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.