited paraphrasing, all modes, and full Humanizer.
In-depth description and capability notes.
Paraphraser with 9+ modes and unlimited custom modes on Premium Grammar checker across 6 languages Plagiarism checker (25,000 words/month on Premium) AI Detector and Humanizer with tone insights Summarizer up to 6,000 words on Premium Flow document editor with AI chat and image generation Chrome, Edge, Word, macOS, iOS, and Android integrations
Students and professionals rewrite drafts, check grammar, detect AI-generated text, and ensure originality before submitting academic papers, blog posts, or business documents.