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Grammarly vs QuillBot compares two AI writing assistants. Grammarly checks grammar, clarity and tone as you type across browsers, email and documents. By contrast, QuillBot paraphrases in nine modes and adds grammar checks, summaries, citations and plagiarism checks.
Our reviews, for example, score Grammarly 3.5 and QuillBot 3.4. So the choice depends on the job and how much you care about data terms.
Grammarly vs QuillBot: The Short Answer
Choose Grammarly, first, on our scores: it scores 3.5 against 3.4 and fits real-time polish across your apps.
Choose QuillBot, however, if you want paraphrasing and citation help; its entry paid plan is Premium $8.33 a month yearly.
Head to Head
| Criterion | Grammarly | QuillBot |
|---|---|---|
| Best for | Real-time polish across your apps | Paraphrasing and citation help |
| Works in | Browsers, email, desktop apps | Web, browsers, desktop, Word |
| Free plan | Basics; 100 AI prompts | 125-word paraphrasing |
| Entry paid plan | Pro $12 a month yearly | Premium $8.33 a month yearly |
| Billing | Per member; $30 monthly | $19.95 monthly or $99.95 a year |
| Training on your data | On by default; opt-out | Opt-out; Team excluded |
| Our score | 3.5 | 3.4 |
What Each Does
To begin with, Grammarly checks grammar, clarity and tone as you type across browsers, email and documents. As a result, it suits people who want real-time polish across your apps.
In contrast, QuillBot paraphrases in nine modes and adds grammar checks, summaries, citations and plagiarism checks. It suits people who want paraphrasing and citation help.
Prices and Billing
Grammarly starts with grammar, spelling and tone checks with 100 AI prompts a month, and its entry paid plan is Pro $12 a month yearly. QuillBot, meanwhile, starts with 125-word paraphrasing in two modes, with Premium $8.33 a month yearly as its entry paid plan.
Billing also works differently. Grammarly uses per-member plans, at $30 monthly or $12 a month yearly.
QuillBot, however, uses a single Premium plan at $19.95 monthly or $99.95 a year. Our list of the best AI tools for writers compares more options.
Data and Training
On training, for Grammarly, individual plans train by default, with an opt-out in settings. For QuillBot, by contrast, account holders can opt out, and Team inputs are excluded.
Therefore, keep confidential writing out until training is off. Our guide to which AI tools train on your data compares more tools.
Accuracy and Voice
A 2026 class action targets Grammarly’s since-disabled Expert Review feature. QuillBot’s Humanizer raises academic-integrity questions, so follow your school’s rules.
Rewrites can shift meaning or flatten your voice, so read each suggestion before accepting it.
Our guide to writing with AI without sounding like AI also covers the checklist, and our list of the best AI for writing ranks more tools.
Winners by Category
In short, Grammarly wins for real-time polish across your apps. The other tool, by contrast, wins for paraphrasing and citation help. Our list of Grammarly alternatives also covers prices and data terms.
Overall, in Grammarly vs QuillBot our scores favor Grammarly, 3.5 against 3.4.
Which One to Choose
Therefore, take Grammarly if you want real-time polish across your apps. Otherwise, the other tool may fit better.
Our pages on best AI for email writing and best AI for summarization, in addition, cover other options.
Whichever you pick, our guides to using AI for editing and avoiding overuse of AI in writing also help.
Other pairings are covered in our Grammarly vs Wordtune and ChatGPT vs Lex comparisons.
How We Research
This Grammarly vs QuillBot comparison reuses the sources behind our reviews of each tool, read between July and October 4, 2026, including QuillBot’s trust center and Grammarly’s help center.
However, we run no tests of our own. Our about page explains the criteria, and our list of the best AI for students covers more tools.
Grammarly vs QuillBot FAQ
Our scores favor Grammarly, 3.5 against 3.4.
Entry paid plans are Pro $12 a month yearly and Premium $8.33 a month yearly, in that order.
For Grammarly, individual plans train by default, with an opt-out in settings. For QuillBot, account holders can opt out, and Team inputs are excluded.
Yes: Grammarly offers grammar, spelling and tone checks with 100 AI prompts a month, and QuillBot offers 125-word paraphrasing in two modes.
Yes; many people use one for its strength and the other to cross-check.
The Verdict
Overall, Grammarly vs QuillBot favors Grammarly on our scores. The other, however, still wins for its own kind of job.
So pick by the job, check the output, and also keep sensitive material out of lower plans.