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QuillBot

by Learneo, Inc.

AI writing assistant for paraphrasing, grammar checking, summarizing, and citations

AI AgentAssistant

Last reviewed 2026-06-20

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QuillBot is a consumer and student-focused AI writing assistant best known for its paraphrasing tool and grammar checker. It bundles a suite of text utilities (paraphraser, grammar/spelling checker, summarizer, AI humanizer, translator, citation generator, plagiarism checker, and AI detector) plus a co-writer document editor called Flow, available on the web, browser extensions (Chrome, Edge, Safari), Microsoft Word, macOS, Windows, iOS, and Android. It is positioned at students, academics, job seekers, and professionals who want to rewrite, polish, and check existing text rather than generate content from scratch end-to-end. QuillBot was founded in 2017 and acquired in 2021 by Learneo (formerly Course Hero, Inc.), which also owns LanguageTool, Scribbr, CliffsNotes, LitCharts, and Symbolab. The company reports 35M+ users; it is an assistant-grade tool, not an autonomous agent: it suggests rewrites and corrections that the user reviews and accepts.

What it can do

  • Paraphrase and rewrite text

    Assistant

    Rewrites pasted or selected text in multiple tone/style modes (2 free, 10+ premium such as Standard, Fluency, Formal, Academic, Simple) to make it clearer or more concise; the user picks and accepts the rewrite.

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  • Check grammar, spelling, and punctuation

    Assistant

    Flags grammar, spelling, and punctuation issues and suggests corrections inline; a free no-sign-up grammar checker is offered. The human reviews and applies each fix.

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  • Summarize documents

    Assistant

    Condenses articles, papers, and pasted text into key sentences or a paragraph; premium adds custom-length summaries.

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  • Humanize and detect AI text

    Assistant

    Rewrites AI-generated text to read more naturally (AI Humanizer) and includes an AI-content detector; free tier is capped (reportedly ~125 words and a few uses per day) with unlimited use on premium.

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  • Generate citations and check plagiarism

    Assistant

    Builds formatted citations (a citation generator) and runs a plagiarism check (premium, reportedly up to 25,000 words/month), aimed at academic writing.

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  • Co-write in the Flow editor

    Copilot

    Flow is a document editor that combines QuillBot's tools (paraphrase, summarize, cite, AI Review, Suggest Text) in one workspace and surfaces grammar fixes and sentence suggestions as the user writes; it is a copilot-style suggester, not an autonomous drafting agent.

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Strengths

  • +Strong, popular paraphrasing tool with multiple rewrite modes and a generous free tier
  • +Broad surface coverage: web app, browser extensions, Word add-in, and mobile/desktop apps that work across Gmail, Docs, LinkedIn, and more
  • +Useful integrated academic stack (citations, plagiarism check, summarizer) under one affordable subscription

Limitations

  • −Assistant-grade only: it suggests and rewrites, it does not autonomously research, draft, or take actions end-to-end
  • −Free tier is heavily capped (reportedly ~125-word paraphrase/humanize limits) and the best modes are paywalled
  • −No public API, MCP, or integration protocol, so it does not slot into agent workflows or automation

Overview

QuillBot is a widely used AI writing assistant aimed at students, academics, job seekers, and professionals who want to rewrite, polish, and check text they already have. It is best known for its paraphrasing tool and grammar checker, and it bundles a suite of text utilities plus a co-writer editor called Flow. The company reports 35M+ users across 180+ countries. QuillBot was founded in 2017 and acquired in 2021 by Learneo (formerly Course Hero, Inc.), the parent that also owns LanguageTool, Scribbr, Symbolab, CliffsNotes, and LitCharts.

What it does

The core is the Paraphraser, which rewrites selected text in multiple tone/style modes (2 free, 10+ on premium) so it reads clearer, more formal, or more concise. Around it sit a Grammar Checker (a free no-sign-up version exists), a Summarizer, an AI Humanizer and AI Detector, a Translator, a Citation Generator, and a Plagiarism Checker. Flow is a document editor that puts those tools in one workspace and surfaces grammar fixes and sentence suggestions (plus a Suggest Text feature and AI Review) as you write. Across all of these the user reviews and accepts each suggestion, so QuillBot is an assistant, with Flow behaving more like a copilot. It does not research, plan, or take actions autonomously.

Integrations & setup

QuillBot runs as a web app and ships browser extensions for Chrome, Edge, and Safari, a Microsoft Word add-in, and macOS, Windows, iOS, and Android apps. The extension works inside common web surfaces such as Gmail, Google Docs, LinkedIn, and other text fields. There is no documented public API, MCP server, or agent protocol, so it does not plug into automation or agent workflows.

Pricing

Freemium. The free tier caps paraphrasing and humanizing (reportedly ~125 words per use) and limits some tools. Premium is reportedly about $9.95/month month-to-month, roughly $8.33/month billed annually (about $99.95/year), with a Team plan at custom pricing. Regional pricing varies, so confirm on the pricing page.

Best for / not for

Best for students, academics, and professionals who need a reliable, affordable tool to rewrite, proofread, summarize, and cite existing text across the browser and Word. Not for teams that need autonomous content generation, web research, API access, or anything that takes actions on its own: those buyers should look at agentic content platforms instead.

Alternatives

Grammarly and Wordtune are the closest direct competitors on rewriting and grammar. For generative, marketing-oriented writing, Jasper, Copy.ai, and Writer compete, though they target content generation more than paraphrasing and proofreading.

What people are saying

We aggregate real LinkedIn discussion into sentiment for the agents people search most. QuillBot isn't tracked yet, want it added? Request tracking.

FAQ

Is QuillBot an AI agent?+

No. QuillBot is an assistant-grade AI writing tool. It paraphrases, checks grammar, summarizes, and suggests edits to text you give it, and a human reviews and accepts each change. It does not act autonomously, research the web, or take multi-step actions without you, so it sits at the 'assistant' end of the autonomy ladder (with the Flow editor behaving more like a copilot).

Who owns QuillBot?+

QuillBot was founded in 2017 and acquired in 2021 by Learneo, Inc. (formerly Course Hero, Inc.), which also owns LanguageTool, Scribbr, Symbolab, CliffsNotes, and LitCharts.

How much does QuillBot cost?+

There is a free tier with capped paraphrasing, grammar, and humanizer use. Premium is reportedly about $9.95/month month-to-month, dropping to roughly $8.33/month when billed annually (about $99.95/year), with a Team plan at custom pricing. Check the pricing page for current numbers as they change by region.

Sources

Last reviewed 2026-06-20

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