Grammarly and Hemmingway are often put side by side, but they start from opposite ends. Grammarly starts from what you wrote and makes it more correct. Hemmingway starts from what you want to say and writes it.
The difference in one line
- Grammarly checks your writing as you type: spelling, grammar, clarity and tone, with AI suggestions for rewriting, inside the apps and sites you already use.
- Hemmingway writes the message for you: you say who it is for and what you want said, and it writes it the way you would. In its apps it reads your mail and chats and drafts the replies.
Side by side
| Hemmingway | Grammarly | |
|---|---|---|
| Starts from | What you want to say | What you already wrote |
| Main job | Writing the message | Correcting and polishing |
| Knows who you are writing to | Yes, through People | No |
| Drafts replies from your inbox | Yes, in the apps | No |
| Model | Our own, Hemmingway-1.5 | Grammarly's AI |
When to use which
Grammarly suits people who like writing their own words and want a second pair of eyes: a typo caught, a sentence tightened, a tone flagged before a message goes out.
Hemmingway suits people who would rather not write the message at all. The reply to a client, the text to a landlord, the email that has sat in your inbox for three days. You give it the facts; it gives you a message in your voice, one version, with nothing around it to cut.
Why Hemmingway's drafts do not need much fixing
Hemmingway writes with Hemmingway-1.5, our newest model. 90% of its writing passes GPTZero & Pangram and the top AI detectors on the first try, more often than real human writing does (86%). How that was tested.
It is built on Hemmingway-1, which was trained for everyday writing and tested against the largest models at it. In our blind tests on eighty real email and message requests Hemmingway-1 came first, and a judge asked which of two replies a person wrote picked its version more often than any other model's. The numbers are here.
Privacy
We never train our models on your chats, memory or People. Our privacy page lists everything we keep, in plain terms.
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Common questions
What is the difference between Hemmingway and Grammarly?
Grammarly checks what you have already written: spelling, grammar, clarity and tone. Hemmingway starts from what you want to say and writes the message for you, in your voice. In its apps it can also read your mail and chats and draft the replies.
Is Hemmingway a grammar checker?
Not as you type. Its main job is writing messages for you, and its free grammar checker corrects text you paste in and leaves your wording alone. If you want mistakes underlined as you type in other apps, a checker such as Grammarly is the better fit.
Which AI writes emails in your own voice?
Hemmingway is built for it. You tell it who someone is through People, and it writes to them the way you would, one version with nothing around it to cut. Its model, Hemmingway-1.5, passes AI detectors 90% of the time, and Hemmingway-1, the model it is built on, came first in our blind tests on eighty real email and message requests.
Does Hemmingway train on what I write?
No. We never train our models on your chats, memory or People. Our privacy page lists everything we keep, in plain terms.