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QuillBot is an AI paraphrasing platform that rewrites sentences and paragraphs across 10+ tone-based modes. This review tests its Standard, Fluency, Formal, and Academic modes for accuracy, meaning retention, and output quality against its $8.33/month Premium tier.
What Is QuillBot?
QuillBot is an AI-powered paraphrasing and writing platform, built by Learneo Inc., that rewrites text across 10+ modes while checking grammar, summarizing content, detecting plagiarism, and generating citations for students, professionals, and content teams.
QuillBot launched in 2017 when three computer science students at the University of Illinois Urbana-Champaign — Rohan Gupta, David Silin, and Anil Jason — built a paraphrasing tool and posted it to Reddit for early feedback. Course Hero (now operating as Learneo Inc.) acquired QuillBot in August 2021, folding it into a portfolio that includes CliffsNotes, Symbolab, and LitCharts. According to Learneo’s official team page, QuillBot now serves over 30 million monthly active users. The platform’s paraphrasing engine uses transformer-based natural language processing to restructure sentences, swap vocabulary, and adjust tone while preserving the source meaning.
| Attribute | Value |
| Developer / Parent Company | QuillBot LLC, owned by Learneo Inc. (formerly Course Hero), which acquired QuillBot in August 2021 |
| Founded | 2017, by Rohan Gupta, David Silin, and Anil Jason at the University of Illinois Urbana-Champaign |
| Headquarters | Chicago, Illinois |
| Core Function | AI-powered paraphrasing, with grammar checking, summarizing, plagiarism detection, AI detection, translation, and citation generation |
| Monthly Active Users | Over 30 million, per Learneo’s official team page |
| Free Plan Word Limit | 125 words per paraphrase, unlimited daily uses |
| Free Plan Modes | 2 (Standard, Fluency) |
| Premium Plan Modes | 10+ predefined modes plus unlimited Custom modes |
| Premium Pricing | $8.33/month billed annually at $99.95/year |
| Platforms | Web app, Chrome/Edge extension, Microsoft Word add-in, Google Docs integration, macOS and Windows apps |
What Are QuillBot’s Key Features?
QuillBot’s core feature set includes a 10-mode Paraphraser, a grammar checker, a Summarizer, a plagiarism detector, an AI content detector, a citation generator, and a Co-Writer workspace that combines these tools into a single editing session.
- Paraphrase text across 10+ modes, including Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten, and Humanize, plus unlimited Custom modes on Premium.
- Adjust output intensity with the Synonym Slider, which scales rewrites from minimal word substitution to heavy vocabulary and structure changes.
- Check grammar and punctuation errors across the full text, not just the paraphrased selection.
- Summarize documents up to 6,000 words on Premium (1,200 words on the free plan) into key-point or paragraph-style summaries.
- Scan submissions against online sources with the Plagiarism Checker, capped at 25,000 words per month on Premium.
- Detect AI-generated text with the built-in AI Detector before publishing or submitting content.
- Generate citations in APA, MLA, Chicago, and other academic formats through the Citation Generator.
- Translate and paraphrase text in 23 supported languages.
- Integrate directly with Google Docs, Microsoft Word, and Chrome-based apps including Gmail and Slack through the browser extension.
How Much Does QuillBot Cost?
QuillBot Premium costs $19.95/month billed monthly, $13.31/month billed semi-annually ($79.95 every six months), or $8.33/month billed annually at $99.95/year, according to QuillBot’s official pricing page. The Free plan costs $0.
| Plan | Billing | Monthly Cost | Total Billed |
| Free | N/A | $0 | $0 |
| Premium Monthly | Monthly | $19.95 | $19.95/month |
| Premium Semi-Annual | Every 6 months | $13.31 | $79.95/6 months |
| Premium Annual | Yearly | $8.33 | $99.95/year |
Premium unlocks unlimited paraphrase input length, all 10+ modes plus Custom modes, the full plagiarism checker allotment, and the extended 6,000-word Summarizer limit. The Free plan restricts paraphrasing to 125 words per submission and limits mode access to Standard and Fluency, though it allows unlimited daily paraphrase attempts within that word cap. QuillBot also offers a discounted Student plan and does not publish a standard free-trial period for Premium; the Free plan functions as an ongoing trial of the core paraphrasing engine instead.
What Are the Pros and Cons of QuillBot?
Pros
- Prices Premium Annual at $8.33/month, undercutting Grammarly’s $12/month annual rate by 31%.
- Offers 10+ distinct paraphrasing modes versus the 2-mode free tier most competitors provide.
- Requires no account creation to run a basic paraphrase on the free tool.
