Head to head · Productivity · updated Oct 15, 2026
Grammarly vs Microsoft Copilot
Grammarly scores 25 to Microsoft Copilot's 25 on public evidence for email writing & inbox management, and they rank #2 and #3 there. Both are free to start. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
Grammarly
A writing assistant that checks grammar, tone and clarity everywhere you type and rewrites or drafts text on request.
+ Works in nearly every text field on every platform, so corrections and tone suggestions follow you into Gmail, Slack and Word.
− Suggestions can flatten a distinctive voice and the premium nag prompts in the free tier are constant.
Microsoft Copilot
Microsoft's assistant, free on the web and Windows, and embedded in Word, Excel, PowerPoint, Outlook and Teams with Microsoft 365 Copilot.
+ Works inside the Office apps you already use, drafting Outlook replies, summarizing Teams meetings and turning Word docs into PowerPoint decks.
− Results inside Excel and PowerPoint are often shallow compared with the standalone chat, which makes the $30 business seat hard to justify.
Side by side
public evidence| Grammarly | Microsoft Copilot | |
|---|---|---|
| Evidence score / 100 | 25 | 25 |
| GitHub stars | closed source | closed source |
| Hacker News stories, 30d | 3 | 3 |
| Release-feed mentions, 30d | 0 | 0 |
| Last activity | – | – |
| Pricing | Free tier · Pro from $12/mo billed annually | Free tier · Copilot Pro $20/mo; Microsoft 365 Copilot $30/user/mo |
| Platforms | web, mac, windows, ios, android, chrome-extension | web, windows, mac, ios, android |
| Maker | Grammarly | Microsoft |
Which one?
Pick Grammarly if
- you need it on chrome-extension
Best for everyday grammar and tone checking.
Pick Microsoft Copilot if
Works inside the Office apps you already use, drafting Outlook replies, summarizing Teams meetings and turning Word docs into PowerPoint decks.
Best for Microsoft 365 organizations.