# QuillBot

> QuillBot is a paraphrasing and rewriting suite built around a text rewriter with multiple stylistic modes, bundled with a grammar checker, summarizer, plagiarism checker, AI-content detector, an AI humanizer, a citation generator, translation, and a lightweight chat and image generator, delivered through browser extensions, desktop apps, a Microsoft Word add-in, and mobile keyboards; it is free with 125-word limits and $19.95 per month or $99.95 per year for Premium, and it is owned by Learneo, the company formerly known as Course Hero.

- Category: AI Writing & Content Generation (https://saastracker.org/categories/ai-content-writing)
- Website: https://quillbot.com
- Starting price: $0 (Free), then $8.33 per month billed annually ($99.95 per year) for Premium
- Free plan: Free includes paraphrasing up to 125 words in two modes, basic grammar correction, humanizing up to 125 words with six uses a day, 1,200-word summaries, limited AI detector access, 20 chats, 3 images a day, and 10MB of Flow storage.
- Free trial: No time-limited trial; the free tier is permanent and there is a 14-day money-back guarantee on Premium
- Founded: 2017, HQ: Chicago, Illinois, United States, with roots at the University of Illinois, Ownership: Owned by Learneo, Inc., the private company formerly known as Course Hero
- Profile last reviewed: 2026-08-22
- Canonical profile: https://saastracker.org/products/quillbot

## Overview

QuillBot began in 2017 as a paraphrasing tool built by three students at the University of Illinois, and its centre of gravity has never really moved. Everything the product does is a variation on taking text that already exists and producing a different version of it: rewritten in another register, condensed into a summary, translated, checked against sources, or scrubbed until an AI detector stops flagging it. That is a narrower job than most tools in this category, and QuillBot is better at it than the generalists precisely because it never tried to become a content platform.

The product is owned by Learneo, the holding company that was Course Hero until it renamed itself in 2023, and that ownership explains a great deal about who QuillBot is for. The academic market is the core: citation generation, plagiarism checking against academic sources, a summarizer sized for research papers, and 35 million claimed users skewing heavily toward students. Business buyers are a secondary audience served by the same tools, and the marketing language reflects that with talk of clarity, confidence, and integrity rather than pipelines and publishing.

It is also the clearest example in this category of a tool selling both the problem and the solution. QuillBot ships an AI-content detector and, in the same subscription, an AI humanizer whose entire function is to rewrite machine-generated text until that class of detector stops flagging it. The vendor presents both as integrity features. They are not compatible claims. Any buyer evaluating QuillBot should decide up front whether they want a product whose most-marketed capability is defeating a check that the same product sells, and should treat the humanizer's effectiveness claims as unproven, because detector behaviour changes constantly and no vendor can honestly guarantee a pass.

Set that aside and the pricing is genuinely aggressive. Free is a real product with 125-word ceilings on the rewriter and humanizer, two paraphrasing modes, basic grammar correction, and limited detector access. Premium removes the word limits, opens nine paraphrasing modes plus unlimited custom modes, adds 25,000 words a month of plagiarism checking, tone insights, grammar in six languages, translation into more than forty, and faster processing, for $19.95 month to month or $99.95 a year, which works out to $8.33 a month. There is a team plan with usage metrics, a management dashboard, and centralized billing, though its price is not published.

## How it works

1. You paste or type text into the QuillBot web app, or select it inside another application if you have the extension or desktop app installed. The paraphraser rewrites it, and the mode determines how far the rewrite goes: Standard and Fluency are available free, while Premium opens nine modes including Academic, Formal, Simple, Creative, and Shorten, plus unlimited custom modes you define yourself in plain language.

2. A synonym slider controls how aggressively the rewriter substitutes vocabulary, and a comparison view shows several modes side by side so you can pick the version you want rather than accepting the first output. Paraphraser History on Premium keeps what you have already produced, which matters more than it sounds when you are iterating on the same paragraph.

3. The rest of the suite operates on the same text. The grammar checker corrects across six languages on Premium, the summarizer condenses up to 6,000 words into paragraph or bullet form with custom prompts, the translator covers more than forty languages, the citation generator builds formatted references, and the plagiarism checker scans 25,000 words a month against web and academic sources in more than a hundred languages.

