What is QuillBot?

QuillBot is an AI-powered writing assistant built around paraphrasing and text transformation rather than the grammar-first approach taken by tools like Grammarly. Founded in 2017 and acquired by Learneo (the parent company of Course Hero) in 2022, QuillBot has grown to over 75 million registered users and processes more than 100 million paraphrasing queries per month. The platform offers 10 distinct rewriting modes — from Academic and Formal to the newer Boomer mode for converting casual language into professional register — alongside a grammar checker, summarizer, citation generator, AI detector, and AI humanizer. It runs as a web app, browser extension, macOS desktop app, and integrates directly into Google Docs and Microsoft Word.

Key Takeaways

• AI writing assistant focused on paraphrasing with 10 rewriting modes for different contexts — academic, formal, creative, and more
• Free tier available but restrictive for daily professional use; Premium starts at $99.95/year after a significant price increase in late 2025
• Roughly 70% of users are students and academics, with heavy adoption among non-native English speakers
• Includes an AI Humanizer that rewrites AI-generated text to reduce detection signals — a controversial but fast-growing feature
• Owned by Learneo alongside Course Hero, Scribbr, and LanguageTool, signaling a product roadmap oriented toward education over enterprise

Core Features and What Sets QuillBot Apart

QuillBot's flagship feature is its Paraphraser, which rewrites text while preserving meaning across 10 modes. Standard and Fluency handle everyday rewrites, Academic and Formal target research papers and business communication, Creative offers looser interpretations, and Expand and Shorten adjust length. The Boomer mode, added in late 2025, translates informal Gen Z phrasing into professional language — a niche but popular addition.

Beyond paraphrasing, the Grammar Checker flags stylistic issues and tone mismatches and works without sign-up, making it a common entry point. The Summarizer condenses articles and PDFs, with a Custom Mode that lets users specify output format and focus areas. The Citation Generator supports MLA, APA, Chicago, and other formats, directly serving the academic audience that drives most of the platform's traffic. The AI Detector and AI Humanizer round out the toolkit — one identifies AI-generated text, the other rewrites it to reduce detection signals.

The AI Humanizer and the Detection Arms Race

QuillBot's AI Humanizer has become one of its fastest-growing features, and it represents a calculated product bet. The tool rewrites AI-generated text so it reads as more human, reducing the likelihood of being flagged by detectors like Turnitin, GPTZero, or Originality.ai. Its prominence on QuillBot's feature page signals that the company views helping users evade detection as a larger market opportunity than helping institutions detect AI use.

This creates a genuine arms race. Detection tools update their models to catch rewritten AI text, and QuillBot refines its humanizer in response. For anyone using the tool in academic or publishing contexts, the practical implication is that neither side has a stable advantage — text that passes detection today may not pass tomorrow. Turnitin can also detect paraphrasing patterns and stylistic inconsistencies introduced by AI rewriting, meaning even originally written work passed through the paraphraser can trigger plagiarism flags. Heavy reliance on any single rewriting tool carries real risk.

QuillBot vs Grammarly vs Wordtune

Grammarly is the dominant AI writing assistant, with stronger grammar correction accuracy, a more mature enterprise product, and broader integrations across platforms. Grammarly Premium runs about $144/year and focuses on correctness, clarity, and tone — it is the better fit when the goal is polishing original writing. QuillBot's strength is text transformation: rewriting existing content, matching a specific register, or condensing material. They overlap but serve different primary workflows.

Wordtune is QuillBot's most direct competitor, focused on sentence-level rewriting with tone adjustment and length control. Wordtune's output is generally considered more natural-sounding for native English writers, but it lacks QuillBot's academic tooling — no citation generator, no summarizer with custom modes, and no AI detector. For the student and ESL audience that makes up QuillBot's core user base, that academic stack is the deciding factor.

ProWritingAid appeals to long-form writers and authors with deep style analysis and genre-specific suggestions. It is stronger for developmental editing feedback but less capable at paraphrasing.

Pricing After the 2025 Increase

QuillBot roughly doubled its pricing in October 2025. The Monthly plan is now $19.95/month (up from $9.95). The Annual plan runs $99.95/year, equivalent to $8.33/month billed annually (up from $49.95/year). A Student Annual plan is available at $74.95/year — a 25% discount for verifiable students with the same Premium features. The Teams plan starts at $7.50/user/month with centralized billing, shared style guides, and admin controls.

A Free tier still exists with word limits on paraphrasing, limited mode access, and restricted summarizer length. It is functional enough to evaluate the tool but too restrictive for daily professional use. Even after the price increase, QuillBot undercuts Grammarly Premium by roughly 30%, though the gap is no longer the decisive budget advantage it once was. Many reviews written before mid-2025 cite outdated pricing — something worth noting when evaluating the tool against alternatives.

QuillBot for Content Teams and Freelancers

QuillBot's core user base is students and academics — roughly 70% of users fall into this cohort, concentrated in the US, India, Germany, and the Philippines. Non-native English speakers are particularly heavy users because the tool smooths grammatical roughness and helps match expected register in formal writing. Content marketers and SEO writers use it to refresh or rework existing articles at volume, though the output quality varies by mode — Standard and Fluency modes can produce grammatically correct but generic prose, and the tool struggles with technical or domain-specific language where precision matters.

A growing segment is enterprise teams using the Teams plan and its Style Guide feature, which lets organizations define vocabulary rules, tone preferences, and banned phrases enforced across all members' writing. For content operations at scale, this is a meaningful differentiator. On Pangea, we see QuillBot proficiency show up less as an explicit job requirement and more as part of a broader "familiar with AI writing tools" expectation in content writing, academic editing, and ESL instruction roles. For freelance writers, knowing QuillBot's limitations — particularly around mode selection and output quality for technical content — is increasingly a differentiator in client pitches.

The Bottom Line

QuillBot occupies a specific niche in the AI writing landscape: it is the strongest tool available for paraphrasing and text transformation, with deep academic features that justify its dominance among students and non-native English speakers. The 2025 price increase narrowed its cost advantage over Grammarly, and its parent company's education-focused portfolio suggests the product roadmap will continue serving academic workflows over enterprise content teams. For hiring managers evaluating content talent through Pangea, QuillBot fluency signals someone comfortable with AI-assisted rewriting workflows — a practical skill as AI writing tools become standard in content operations.