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 June 2026.
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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