Grammarly

AI writing assistant for grammar, style, clarity, and generative content creation

Microsoft Copilot

AI assistant embedded across Microsoft 365 apps

Grammarly

Strong

17/25

Microsoft Copilot

Strong

20/25

Score Breakdown

DimensionGrammarlyMicrosoft Copilot

Data Residency

Where is your data stored and processed?

Grammarly: Data hosted exclusively in US AWS East; no EU or regional residency option

Microsoft Copilot: Microsoft offers data residency across multiple global regions including US, EU, UK, and Asia Pacific. Customers can select their data location and data stays within the Microsoft 365 compliance boundary.

2/5

Data hosted exclusively in US AWS East; no EU or regional residency option

4/5

Microsoft offers data residency across multiple global regions including US, EU, UK, and Asia Pacific. Customers can select their data location and data stays within the Microsoft 365 compliance boundary.

Legal Jurisdiction

Which laws govern the company and your data?

Grammarly: US Delaware corporation subject to CLOUD Act; GDPR compliance via SCCs and DPA

Microsoft Copilot: Incorporated in Washington State, US. Subject to US laws including the CLOUD Act. Microsoft has challenged government data requests and offers EU Data Boundary commitments.

2/5

US Delaware corporation subject to CLOUD Act; GDPR compliance via SCCs and DPA

3/5

Incorporated in Washington State, US. Subject to US laws including the CLOUD Act. Microsoft has challenged government data requests and offers EU Data Boundary commitments.

Data Retention & Training

Is your data used for model training?

Grammarly: User data not sold; limited processing for product improvement with user controls

Microsoft Copilot: Copilot interactions inherit Microsoft 365 retention policies. Administrators have granular control over data retention, deletion, and eDiscovery. Copilot prompts and responses are stored in Exchange Online.

4/5

User data not sold; limited processing for product improvement with user controls

4/5

Copilot interactions inherit Microsoft 365 retention policies. Administrators have granular control over data retention, deletion, and eDiscovery. Copilot prompts and responses are stored in Exchange Online.

Certifications

ISO 27001, SOC 2, Cyber Essentials, etc.

Grammarly: Extensive certification: SOC 2 Type II, ISO 27001/18/701, ISO 42001

Microsoft Copilot: One of the most extensively certified cloud platforms globally, holding SOC 1/2 Type II, ISO 27001, ISO 27018, ISO 27701, FedRAMP High, and dozens of additional certifications across regions and industries.

5/5

Extensive certification: SOC 2 Type II, ISO 27001/18/701, ISO 42001

5/5

One of the most extensively certified cloud platforms globally, holding SOC 1/2 Type II, ISO 27001, ISO 27018, ISO 27701, FedRAMP High, and dozens of additional certifications across regions and industries.

Regulatory Fit

Suitability for regulated industries and professional services

Grammarly: Strong enterprise compliance posture; US-only hosting limits suitability for EU data residency mandates

Microsoft Copilot: Supports a vast range of regulatory frameworks including GDPR, HIPAA, FedRAMP, FERPA, and many industry-specific requirements. Government cloud offerings available for public sector customers.

4/5

Strong enterprise compliance posture; US-only hosting limits suitability for EU data residency mandates

4/5

Supports a vast range of regulatory frameworks including GDPR, HIPAA, FedRAMP, FERPA, and many industry-specific requirements. Government cloud offerings available for public sector customers.

Total Score

17/25

20/25

Best For

Grammarly

Best for organisations requiring broad certification coverage (SOC 2 Type II, ISO 27001, ISO 27018); privacy-conscious teams who need strong data retention controls; teams on a tight budget.

Microsoft Copilot

Best for organisations requiring broad certification coverage (SOC 1 Type II, SOC 2 Type II, ISO 27001); privacy-conscious teams who need strong data retention controls.

Detailed Comparison

Grammarly vs Microsoft Copilot: Trust & Compliance Comparison

Grammarly (Grammarly, Inc., US) scores 17/25 overall with a Silver (Strong) trust badge. AI writing assistant for grammar, style, clarity, and generative content creation. Microsoft Copilot (Microsoft, US) scores 20/25 with a Silver (Strong) trust badge. AI assistant embedded across Microsoft 365 apps.

Dimension-by-Dimension Breakdown

#### Data Residency

Microsoft Copilot leads with 4/5 vs 2/5.

●Grammarly (2/5): Data hosted exclusively in US AWS East; no EU or regional residency option

●Microsoft Copilot (4/5): Microsoft offers data residency across multiple global regions including US, EU, UK, and Asia Pacific. Customers can select their data location and data stays within the Microsoft 365 compliance boundary.

#### Legal Jurisdiction

Microsoft Copilot leads with 3/5 vs 2/5.

●Grammarly (2/5): US Delaware corporation subject to CLOUD Act; GDPR compliance via SCCs and DPA

●Microsoft Copilot (3/5): Incorporated in Washington State, US. Subject to US laws including the CLOUD Act. Microsoft has challenged government data requests and offers EU Data Boundary commitments.

#### Data Retention & Training

Both score equally at 4/5.

●Grammarly (4/5): User data not sold; limited processing for product improvement with user controls

●Microsoft Copilot (4/5): Copilot interactions inherit Microsoft 365 retention policies. Administrators have granular control over data retention, deletion, and eDiscovery. Copilot prompts and responses are stored in Exchange Online.

#### Certifications

Both score equally at 5/5.

●Grammarly (5/5): Extensive certification: SOC 2 Type II, ISO 27001/18/701, ISO 42001

●Microsoft Copilot (5/5): One of the most extensively certified cloud platforms globally, holding SOC 1/2 Type II, ISO 27001, ISO 27018, ISO 27701, FedRAMP High, and dozens of additional certifications across regions and industries.

#### Regulatory Fit

Both score equally at 4/5.

●Grammarly (4/5): Strong enterprise compliance posture; US-only hosting limits suitability for EU data residency mandates

●Microsoft Copilot (4/5): Supports a vast range of regulatory frameworks including GDPR, HIPAA, FedRAMP, FERPA, and many industry-specific requirements. Government cloud offerings available for public sector customers.

Certifications at a Glance

Certification	Grammarly	Microsoft Copilot
FedRAMP High	No	Yes
ISO 27001	Yes	Yes
ISO 27018	Yes	Yes
ISO 27701	Yes	Yes
ISO 42001	Yes	No
SOC 1 Type II	No	Yes
SOC 2 Type II	Yes	Yes

Overall Verdict

Microsoft Copilot has a clear trust advantage, scoring 20/25 compared to Grammarly's 17/25. Microsoft Copilot particularly excels in data residency, legal jurisdiction.

Frequently Asked Questions

Which is better for EU compliance, Grammarly or Microsoft Copilot?

Grammarly has a TrustKit score of 17/25 while Microsoft Copilot scores 20/25. Microsoft Copilot currently rates higher across data residency, legal jurisdiction, data retention, certifications, and regulatory fit.

How do Grammarly and Microsoft Copilot compare on data residency?

Grammarly scores 2/5 for data residency (Data hosted exclusively in US AWS East; no EU or regional residency option), while Microsoft Copilot scores 4/5 (Microsoft offers data residency across multiple global regions including US, EU, UK, and Asia Pacific. Customers can select their data location and data stays within the Microsoft 365 compliance boundary.).

Are Grammarly and Microsoft Copilot GDPR compliant?

Both tools are assessed across five compliance dimensions. Grammarly has a regulatory fit score of 4/5 and Microsoft Copilot scores 4/5. Check the full comparison above for a detailed breakdown.

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