4. Then there is the detection pair. The AI detector reports how machine-generated a passage reads. The humanizer rewrites machine-generated text with the explicit goal of getting it past detectors, capped at 125 words and six uses a day on Free and unlimited on Premium, with Humanizer insights and history available only on the paid tier. QuillBot Flow provides a lightweight document workspace with 10MB of storage free and 100MB on Premium, plus a chat assistant and an image generator limited to 3 images a day free and 300 a month on Premium.

## Best for

Students, researchers, non-native English writers, and small-business writers whose recurring task is reshaping existing text rather than producing new articles, particularly anyone who needs paraphrasing, summarizing, translation, and citation work in one cheap subscription that follows them into Word and the browser.

## Not the right fit for

- Anyone who needs to produce long-form original content; QuillBot rewrites and condenses, it does not research, outline, or draft articles from a keyword, and there is no SEO layer of any kind.
- Publishers and marketing teams; there is no CMS publishing, no WordPress or Webflow integration, no brand voice training worth the name, no editorial workflow, and no team seat pricing published anywhere.
- Buyers who object on principle to a product that sells an AI detector and an AI-detector evasion tool in the same subscription, which is a reasonable position to hold.
- Anyone treating the humanizer as a guarantee; detector behaviour changes without notice, no vendor can promise a pass, and building a content operation on evasion is a strategy with an expiry date.
- Teams that need model transparency; QuillBot does not disclose which underlying models power the paraphraser, the chat, or the humanizer, and offers no way to select one.

## Features

### Paraphrasing

The core engine and the only thing QuillBot is unambiguously best at.

- **Multi-mode rewriting**: Standard and Fluency on Free; Premium adds nine modes covering Academic, Formal, Simple, Creative, Expand, and Shorten. The modes produce genuinely different output rather than cosmetic variations.
- **Unlimited custom modes**: Premium lets you define your own rewriting mode in plain language, for example writing as a technical documentation author or a plain-English explainer, and reuse it. This is the closest QuillBot gets to brand voice.
- **Synonym slider**: Controls how far the rewriter departs from your vocabulary. Turning it up increases the odds of an awkward substitution, which is a real failure mode of this class of tool.
- **Mode comparison**: Shows several rewrites side by side so you can choose rather than regenerate.
- **Word limits**: Free caps the paraphraser at 125 words per pass. Premium removes the cap entirely, which is the single biggest practical difference between the tiers.
- **Paraphrasing in 23 languages**: The rewriter itself works across 23 languages on Premium, not just English.
- **Paraphraser history**: Premium-only. Keeps prior rewrites so you can return to a version you discarded.

### Correctness and originality

A competent grammar and plagiarism layer, weaker than Grammarly on breadth.

- **Grammar checker**: Basic correction free, advanced writing suggestions and correction across six languages on Premium. Serviceable, and not as refined as Grammarly's after fifteen years of tuning.
- **Plagiarism checker**: 25,000 words a month on Premium against web and academic sources in more than 100 languages, with missed-citation identification. Free has none.
- **Tone insights**: Premium-only analytics on how a passage is likely to read to its audience.
- **Citation generator**: Formatted references in standard academic styles, a direct inheritance from the product's student user base.

### Detection and humanizing

The most-marketed pair in the product, and the one to think hardest about.

- **AI content detector**: Limited on Free, full access on Premium. Reports how machine-generated a passage reads. Like every detector on the market it produces false positives on human writing and should never be used to make a decision about a person.
- **AI humanizer**: Rewrites machine-generated text with the stated purpose of getting it past AI detectors. Capped at 125 words and six uses a day on Free, unlimited on Premium. QuillBot sells this alongside the detector, which is not a coherent integrity position.
- **Humanizer insights and history**: Premium-only reporting on what the humanizer changed and access to prior passes. Free gets no history and limited insight.
- **No guarantee, and none is possible**: Detector models change without notice. Any claim that humanized text will reliably pass a given detector is unverifiable, and QuillBot does not offer one in contractual terms. Treat evasion as a fragile tactic, not a capability you can plan around.

