QuillBot Review, Pricing & Alternatives (2026)

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 does not identify one foundation model for every product function. Its AI Detector page says the detector is updated as language models evolve and is designed to analyze text associated with systems including GPT, Claude, Gemini, Llama, and other large language models. The detector requires at least 80 words, gives a score from 0 to 100 percent, and presents results as probability estimates rather than verdicts. QuillBot’s current navigation and changelog list Paraphraser, Grammar Checker, AI Detector, Plagiarism Checker, AI Humanizer, AI Chat, AI Image Generator, Translate, Summarizer, and Citation Generator. The detector page also warns that formulaic writing and heavily paraphrased or lightly AI-edited text can affect results, so scores should not determine academic or employment decisions.

QuillBot offers free access alongside Premium subscriptions. The published pricing FAQ lists a monthly plan at $19.95, a plan billed every three months at $39.95, and an annual plan billed every twelve months at $99.95. The annual subscription is described as $8.33 monthly when billed annually, while the quarterly figure is described as $13.31 monthly. Free users receive limited paraphrasing and grammar access, while several other tools have free availability with tool-specific limits. Premium includes expanded modes and inputs, broader plagiarism and detector features, and use on up to 10 devices. The Premium page says usage limits may vary by surface. QuillBot also offers Team access, but does not publish a Team price.

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.