Grammarly vs QuillBot: pricing, features and which to choose

Grammarly is a writing-assistance product made by Superhuman, the company formerly known as Grammarly. The company says Grammarly was founded in 2009 and serves more than 40 million people and 50,000 organizations. On October 29, 2025, it announced a name change to Superhuman while retaining Grammarly, Coda, Mail, and Superhuman Go as products in the broader suite. Grammarly therefore remains focused on writing support rather than becoming a separate foundation-model vendor. In May 2025, the company announced $1 billion in growth financing from General Catalyst and said revenue had exceeded $700 million. It also announced Coda’s acquisition in January 2025 and an agreement to acquire Superhuman in July 2025, placing Grammarly inside a larger product family.

Grammarly works inside supported applications, websites, browsers, and documents. A typical session involves writing text, reviewing inline spelling and grammar suggestions, and applying recommendations for tone, clarity, fluency, inclusive language, or citation consistency when the plan supports those capabilities. Pro adds full-sentence rewrites, tone adjustment, plagiarism detection, and AI-generated-text detection. Team features include style guides, brand tones, knowledge sharing, snippets, and analytics, helping organizations make writing more consistent. Grammarly says the product works across more than 1 million applications and websites. Docs provides a dedicated writing space, while newer agents can help users draft, revise, research, and receive audience feedback without opening a separate application. This broad coverage is central to its everyday writing-assistance approach.

The main limitation is the need to allow an AI service into many writing contexts. For individual accounts, Product Improvement and Training is enabled by default, although users can opt out. Microsoft Editor and Copilot fit organizations centered on Microsoft 365, while Google Docs with Gemini fits teams working mainly in Google Workspace. LanguageTool and ProWritingAid focus more narrowly on correction and style assistance. Grammarly is a strong choice for people who want correction, rewriting, tone guidance, detection features, and broad application coverage in one service. However, organizations should review account controls and content policies before using it for confidential work. Users seeking an open-source or self-hosted checker may also find Grammarly unsuitable, since the profile identifies it as neither.

QuillBot is an AI-powered writing companion founded in 2017 by University of Illinois computer science students Rohan Gupta, Anil Jason, and David Silin. Learneo, formerly Course Hero, acquired QuillBot in September 2021, and Gupta leads Learneo’s writing vertical. Learneo’s leadership page describes QuillBot as having more than 30 million monthly active users. The product has grown from its original writing-improvement focus into a suite covering paraphrasing, grammar checking, translation, summarization, citation generation, plagiarism checking, AI detection, AI chat, AI humanization, and image generation. Its core audience includes students, language learners, researchers, professionals, and other writers who want assistance revising or understanding text. It remains a writing service rather than a general-purpose publishing application.

A typical QuillBot workflow begins with text entered or uploaded through its web tools, browser extensions, desktop app, or mobile experience. Users can paraphrase text in more than 10 modes, including Academic and Simple, adjust synonym use, check grammar, summarize documents, translate between languages, or generate citations. The AI Detector analyzes text for patterns associated with AI writing and returns a percentage estimate, while Premium users can download full reports. The service also lists plagiarism checking, AI Humanizer, AI Chat, and AI Image Generator among its tools. These functions operate as connected but distinct writing utilities. Users should review every rewrite for meaning, source accuracy, citation completeness, and appropriate attribution before submitting or publishing the result.

QuillBot’s main caveat is that rewriting can alter nuance, while AI detection cannot establish authorship. Its privacy materials say inputs and usage data may support service improvement and personalization. For browser extensions version 4.37.0 or later, text storage is on by default, with controls to opt out of storage and model training; Team inputs are excluded from training by default. LanguageTool, Grammarly, and Wordtune are direct alternatives for writing assistance, with LanguageTool a close fit for multilingual correction and Grammarly a close fit for broad workplace writing. These are editorial fit comparisons, not claims about identical features. Pick QuillBot if paraphrasing, translation, citations, and study-oriented writing tools matter more than continuous workplace correction.