### Reading, creation, and workspace

The bolted-on parts, all metered tightly on Free.

- **Summarizer**: 1,200 words free, 6,000 on Premium, with paragraph or bullet output and custom summary prompts. Genuinely good on research papers and long reports.
- **Translator**: More than 40 target languages on Premium, integrated with the rewriter so you can translate then paraphrase in one pass.
- **AI chat**: 20 chats free and higher usage on Premium. It exists, it is not why anyone buys QuillBot, and it does not compete with a frontier assistant.
- **AI image generation**: 3 images a day free, 300 a month on Premium. A commodity feature with no editorial value.
- **QuillBot Flow**: A document workspace with 10MB of storage free and 100MB on Premium. Lightweight compared to a real editor and not a CMS in any sense.
- **Faster processing**: Premium unlocks priority processing speed, which is noticeable on long passages.

### Platforms and teams

Good surface coverage, thin team story.

- **Browser extensions**: Chrome, Edge, and Safari, so rewriting works inside web applications without a copy-and-paste loop.
- **Desktop and Word**: macOS and Windows applications plus a Microsoft Word add-in, which covers most document work.
- **Mobile keyboards**: Android and iOS keyboards and apps apply the paraphraser to phone typing.
- **Team plan**: Adds team usage metrics, a user management dashboard, centralized billing, data controls, and priority assistance. The price is not published, which is the one place QuillBot stops being transparent.

## Use cases

- **Non-native English speaker writing business documents**: The draft is technically correct but reads stiffly, and a full rewrite by hand takes longer than writing it did. Outcome: The Fluency and Formal modes produce a natural-sounding version in one pass, the grammar checker handles the residue, and the whole thing costs $8.33 a month on annual billing.
- **Researcher condensing a literature pile**: Forty papers to get through, notes needed on each, and citations to assemble afterwards. Outcome: The 6,000-word summarizer produces bullet summaries per paper, the citation generator assembles the references, and the plagiarism checker verifies the write-up before submission. This is QuillBot's home turf.
- **Small agency repurposing one asset into several**: A single long-form piece needs to become a newsletter, a LinkedIn post, and a shortened landing-page section without three separate writing sessions. Outcome: Custom modes let the agency define a house register once and apply it, and the Shorten and Expand modes handle length changes. It is faster than drafting from scratch and worse than a frontier assistant given a good prompt.
- **Marketer who wants machine-written copy to read as human**: Drafts come out of a chat assistant sounding like drafts out of a chat assistant, and someone on the team is worried about detection. Outcome: The humanizer will change the surface texture, and it may or may not defeat whichever detector is being used this quarter. The better outcome is a real edit by a human, and this is the case where QuillBot is solving the wrong problem.

## Pricing

Freemium individual subscription with monthly, quarterly, and annual billing on one paid tier, plus an unpriced team plan.

- **Free**: $0 per month. Paraphrase up to 125 words in Standard and Fluency modes; Basic grammar correction; Humanize up to 125 words, 6 uses per day; Summaries up to 1,200 words; Limited AI detector, 20 chats, 3 images per day; 10MB of QuillBot Flow storage. The 125-word ceilings are the constraint. Everything else is present in reduced form.
- **Premium**: $19.95 per month billed monthly. Unlimited paraphrasing across 9 modes plus unlimited custom modes; Paraphrase in 23 languages, translate into 40+; Advanced grammar suggestions in 6 languages and tone insights; 25,000 words per month of plagiarism checking; Full AI detector and unlimited humanizer with insights and history; 6,000-word summaries, 300 images per month, 100MB Flow storage, faster processing. Also $39.95 billed every three months ($13.31 per month) and $99.95 billed annually ($8.33 per month), a 58 percent discount on the monthly rate.
- **Team**: Not published contact QuillBot. Everything in Premium for every member; Team usage metrics; User management dashboard; Centralized billing; Data controls; Priority assistance and account management support. The only unpriced part of the product, and the reason QuillBot is a weaker team purchase than Grammarly.

