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Grammarly AI vs QuillBot

Which one should you try?

Grammarly AI

Freemium

Best for Proofreading written content

Visit Grammarly AI 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.

Grammarly AI

Grammarly AI

Grammarly sits in your browser and writing apps, flagging mistakes as you type—grammar, spelling, tone, clarity. It's useful if you write emails, documents, or social posts and want a second pair of eyes without leaving your workflow. The free tier covers basics; Premium ($12/month) adds tone detection and advanced rewrites. The catch: the free version is genuinely limited, and Premium's AI-powered suggestions sometimes miss context or feel prescriptive. It works best for high-stakes writing where accuracy matters more than speed.

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.

AttributeGrammarly AIQuillBot
PricingFreemiumFreemium
PricePro $12/mo billed annually ($144/yr) or $30 month to month$19.95/month or $99.95/year (Premium); Free tier available
Pricing checkedOct 19, 2026Not checked yet
Free trialNot statedNot stated
Open sourceNoNo
Has APIYesNo
Self-hosted optionNoNo
PlatformsWindows, Mac, browser extensions (Chrome, Safari, Firefox, Edge), Microsoft Office, Google Docs, iPhone, iPad, AndroidWeb (quillbot.com), Chrome extension, Edge extension, Safari extension, Microsoft Word add-in, macOS desktop app, Windows desktop app, iOS app, Android app
Languages95+ languages—
Released20092017
Pros
  • Real-time feedback
  • Grammar and spelling corrections
  • Integrated with popular platforms
  • 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
  • Limited free tier accounts
  • Subscription required for advanced features
  • 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?

Grammarly AI

Freemium

Best for Proofreading written content

Visit Grammarly AI 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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