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LanguageTool vs QuillBot

Which one should you try?

LanguageTool

Freemium

Best for Writers and professionals seeking error-free text

Visit LanguageTool See full review

QuillBot

Freemium

Best for Students and academics requiring writing improvement and plagiarism detection

Visit QuillBot See full review

Pricing, capabilities and platforms side by side. Prices are as of the "Pricing checked" date in the table.

LanguageTool

LanguageTool

LanguageTool operates as a browser add-on, office plugin, and standalone editor, catching grammar, spelling, punctuation, and style errors wherever text is typed. The paraphrasing tool lets you rewrite sentences on the spot without switching to a separate application. The API gives development teams a way to pipe checks directly into internal tools or content pipelines. The ceiling appears when you need deep style enforcement: custom brand-voice rules and advanced style guidance are paid-only features, so free-tier users get error correction but not the consistency layer that brand and comms teams actually need.

QuillBot

QuillBot

The platform bundles a paraphraser, grammar checker, AI detector, plagiarism checker, humanizer, summarizer, translator, citation generator, image generator, and PDF tools under one login, with a Chrome and Edge extension that follows you outside the platform. The free tier is real and permanent — no expiry, no card required — but the features that matter most for professional use, specifically advanced writing recommendations and full plagiarism checking, are paid-only. The paraphrasing and grammar tools are where QuillBot built its reputation; the image generation and presentation tools are newer additions that the vendor positions as a full creative suite but that community reports suggest are thinner than the writing core. No API is available, so you cannot embed any of this into your own product pipeline — every workflow runs through their UI or extensions.

AttributeLanguageToolQuillBot
PricingFreemiumFreemium
Price$24.90/month$19.95/month or $99.95/year (Premium); Free tier available
Pricing checkedJul 1, 2026Not checked yet
Free trialNot statedNot stated
Open sourceNoNo
Has APIYesNo
Self-hosted optionNoNo
PlatformsWeb, Chrome, Edge, Firefox, Safari, Opera, Gmail, Apple Mail, Thunderbird, Google Docs, Word, Apple Pages, LibreOffice, macOS, WindowsWeb (quillbot.com), Chrome extension, Edge extension, Safari extension, Microsoft Word add-in, macOS desktop app, Windows desktop app, iOS app, Android app
Released—2017
Pros
  • Checks text in 30+ languages with automatic language detection, so multilingual teams avoid manual mode-switching when documents mix languages.
  • Add-ons cover every major browser and office suite — Chrome, Word, Google Docs, Gmail, LibreOffice among them — which means writers get corrections inside the tools they already use instead of copying text into a separate checker.
  • A Proofreading API is available for developer integration, so teams can embed grammar checks directly into content pipelines or internal tools without building their own NLP layer.
  • The browser add-on processes text without storing it locally, the vendor states, so teams with basic data-handling requirements can deploy it without a dedicated privacy review of client-side storage.
  • A personal dictionary and writing statistics are available in the editor, so writers can track error patterns over time and build vocabulary the tool does not flag incorrectly.
  • Permanent free tier with no credit card required, so teams can evaluate the paraphraser and grammar checker against real documents before committing budget.
  • Browser extensions for Chrome and Edge surface the grammar and paraphrasing tools inline on any webpage, which means you skip the copy-paste loop every time you write outside the platform.
  • A unified workspace covering writing, originality checking, translation, summarization, and image generation under one login, so you stop maintaining separate accounts across five category-specific tools.
  • AI Detector and Plagiarism Checker in the same dashboard as the writing tools, which means educators and content teams can run both checks without switching platforms mid-review.
  • Translation and Humanizer tools in the same environment as grammar and paraphrasing, so non-native English writers can move from a translated draft to a polished, natural-sounding output without leaving the workspace.
Cons
  • Advanced style suggestions, brand voice consistency rules, and unlimited paraphrasing are paid-only features. A comms or content team that deploys the free tier expecting style enforcement will find the correction layer stops at grammar and basic spelling — they either upgrade or manually enforce style in a separate pass.
  • There is no self-hosted option and no downloadable binary. Organizations under strict data-residency requirements or internal security policies that prohibit sending document text to external servers cannot use LanguageTool at all, and will move to an on-premise alternative or build their own correction layer.
  • The paraphrasing tool has a usage cap on the free tier. Writers who lean on it for rewriting multiple drafts per day hit the ceiling mid-session and either stop or upgrade — there is no graceful degradation that preserves partial functionality.
  • API access at production volume is a paid-only feature. A team that prototypes on the free API and plans to scale will discover the rate limits before launch, requiring a billing decision they did not budget for at the start of the project.
  • No API and no self-hosted option — any workflow that needs to call QuillBot from a CMS, automate checks at publishing time, or embed the tools in a product hits a hard wall immediately. Teams with that requirement switch to providers like OpenAI or Grammarly Business, which expose programmatic access.
  • Advanced writing recommendations and full plagiarism detection are paid-only features, which means the free tier is adequate for casual rewrites but falls short for the academic integrity and professional polish use cases the platform is explicitly marketed toward — users discover this ceiling only after building a workflow around the free tools.
  • The image generation, presentation creation, and visual editing tools are additions to a platform built around text; community feedback consistently describes the writing core as the defensible product, and teams with serious visual production needs find the image tools insufficient compared to dedicated generators.
  • Team collaboration features are gated behind a paid plan, so organizations trying to enforce shared grammar and style standards across a group cannot use the platform without paying — the free tier is strictly single-user in practice.

Made up your mind?

LanguageTool

Freemium

Best for Writers and professionals seeking error-free text

Visit LanguageTool See full review

QuillBot

Freemium

Best for Students and academics requiring writing improvement and plagiarism detection

Visit QuillBot See full review

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Specs come from each tool's own site and docs (how we test). AIDiveForge is editorially independent.

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