Billing notes:

- Annual billing at $99.95 is a 58 percent discount on the $19.95 monthly rate, one of the steepest annual incentives in this category; the quarterly option at $39.95 splits the difference at $13.31 a month.
- A 14-day money-back guarantee applies to Premium, and subscriptions can be paused rather than only cancelled.
- Feature limits vary across platforms, which the vendor discloses in a footnote; the extension and mobile keyboard do not always behave identically to the web app.
- The plagiarism checker is metered at 25,000 words a month and does not roll over. For a research-heavy user that is roughly two long papers, not a semester.
- Team pricing is not published and there is no self-serve route to seats, so a business buying more than a couple of licences is negotiating rather than checking out.

Value assessment: As an individual purchase at $8.33 a month on annual billing, QuillBot is good value if paraphrasing, summarizing, translation, and citation work are recurring tasks for you. The paraphraser is the best in its narrow class and the surrounding tools are competent. As a business purchase it is much weaker: there are no published seat prices, no publishing integrations, no brand governance, and no long-form generation, so the tool cannot occupy a slot in a content operation. And the comparison that matters is unflattering. A $20 frontier subscription rewrites text at least as well, in any register you can describe, with no word caps and a model you choose. QuillBot's remaining advantages are the Word add-in, the plagiarism checker, and the price on annual billing. Those are real, and they are narrower than the marketing suggests.

## Strengths

- The paraphraser is the best dedicated rewriting engine on the market, with mode variety, a synonym control, side-by-side comparison, and coverage of 23 languages.
- Custom modes let you define a rewriting style in plain language and reuse it, which is more practical for a solo writer than most brand-voice features that cost ten times as much.
- Excellent surface coverage for the price: Chrome, Edge, and Safari extensions, macOS and Windows apps, a Word add-in, and iOS and Android keyboards.
- $99.95 a year for unlimited paraphrasing, plagiarism checking, translation, and summarizing is aggressive pricing against anything comparable.
- The free tier is a genuine product rather than a demo, so evaluating the paraphraser costs nothing.
- Backed by Learneo, a substantial private company, so there is no liquidation risk of the kind that hangs over most tools in this category.

## Limitations

- Selling an AI detector and an AI humanizer in the same subscription is not a defensible integrity position, and the humanizer's effectiveness cannot be verified or guaranteed by anyone including the vendor.
- No model disclosure and no model selection. QuillBot will not say what powers the paraphraser, the chat, or the humanizer.
- No long-form generation, no research, no outlining, no SEO layer, and no CMS publishing, which rules it out of a content production pipeline entirely.
- Team pricing is unpublished, which breaks the self-serve promise for any business wanting more than a personal licence.
- The plagiarism allowance of 25,000 words a month is thin for the academic audience the product is otherwise aimed at.
- The chat and image generator are commodity filler that add nothing a frontier subscription does not do better.
- Feature limits differ between platforms, so what works in the web app may be reduced in the extension or the mobile keyboard.

## Comparisons

- **QuillBot vs Grammarly**: The obvious head-to-head. Grammarly is the better correction layer, has deeper application coverage, and publishes real team pricing at $12 a seat with roles, snippets, and shared terminology. QuillBot is the better rewriter, is cheaper on annual billing at $8.33, and includes translation and citation work Grammarly does not. Grammarly also declines to sell a detector-evasion tool, which QuillBot does not. For a team, Grammarly. For an individual whose main task is reshaping text, QuillBot.
- **QuillBot vs Wordtune**: The closest direct competitor, since both are rewriting-first products. Wordtune's rewrite suggestions are often more natural and its interface is calmer; QuillBot has more modes, custom modes, translation, citations, plagiarism checking, and a lower annual price. If you want a clean rewriter, Wordtune. If you want the whole reshaping toolkit for under $100 a year, QuillBot.
- **QuillBot vs Rytr**: Rytr generates short-form copy from templates at a very low price; QuillBot transforms text you already have. They barely overlap. A solo marketer who needs product descriptions and ad variations wants Rytr; a writer, student, or non-native speaker who needs to rework existing prose wants QuillBot. Neither one produces a publishable long-form article.
- **QuillBot vs Sudowrite**: Both are individual writer tools rather than marketing platforms, and both are cheap. Sudowrite generates fiction with structural memory through its Story Bible and names the models it uses; QuillBot rewrites whatever you feed it and names nothing. A novelist revising a manuscript will get more from Sudowrite's Rewrite and Expand features in context than from QuillBot's mode switching out of context.
- **QuillBot vs Jasper**: Jasper is a marketing content platform with brand voice training, campaign structure, and enterprise controls; QuillBot is a $99-a-year rewriting suite for one person. They compete for nothing. The only reason to compare them is if someone has mistakenly proposed QuillBot as a content-team purchase, in which case the answer is that it has no seat pricing, no publishing, and no governance.

