Grammarly
Free / Pro from ~$12 per mo (billed annually)
ProWritingAid
Free / Premium ~$10–12 per mo (lifetime option)
Grammarly is a polished real-time writing assistant that works almost everywhere you type. ProWritingAid is a deeper editing tool with in-depth style reports and a lifetime pricing option, favored by authors. Grammarly wins on real-time polish and reach; ProWritingAid wins on depth and long-form editing.
Pick Grammarly if you want fast, accurate, real-time writing help that follows you across email, docs, and the web.
Pick ProWritingAid if you write long-form and want deep style reports and editing analysis, or prefer a one-time lifetime license.
Grammarly and ProWritingAid both catch errors and improve your writing, but they suit different writers. Grammarly is the polished, ubiquitous assistant — fast, accurate real-time suggestions that follow you across email, documents, and the web, with a clean experience that just works. ProWritingAid goes deeper for long-form writing: it offers detailed reports on style, pacing, overused words, sentence variety, and readability, which is why novelists and serious writers favor it, and it offers a one-time lifetime purchase.
On price, both have free tiers; Grammarly Pro runs around $12 a month billed annually, while ProWritingAid Premium is roughly $10–12 a month with a notable lifetime option. The choice is mostly real-time polish and reach (Grammarly) versus depth and long-form editing reports (ProWritingAid).
We compare real-time help, depth, pricing, reports, and long-form editing.
| Quick facts | Grammarly | ProWritingAid |
|---|---|---|
| Free plan | Yes | Yes (limited) |
| Paid price | Pro from ~$12/mo (annual) | Premium ~$10–12/mo |
| Lifetime purchase option | No | Yes |
| In-depth writing reports | Good | Best-in-class |
| Best for | Real-time everyday writing | Authors & long-form |
Each row reflects the feature on each product's current public release.
| Feature | G Grammarly | P ProWritingAid |
|---|---|---|
| Real-time grammar & spelling | Best-in-class | Good |
| Works across web & apps | Best-in-class | Good |
| In-depth style & readability reports | Good | Best-in-class |
| Long-form / manuscript editing | Good | Best-in-class |
| Tone & clarity suggestions | Best-in-class | Strong |
| AI rewrite / generative help | Yes | Yes |
| One-time lifetime license | No | Yes |
| Author / fiction-focused tools | Limited | Strong |
Pricing and features change often. Always verify the current details on each product's official site. Last reviewed 2026-06-26.
Things neither product's marketing page leads with.
Grammarly is more polished and works almost everywhere in real time, but its long-form editing reports are lighter than ProWritingAid's.
ProWritingAid is deeper for manuscripts and offers a lifetime option, but its real-time experience and app coverage trail Grammarly.
For everyday writing across apps Grammarly wins; for serious long-form editing ProWritingAid wins.
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