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Grammarly AI vs Microsoft 365 Copilot: Complete Comparison 2026

Choosing between Grammarly AI and Microsoft 365 Copilot? We compare both tools across features, pricing, pros and cons to help you decide which is the better fit in 2026.

Grammarly AI8.3

Grammarly · Writing

Grammarly AI extends the popular writing assistant with generative features for drafting, rewriting and adjusting tone anywhere you type. Its GrammarlyGO and editor work across the web, documents and email with real-time grammar, clarity and style suggestions. Grammarly's strength is ubiquitous, context-aware writing help rather than long-form generation.

Microsoft 365 Copilot8.3

Microsoft · Productivity, Writing

Microsoft 365 Copilot embeds AI across Word, Excel, PowerPoint, Outlook and Teams to draft, analyse and summarise using your work data. It's the default AI layer for Microsoft-centric enterprises.

Key differences at a glance

  • •Grammarly AI has a free tier; Microsoft 365 Copilot does not.
  • •Grammarly AI leans on works everywhere you write.
  • •Microsoft 365 Copilot leans on deep office integration.

Side-by-side comparison

FeatureGrammarly AIGrammarlyMicrosoft 365 CopilotMicrosoft
Quality score8.3 / 108.3 / 10
Starting price$12/mo$30/mo
Free tierYes — Free tier availableNo
API input price——
API output price——
SpeedFast—
Context window——
CategoriesWritingProductivity, Writing
Key features
  • Real-time grammar and clarity checks
  • Generative drafting and rewriting
  • Tone and style adjustment
  • Works across apps and browsers
  • Drafting in Word and Outlook
  • Excel analysis and formulas
  • PowerPoint generation
  • Teams meeting recaps
Pros
  • + Works everywhere you write
  • + Excellent editing and tone tools
  • + Solid free tier
  • + Deep Office integration
  • + Works on your real data
  • + Enterprise security
Cons
  • − Limited long-form generation
  • − Best features behind paywall
  • − Premium per-seat price
  • − Requires M365 ecosystem

Grammarly AI

Choose Grammarly AI if you want works everywhere you write and a free tier to start.

Microsoft 365 Copilot

Choose Microsoft 365 Copilot if you want deep office integration.

Pricing comparison

Grammarly AI
$12/mo
Microsoft 365 Copilot
$30/mo

The verdict

Overall, Grammarly AI edges ahead with a quality score of 8.3 versus 8.3 for Microsoft 365 Copilot. Choose Grammarly AI if you want works everywhere you write. That said, Microsoft 365 Copilot is the better pick when deep office integration matters most — so the right answer depends on your priorities and budget.

Try Grammarly AI →Try Microsoft 365 Copilot →

Frequently asked questions

Q. Which is better, Grammarly AI or Microsoft 365 Copilot?

On our scoring, Grammarly AI edges ahead (8.3/10), but the right pick depends on your priorities and budget — see the breakdown above.

Q. Is Grammarly AI or Microsoft 365 Copilot cheaper?

Grammarly AI has a free tier, so it's cheaper to start. Microsoft 365 Copilot begins at $30/mo.

Q. Can I use Grammarly AI and Microsoft 365 Copilot together?

Yes — many teams use more than one AI tool, picking Grammarly AI for some tasks and Microsoft 365 Copilot for others where it's stronger.