- Integrates directly into Google Docs and Microsoft Word without a separate export step.
- Includes a citation generator and academic-mode paraphrasing built specifically for research writing.
Cons
- Caps free-tier paraphrasing at 125 words, forcing longer documents into multiple manual passes.
- Excludes the plagiarism checker entirely from the Free plan.
- Shifts meaning or terminology at higher Synonym Slider settings, particularly in technical or domain-specific text.
- Limits the Plagiarism Checker to 25,000 words per month even on Premium, a ceiling reached within 2-3 long-form articles.
- Strips original formatting (bold, italics, headings) from any text pasted into the input box.
How Does QuillBot Compare to Grammarly?
QuillBot leads on paraphrasing depth with 10+ tone-based rewriting modes at $8.33/month, while Grammarly leads on grammar and clarity correction at $12/month with stronger sentence-level proofreading built around editing rather than rewriting.
| Attribute | QuillBot | Grammarly |
| Core Strength | Paraphrasing across 10+ tone-based modes | Grammar, clarity, and tone correction |
| Entry-Level Price | Free (125 words/paraphrase) | Free (limited suggestions) |
| Premium Price | $8.33/month (annual billing) | $12/month (annual billing) |
| Paraphrasing Modes | 10+ modes plus unlimited Custom modes | Rewrite suggestions, not a dedicated multi-mode paraphraser |
| Plagiarism Checker | Included on Premium, 25,000 words/month | Included on Business plans only |
| Best Use Case | Rewriting and rephrasing existing drafts | Proofreading and grammar-first editing |
QuillBot’s Paraphraser rewrites full sentences and paragraphs into a different structure, which makes it the stronger choice for reducing repetition across drafts or adapting one piece of writing into multiple versions. Grammarly’s engine instead flags and corrects errors in place, which makes it the stronger choice for polishing a near-final draft without changing its structure. For a full side-by-side breakdown, see the dedicated comparison post, QuillBot vs Grammarly: Which AI Writing Tool Wins in 2026.
Who Should Use QuillBot?
QuillBot suits students rewriting research drafts, non-native English writers adjusting tone and fluency, content marketers repurposing articles, and SEO teams reformulating wire-service or licensed copy into editorially distinct text.
- Students and academic writers who need Academic-mode paraphrasing plus a built-in citation generator for research papers.
- Non-native English speakers and English Language Learners who use Fluency mode to correct grammar and improve sentence flow.
- Content marketers and SEO writers who repurpose one article into multiple platform-specific versions using Creative and Formal modes.
- Small newsrooms and digital publishers who rewrite licensed wire content into editorially distinct copy to avoid duplicate-content penalties.
- Business professionals who draft emails, reports, and proposals and need a fast Formal-mode pass before sending.
What Are the Best Alternatives to QuillBot?
The three strongest QuillBot alternatives are Grammarly for grammar-first editing, Wordtune for AI-assisted rewriting with a conversational tone, and ProWritingAid for long-form manuscript analysis and style reports.
- Grammarly ($12/month annual) — a grammar- and clarity-first writing assistant better suited to proofreading a near-final draft than rewriting one from scratch. Read the full Grammarly Review.
- Wordtune ($13.99/month) — an AI rewriting tool built around conversational tone shifts and shorten/expand suggestions at the sentence level. Read the full Wordtune Review.
- ProWritingAid ($10/month annual) — a style- and manuscript-analysis tool aimed at long-form writers who need in-depth reports rather than quick paraphrasing. Read the full ProWritingAid Review.
Frequently Asked Questions
Is QuillBot free to use?
Yes. QuillBot’s Free plan paraphrases up to 125 words per submission in Standard or Fluency mode, with no daily limit on the number of paraphrase attempts and no credit card required.
How many paraphrasing modes does QuillBot Premium include?
QuillBot Premium includes 10+ predefined modes — Standard, Fluency, Formal, Academic, Simple, Creative, Expand, Shorten, and Humanize — plus unlimited Custom modes that Premium users can configure.
Does QuillBot detect AI-generated text?
Yes. QuillBot includes a built-in AI Detector that scans submitted text and flags sections likely generated by AI models, separate from its Plagiarism Checker.
Can QuillBot replace Grammarly?
Partially. QuillBot rewrites and restructures text through its Paraphraser, while Grammarly focuses on in-place grammar and clarity correction; many writers run both tools for different stages of the same document.
QuillBot Premium Annual costs $8.33/month ($99.95/year) and unlocks 10+ paraphrasing modes against a 125-word, 2-mode ceiling on the Free plan — the deciding factor for any writer who needs to rewrite more than a single short paragraph at a time.