## Implementation

- Setup time: Five minutes. Create an account, install the extension or the Word add-in, and paste text. There is nothing to configure beyond choosing a default paraphrasing mode.
- Learning curve: Very low. The only skill worth acquiring is knowing when the synonym slider has gone too far and produced a sentence that is technically different and semantically wrong, which happens often enough to require reading every output.
- Onboarding: Entirely self-serve for individuals. Team accounts route through a contact form because there is no published seat price.
- Migration: Nothing meaningful to migrate. QuillBot does not own your content library; Flow holds a small amount of document storage that exports as plain text. Switching away costs nothing but the cancelled subscription.

## Platform, API & security

- Platforms: Web application, Chrome, Edge, and Safari extensions, macOS and Windows desktop apps, Microsoft Word add-in, iOS and Android keyboards and apps
- API: No published public API for the paraphraser or any other tool. QuillBot is an end-user product, not a component you can build on.
- Compliance: GDPR, CCPA, Trust center published by Learneo
- Data residency: No published regional hosting options.
- SSO: Not offered on self-serve tiers; data controls and user management are described as team plan features without a published specification.
- Security notes: QuillBot publishes a trust center under its parent company Learneo along with privacy, copyright, community, and academic integrity policies. The academic integrity policy sits uncomfortably beside the humanizer, and buyers with a compliance interest should read both before deploying the tool in an organization where authorship attribution matters.

## Support

- Channels: Help center, Email and contact form, Priority assistance on the team plan
- Documentation: A comprehensive help center covering each tool, billing, subscription pausing, and platform-specific limits.
- Community: No official forum; a large informal user base among students generates plenty of third-party guidance.

## Company

- Founded: 2017
- Founders: Rohan Gupta, Anil Jason, David Silin
- Headquarters: Chicago, Illinois, United States, with roots at the University of Illinois
- Ownership: Owned by Learneo, Inc., the private company formerly known as Course Hero
- Employees: Not disclosed separately from parent company Learneo
- Funding: Acquired by Course Hero in 2021 and now operated as a Learneo business unit; QuillBot's own funding history is subsumed into its parent, which has raised several hundred million dollars and been valued above $3B.

Funding history:

- Acquisition (2021): Not disclosed. Acquired by Course Hero, which renamed itself Learneo in 2023 and operates QuillBot as one of several business units.

Timeline:

- 2017: Founded by Rohan Gupta, Anil Jason, and David Silin at the University of Illinois as a paraphrasing tool for students.
- 2019: Adds the grammar checker and summarizer, turning a single-purpose rewriter into a small suite.
- 2021: Acquired by Course Hero, gaining distribution into a large existing academic user base.
- 2023: Course Hero renames itself Learneo and operates QuillBot alongside its other education businesses; QuillBot adds AI detection.
- 2024: Launches the AI humanizer, selling detector evasion alongside the detector it already shipped, and expands into chat and image generation.
- 2026: Claims more than 35 million writers, with Premium at $19.95 monthly or $99.95 annually and an unpriced team plan adding usage metrics and centralized billing.

## Integrations

Google Chrome extension, Microsoft Edge extension, Safari extension, Microsoft Word add-in, macOS desktop app, Windows desktop app, Android keyboard and app, iOS keyboard and app

## FAQ

### What is QuillBot?

QuillBot is a paraphrasing and rewriting suite. Its core is a text rewriter with multiple stylistic modes, surrounded by a grammar checker, summarizer, translator, citation generator, plagiarism checker, AI-content detector, AI humanizer, and a lightweight chat and image generator. It runs in the browser, in Microsoft Word, on macOS and Windows, and on mobile keyboards.

