Pick Grammarly if…
you write lots of short pieces across many apps and want mistakes and tone fixed as you go, with plagiarism checks in the same plan.
Both check grammar and style, at different scales. Grammarly works sentence by sentence in real time wherever you type, with a tone detector and generative rewrites on top. ProWritingAid was built for authors: 20+ in-depth reports on pacing, overused words and readability across a whole manuscript, with Word, Google Docs and Scrivener integrations. Short everyday writing suits Grammarly; long-form work suits ProWritingAid.
Pick Grammarly for emails, documents and messages: the free plan already covers real-time grammar and tone, and Pro ($30/mo monthly) adds rewrites and plagiarism detection. Pick ProWritingAid (Premium at $30/mo monthly) if you write books, theses or long posts and want manuscript-level reports.
| App | Free tier | Paid from | Top plan | Best for |
|---|---|---|---|---|
| Grammarly | Yes | $30/mo | $30/mo | Non-native and casual writers who want real-time grammar, tone, and clarity fixes everywhere they type |
| ProWritingAid | Yes | $30/mo | $36/mo | Novelists, academics, and bloggers who want in-depth style reports (pacing, overused words, readability) on full manuscripts |
Monthly prices in US dollars before tax, from each vendor's official pricing (US list price; weekly-billed plans converted to a monthly figure). Updated November 2, 2026
| Grammarly | ProWritingAid | |
|---|---|---|
| Strength | Real-time grammar, spelling and tone everywhere you type | 20+ in-depth reports on full manuscripts |
| Free tier | Real-time checks, tone detector, 100 AI prompts/mo | 500 words per check, core suggestions |
| Main paid plan | Pro: full-sentence rewrites, 2,000 AI prompts/mo | Premium: unlimited word count, all reports |
| Plagiarism check | Included in Pro, plus AI-text detection | Not included in any plan; bought separately |
| Where it works | Everywhere you type; Enterprise adds SSO, SCIM | Browser extension, desktop app, Word, Google Docs, Scrivener |
you write lots of short pieces across many apps and want mistakes and tone fixed as you go, with plagiarism checks in the same plan.
you're a novelist, academic or blogger who wants to edit a whole manuscript for style, pacing and repetition.
Both monthly prices are high next to their annual rates: Grammarly Pro drops to well under half on annual billing, and ProWritingAid Premium to about a third. ProWritingAid also sells lifetime licences for Premium and Premium Pro, which Grammarly doesn't offer. If you'll use the tool for years, that changes the comparison.
For long-form writing, often yes, because its manuscript reports go beyond Grammarly's sentence-level fixes. For quick, real-time corrections across apps, Grammarly is simpler, and ProWritingAid's 20+ reports can be too much if you just want fast fixes.
The monthly list prices are the same: Grammarly Pro $30/mo, ProWritingAid Premium $30/mo. Billed annually, ProWritingAid is slightly cheaper, and it adds a lifetime option.
Yes, with core grammar and style suggestions, capped at 500 words per check.
How we choose: prices come from each vendor's official pricing page and are re-checked every week. We take no affiliate fees, so rankings aren't for sale.