Grammarly vs ProWritingAid
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Grammarly if you want ai writing assistant that checks, rewrites, and drafts across 1m+ apps and sites (Copilot, freemium); choose ProWritingAid if you want grammar, style, and manuscript-editing assistant for authors and long-form writers (Copilot, freemium).
| Grammarly | ProWritingAid | |
|---|---|---|
| What it is | AI writing assistant that checks, rewrites, and drafts across 1M+ apps and sites | Grammar, style, and manuscript-editing assistant for authors and long-form writers |
| Type | product-with-agents | product-with-agents |
| Autonomy | Copilot | Copilot |
| Pricing | freemium · $12/member/mo (Pro, billed annually) | freemium · $10/mo (Premium, billed annually) |
| Best for | consumers, smb, mid-market, enterprise | consumers, smb |
| Deployment | saas, api | saas |
| Modalities | text, browser, email, api | text, browser |
| Models | proprietary, model-agnostic | proprietary |
| Protocols | rest-api | none |
| Integrations | Gmail, Google Docs, Microsoft Word, Microsoft Outlook, Slack, Chrome | Microsoft Word, Google Docs, Scrivener, Apple Pages, Apple Notes, Chrome |
| Capabilities | 5 documented | 5 documented |
Grammarly
- +Works almost everywhere people write (1M+ apps and websites, browsers, email, and desktop apps)
- +Strong free tier with usable everyday grammar, spelling, and tone checking
- +Combines deterministic proofreading with generative drafting and task-specific writing agents in one tool
- -Core behavior is inline suggestions, not autonomous action; the 'agents' are supervised and task-scoped
- -Generative and detection features (rewrites, plagiarism, AI detection) are gated behind paid tiers
ProWritingAid
- +Deep, author-focused editing reports (pacing, dialogue, sentence variety, overused words) that go well beyond basic grammar checking
- +Works inside the tools writers actually use, including Microsoft Word, Google Docs, Scrivener, and the browser
- +Lifetime license option and relatively low annual pricing compared to subscription-only rivals
- -Core behavior is suggestions and reports, not autonomous action; the user applies every change
- -Best value features (unlimited reports, manuscript critique, more Sparks) are gated behind paid tiers
Which should you choose?
Grammarly is ai writing assistant that checks, rewrites, and drafts across 1m+ apps and sites, best for consumers, smb, mid-market, enterprise. ProWritingAid is grammar, style, and manuscript-editing assistant for authors and long-form writers, best for consumers, smb. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.
This comparison is generated from the sourced Grammarly and ProWritingAid profiles. Open either profile to review its evidence and last-reviewed date.