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Grammarly vs ChatGPT compares two AI writing assistants. Grammarly checks grammar, clarity and tone as you type across browsers, email and documents. By contrast, ChatGPT drafts, edits and rewrites whole documents in chat or in its full-screen editor.
Our reviews, for example, score Grammarly 3.5 and ChatGPT 3.6. So the choice depends on the job and how much you care about data terms.
Grammarly vs ChatGPT: The Short Answer
Choose ChatGPT, first, on our scores: it scores 3.6 against 3.5 and fits edits and rewrites of whole drafts.
Choose Grammarly, however, if you want real-time polish across your apps; its entry paid plan is Pro $12 a month yearly. Our list of Grammarly alternatives ranks the options by our review scores.
Head to Head
| Criterion | Grammarly | ChatGPT |
|---|---|---|
| Best for | Real-time polish across your apps | Edits and rewrites of whole drafts |
| Works in | Browsers, email, desktop apps | Web, desktop and mobile apps |
| Free plan | Basics; 100 AI prompts | Free; ads in test regions |
| Entry paid plan | Pro $12 a month yearly | Go $8 a month (US) |
| Billing | Per member; $30 monthly | Flat monthly plans |
| Training on your data | On by default; opt-out | On by default; opt-out |
| Our score | 3.5 | 3.6 |
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 you if you want real-time polish across your apps.
In contrast, ChatGPT drafts, edits and rewrites whole documents in chat or in its full-screen editor. It suits you if you want edits and rewrites of whole drafts.
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. ChatGPT, meanwhile, starts with a free plan with everyday chats on GPT-5.6 Luna, with Go $8 a month (US) as its entry paid plan.
Billing also works differently. Grammarly uses per-member plans, at $30 monthly or $12 a month yearly.
ChatGPT, however, uses flat monthly plans, from Go at $8 in the US. 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 ChatGPT, by contrast, personal plans train by default, with an opt-out in Data controls.
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. ChatGPT’s Free and Go plans may show ads in test regions.
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 edits and rewrites of whole drafts. Our Grammarly vs Claude for editing comparison also weighs price and data terms.
Overall, in Grammarly vs ChatGPT our scores favor ChatGPT, 3.6 against 3.5.
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 ChatGPT for writing, 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 QuillBot and Grammarly vs Wordtune comparisons.
How We Research
This Grammarly vs ChatGPT 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 ChatGPT FAQ
Our scores favor ChatGPT, 3.6 against 3.5.
Entry paid plans are Pro $12 a month yearly and Go $8 a month (US), in that order.
For Grammarly, individual plans train by default, with an opt-out in settings. For ChatGPT, personal plans train by default, with an opt-out in Data controls.
Yes: Grammarly offers grammar, spelling and tone checks with 100 AI prompts a month, and ChatGPT offers a free plan with everyday chats on GPT-5.6 Luna.
Yes; many people use one for its strength and the other to cross-check.
The Verdict
Overall, Grammarly vs ChatGPT favors ChatGPT 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.