Grammarly and QuillBot are often mentioned together, but they do not really do the same job. Grammarly is a proofreader — it catches grammar, spelling, clarity, and tone issues as you type, everywhere you write. QuillBot is a rewriter — its paraphrasing tool reshapes sentences into different tones and styles, and it adds a summarizer and citation tools. Knowing which problem you are solving makes the choice easy.
At a glance
| Grammarly | QuillBot | |
|---|---|---|
| Our score | 9.1 | 8.3 |
| Best for | Correcting writing | Rewording & paraphrasing |
| Starts at | $12/mo | $10/mo |
| Grammar correction | Excellent | Good |
| Paraphrasing / rewriting | Fair | Excellent |
| Summarizer | No | Yes |
| Real-time everywhere | Excellent | Good |
| Citation generator | No | Yes |
How they are built differently
Grammarly is built to make your existing writing correct and clear, running in real time across the browser and apps with a polished interface. QuillBot is built to transform text: paste a sentence and it will reword it in several modes (standard, fluency, formal, creative and more), which is invaluable for students, non-native writers, and anyone escaping their own phrasing. QuillBot also folds in a summarizer, a grammar checker, and a citation generator, making it a small toolkit rather than a single proofreader.
Round 1: Grammar & correctness — Grammarly
Grammarly catches more errors more accurately and explains them better, with real-time checking that follows you everywhere. QuillBot’s grammar checker is decent but secondary to its rewriting. Winner: Grammarly.
Round 2: Paraphrasing & rewriting — QuillBot
QuillBot’s paraphraser is the best in this pair by a wide margin, with multiple modes and a synonym slider that Grammarly cannot match. For rewording, it is the tool. Winner: QuillBot.
Round 3: Extra tools — QuillBot
QuillBot bundles a summarizer, citation generator, and translator alongside paraphrasing, giving students and researchers more in one place than Grammarly offers. Winner: QuillBot.
Round 4: Ubiquity & polish — Grammarly
Grammarly works in more places and feels more refined for everyday writing across email, docs, and the web, where QuillBot is more of a destination tool. Winner: Grammarly.
Pricing compared
QuillBot is slightly cheaper (around $10/month versus Grammarly’s $12), and both have genuinely useful free tiers — Grammarly’s free plan covers everyday corrections, while QuillBot’s free paraphraser and summarizer are enough for light use with word-count limits. Because they do different jobs, the price comparison matters less than the fact that many writers happily pay for both without much overlap.
Where each one struggles
Grammarly is weak at rewriting — it suggests fixes, not fresh phrasings — and its premium features cost more. QuillBot is excellent at paraphrasing but a weaker general proofreader, and heavy paraphrasing without editing can flatten your voice or introduce awkward phrasing. Both are aids, not replacements for reading your work carefully.
Who should choose Grammarly
Choose Grammarly if your main need is correct, clear writing everywhere you type, with the best real-time error checking and tone suggestions. It suits professionals, students, and everyday writers. Read our full Grammarly review.
Who should choose QuillBot
Choose QuillBot if you frequently reword, paraphrase, or summarize — students, non-native English writers, and researchers get the most from its paraphraser and citation tools at a lower price. Read our full QuillBot review.
FAQ
The bottom line
Grammarly and QuillBot are complementary more than competing. Pick Grammarly to correct and clarify; pick QuillBot to reword, summarize, and cite. See how both rank in our best AI grammar checkers guide.