### How much does QuillBot cost?

Free is $0 with 125-word caps on the paraphraser and humanizer and two paraphrasing modes. Premium is $19.95 per month, $39.95 every three months ($13.31 a month), or $99.95 a year ($8.33 a month). A team plan adds usage metrics, a management dashboard, and centralized billing, but its price is not published.

### Which AI models does QuillBot use?

QuillBot does not say, and there is no model picker. The paraphraser appears to be an in-house engine and the chat feature is presumably built on a third-party model, but neither is disclosed and neither is selectable. In 2026 this is a real gap; competitors including Koala, Sudowrite, and Lex all name their models.

### Does the AI humanizer actually beat AI detectors?

Sometimes, unpredictably, and never with a guarantee. Detector models change without notice, so any claim that humanized text will reliably pass a given check is unverifiable, and QuillBot makes no contractual promise. Treat evasion as a fragile tactic rather than a capability you can plan a content operation around. Note also that QuillBot sells both the detector and the tool for defeating it, which is not a coherent position on integrity.

### Should I buy QuillBot instead of a ChatGPT or Claude subscription?

For rewriting alone, mostly no. A $20 frontier subscription rewrites in any register you can describe, with no word caps, and you choose the model. QuillBot's remaining advantages are the Microsoft Word add-in, the plagiarism checker against academic sources, the citation generator, and the $8.33 annual price. If those specific things matter to you, it is worth having. If they do not, the frontier subscription does the same job better.

### Can QuillBot write blog articles or SEO content?

No. There is no research step, no outlining, no keyword workflow, no SERP analysis, and no publishing to WordPress or Webflow. QuillBot transforms text that already exists. For producing and publishing ranking articles look at Koala, BlogSEO, Byword, or Article Forge instead.

### What does the free plan actually limit?

Mostly word counts. Paraphrasing and humanizing are capped at 125 words per pass, summaries at 1,200 words, chat at 20 conversations, images at 3 a day, and Flow storage at 10MB. You get two paraphrasing modes instead of nine, no custom modes, no plagiarism checking, no translation, no tone insights, and only limited detector access. The engine is the same; the ceilings are the product.

### Who owns QuillBot and my content?

QuillBot is owned by Learneo, Inc., the private company that was Course Hero until it renamed itself in 2023. You retain ownership of the text you put in and get out; QuillBot operates on your text rather than holding it as a content library, and Flow storage exports as plain text. Learneo publishes a trust center, privacy policy, and an academic integrity policy, which is worth reading alongside the humanizer marketing.

### Is there a team or business plan?

There is a team plan with usage metrics, a user management dashboard, centralized billing, data controls, and priority assistance, but the price is not published and there is no self-serve checkout for seats. That makes QuillBot a weaker business purchase than Grammarly, which publishes $12 a member and includes roles, permissions, and shared snippets at that price.

### How good is the plagiarism checker?

Adequate for its purpose and metered at 25,000 words a month on Premium, scanning web and academic sources across more than 100 languages and flagging missed citations. That allowance is roughly two long papers, so it suits a student checking their own work rather than an editor screening a content pipeline. A publishing operation needs a dedicated originality service.

## Editorial verdict

QuillBot is an excellent paraphraser wrapped in a competent suite, sold cheaply to individuals and awkwardly to teams. If your recurring work is reshaping text that already exists, especially across languages or for academic output, $99.95 a year buys the best dedicated rewriting engine available plus plagiarism checking, citations, translation, and a Word add-in, and the free tier lets you verify all of that before paying. Two things should give a business buyer pause. There is no published team price and no publishing, governance, or long-form capability, so QuillBot cannot hold a slot in a content operation. And the product markets an AI detector and an AI humanizer in the same subscription, presenting both as integrity features, which they cannot both be. Buy it as a personal writing utility. Do not buy it as a content strategy, and do not build one on the assumption that the humanizer will keep working.

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Source: SaaSTracker (https://saastracker.org), an independent editorial project. This profile is compiled from public information, carries no peer reviews or paid placement, and was last reviewed 2026-08-22. Awards are judged on published criteria: https://saastracker.org/methodology