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Head-to-Head Comparison
Microsoft Copilot vs Grammarly
An honest, side-by-side breakdown of pricing, features, and security — so you can pick the right tool.
Published Last updated
- Microsoft Copilot is cheaper to start — £6/mo versus £10/mo for Grammarly.
- On privacy, Microsoft Copilot offers GDPR compliance where Grammarly does not.
- Microsoft Copilot is best for businesses needing enterprise-ready AI chat; Grammarly for teams building AI writing into their products.
Microsoft Copilot
AI Chatbot
7.8/ 10
Free · Free tier
Best for businesses needing enterprise-ready AI chat
Visit Microsoft CopilotSee all AI Chatbots →G
Grammarly
AI Writing
8.1/ 10
Free · Free tier
Best for teams building AI writing into their products
Visit GrammarlySee all AI Writing Tools →Some “Visit” links are affiliate links. How we earn →
Feature comparison
| Feature | Microsoft Copilot | Grammarly |
|---|---|---|
| CompareMyAI score | 7.8 / 10 | 8.1 / 10 |
| Free tier | ||
| API access | ||
| Open source | ||
| Enterprise ready | ||
| GDPR compliant | ||
| Vendor holds SOC 2 | ||
| Vendor holds ISO 27001 | ||
| MFA supported | ||
| Trains on your data | Yes |
Certifications may only cover business or enterprise plans. Check the vendor’s trust page for your plan.
Grammarly comes out ahead — and you can try it free.
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Pricing
Price checked with vendor on
FreeFree
Enterprise—
G
Always check the provider's site for the latest pricing.
Pros & cons
Microsoft Copilot
Pros
- +Built into Microsoft 365
- +Strong enterprise security and compliance
- +SOC2 and GDPR certified
- +No separate subscription if you have M365
Cons
- −Limited standalone value outside Microsoft ecosystem
- −Less capable than ChatGPT or Claude for general tasks
- −Requires M365 licence
Grammarly
Pros
- +SOC 2 Type II and ISO 27001 certified — strongest compliance in the writing category
- +Works across browser, desktop, Word, Google Docs, and email with one install
- +Pro tier confirmed at £10/mo in GBP — transparent UK pricing
- +Explicit opt-out from AI model training available in account settings
Cons
- −Trains on user writing by default — opt-out required
- −GDPR compliance not explicitly confirmed on accessed official pages
- −Free AI prompt limit (100/mo) may feel restrictive for daily users
Our take— Grammarly wins
Based on our comparison of published pricing, features, and compliance data, Grammarly pulls ahead with API access. Microsoft Copilot counters with GDPR compliance. Grammarly scores 8.1/10 to Microsoft Copilot's 7.8/10. Pick Grammarly if you need API access; pick Microsoft Copilot if GDPR compliance matters.
Frequently asked questions
Which is cheaper, Microsoft Copilot or Grammarly?
Microsoft Copilot is cheaper to start, with its lowest paid plan at £6/mo versus £10/mo for Grammarly. These are each vendor's published prices and can change, so check before you buy.
Does Microsoft Copilot train on your data?
Based on published vendor information, Microsoft Copilot does not train its models on your data. Policies can differ by plan and change over time, so it is worth confirming the current terms on the vendor's site.
Does Grammarly train on your data?
Based on published vendor information, Grammarly may use your data to help train its models. Training is sometimes opt-out, or switched off on paid and business plans, so review the privacy settings in your account.
Are Microsoft Copilot and Grammarly GDPR compliant?
Microsoft Copilot states it is GDPR compliant, while Grammarly is not recorded as GDPR compliant in our data. Confirm the current position with each vendor if GDPR compliance is important for your use.
Do Microsoft Copilot and Grammarly have a free tier?
Yes — both Microsoft Copilot and Grammarly offer a free tier, so you can try each one before committing to a paid plan. Free tiers usually come with usage limits.