Grammarly vs QuillBot
Grammarly is the better fit for everyday proofreading in many apps, while QuillBot is stronger when your main job is paraphrasing and summarizing.
Pick Grammarly if…
You want grammar, clarity and tone suggestions where you already write, across desktop, mobile and browser. You are fine paying for Pro to get rewrites and plagiarism checks.
Pick QuillBot if…
You mostly rewrite or summarize text and want a free Paraphraser and tools you can try without signing up. You are happy to check the current plan terms before paying.
Price
- Freemium
- Freemium
Starting price
Free plan
Open source
Works on
| Feature | AI writing assistant that checks grammar and spelling and suggests rewrites and tone changes. | Paraphrasing, grammar checking and summarizing tools for rewriting and polishing text. |
|---|---|---|
| Price |
|
|
| Starting price | $12/month (Pro, USD; the plans page does not say whether this is billed monthly or annually) | $8.33 per month, billed annually ($99.95 billed every twelve months) |
| Free plan | Yes | Yes |
| Open source | No | No |
| Works on | Web, Windows, macOS, iOS, Android, Browser extension | Web, Windows, macOS, iOS, Android, Browser extension |
| Try Grammarly (opens the Grammarly website in a new tab) | Try QuillBot (opens the QuillBot website in a new tab) |
Grammarly describes itself as an AI writing assistant that proofreads, adjusts tone and suggests rewrites. It runs on Windows and Mac, on iPhone, iPad and Android, in Chrome, Safari, Firefox and Edge, and in Microsoft Office and Google Docs. QuillBot is a suite of separate tools (Paraphraser, Grammar Checker, Summarizer, AI Detector and others) with apps and extensions for Chrome, Edge, Safari, Word, Windows, macOS, iOS and Android.
Both have free plans. Grammarly Free covers spelling and grammar checks, tone visibility and 100 AI prompts per month. QuillBot's free Paraphraser needs no sign-up and offers two modes (Standard and Fluency), and QuillBot's pages list a free Grammar Checker, AI Detector, Summarizer, Citation Generator and Translate.
On paid pricing, Grammarly Pro is listed at $12 per month and adds full-sentence rewrites, tone adjustment, AI-text and plagiarism detection and 2,000 AI prompts per member per month. QuillBot's FAQ page lists Premium at $8.33 per month billed annually ($99.95), $13.31 per month billed every 3 months and $19.95 monthly, with nine preset Paraphraser modes plus unlimited custom modes. We could not read QuillBot's live pricing page, so confirm its current price before buying.
In short, choose Grammarly if you want one assistant that follows you across apps, and QuillBot if you want a set of rewriting and summarizing tools with a generous free entry point.
One new comparison, every week
Two tools side by side with our verdict, in one short email. Unsubscribe any time.
Last updated 16 October 2026. How we make money