In short
How they differ.
Worked out from the makers' own pages, read Oct 20, 2026. Prices change; check before you pay.
- Only Grammarly has a free plan.
- Microsoft Copilot in Word's cheapest paid plan is cheaper: $9.99 a month against $12.
- Microsoft Copilot in Word also has a web and phone app and computer app.
- Microsoft Copilot in Word shipped an update more recently (Aug 25, 2026).
Side by side
The details.
| Microsoft Copilot in Word | Grammarly | |
|---|---|---|
| Made by | Microsoft · United States | Superhuman Platform Inc. (formerly Grammarly) · United States |
| What it says it is | “AI-powered tools to draft, edit, and summarize documents and emails1” | “Write without spelling and grammar mistakes.” |
| Free plan | NoCopilot inside the Word desktop apps comes with a Microsoft 365 subscription; a free Microsoft account gets "Limited usage" of Copilot overall. | Yes100 AI prompts per month. |
| Plans | Free (Microsoft account): freeMicrosoft 365 Personal: $9.99 a monthMicrosoft 365 Family: $12.99 a monthMicrosoft 365 Premium: $19.99 a monthMicrosoft 365 Copilot Business (add-on): $18 a monthMicrosoft 365 Business Standard with Copilot: $23.50 a monthMicrosoft 365 Business Premium with Copilot: $32 a month | Free: freePro: $12 a monthEnterprise: not in US$ |
| Runs on | Windows, macOS, web, mobile | Not stated |
| Latest update | Use voice for Q&A during Read Aloud in Word, Aug 25, 2026 | Grammarly Authorship Is Now Available in Blackboard, Aug 13, 2026 |
| Its terms | “If you are logged into Copilot with a Microsoft Account or other third-party authentication, you can control whether your conversation activity is used for training Microsoft's generative AI models.”What it does with your data · Microsoft Support: Privacy FAQ for Microsoft Copilot | “We also use information we collect to train our AI models.”What it does with your data · Superhuman Privacy Policy |
| Disputes | None on file | None on file |
| Sources | Prices, Oct 20, 2026 · Description · company-reported | Prices, Oct 20, 2026 · Description · company-reported |
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