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.

AI 内容检测工具

QuillBot包含一个抄袭检查工具，可根据网络源和学术数据库扫描书面内容，以识别潜在的重复并确保内容的原创性。该工具用源链接和匹配百分比突出显示匹配的段落，对需要验证其作品唯一性的学生、学术人士和内容创作者非常有价值。

AI 语法检查工具

QuillBot的语法检查工具使用AI实时检测和纠正语法错误、标点符号错误、拼写问题和文体不一致之处。该工具为每项更正提供详细建议和解释，帮助用户不仅能够修复错误，还能理解基础语法规则。

AI 改写工具

QuillBot是最广泛使用的AI改写工具之一，提供七种不同的改写模式，包括标准、流畅、正式、简洁、创意、扩展和缩短。改写工具在保留原意的同时重写文本，使用户能够改写句子和整个文档，以避免重复、提高清晰度或调整语调和风格。

AI 摘要工具

QuillBot的总结工具将冗长的文章、研究论文和文档浓缩为简洁的关键句子或段落摘要。用户可以调整摘要长度，并在提取式摘要（突出最重要的句子）或抽象式摘要（生成捕捉核心思想的新压缩文本）之间进行选择。

AI 写作工具

QuillBot 是一个综合性 AI 写作助手，具有集成的 Co-Writer 工作区，将改写、语法检查、总结和引用生成结合到统一的写作环境中。该平台帮助写手在从初稿到最终修改的每个阶段进行创作，并提供浏览器扩展和文字处理器集成，实现无缝工作流。