QuillBot is an AI-powered writing and paraphrasing platform that helps students, professionals, and content creators improve, rephrase, and refine their written content. Founded in 2017 by Anil Jason, Rohan Gupta, and David Silin, the company was headquartered in Chicago, Illinois, and was acquired by Course Hero in 2023. QuillBot's flagship Paraphraser tool uses advanced natural language processing to rewrite sentences, paragraphs, and entire documents while preserving the original meaning, offering multiple rewriting modes including Standard, Fluency, Formal, Simple, Creative, Expand, and Shorten to match different writing contexts and style preferences. The Grammar Checker analyzes text for grammatical errors, punctuation mistakes, spelling issues, and stylistic improvements, providing real-time suggestions with explanations. QuillBot's Summarizer condenses long texts, articles, and documents into concise summaries in either key sentences or paragraph format, making it useful for research and study workflows. The platform includes a Citation Generator that creates properly formatted citations in APA, MLA, Chicago, and other academic styles from URLs, book titles, or DOIs. QuillBot also offers a Translator that supports over 30 languages, a Plagiarism Checker that scans text against web sources and academic databases, and a Co-Writer that combines all tools into a unified writing workspace. The platform is available as a web application, browser extensions for Chrome and Firefox, desktop applications, and integrations with Microsoft Word and Google Docs. QuillBot operates on a freemium model with a free tier that provides access to basic paraphrasing with word limits and limited mode options. The Premium plan is priced at approximately $9.95 per month and unlocks unlimited paraphrasing, all rewriting modes, advanced grammar checking, increased plagiarism checking, and faster processing. Team plans are available for organizational deployment.
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