Grammarly vs ProWritingAid
Both mark up a draft. They are aimed at different lengths of work. Grammarly grew up on email and the browser. ProWritingAid grew up on manuscripts.
Grammarly
Freemium
Nonfiction, student writing, and business prose where clarity matters more than voice.
ProWritingAid
Subscription
Authors who want a book-length style report after the story is down, fiction or nonfiction.
| Grammarly | ProWritingAid | |
|---|---|---|
| Unit of work | The sentence and the paragraph in front of you, everywhere you type. | The manuscript. Reports make more sense on a full chapter or a full book. |
| What it nags you about | Grammar, clarity, tone, and a pull toward polite, standard prose. | Repeats, sticky sentences, pacing, echoes, and style habits across many pages. |
| Price shape | A useful free tier. Premium if you want the fuller rewrite and tone tools. | Subscription, with a lifetime license offered in some seasons. Budget for the paid product. |
| Fiction | Often fights dialect, fragments, and anything that is supposed to sound like a person. | Built with fiction in the mix. Still wrong sometimes, but wrong about book problems. |
| A poor fit when | You are line-editing a novel and care about voice more than office clarity. | You only needed someone to catch a comma in an email. |