Notion AI

AI-powered workspace for notes, wikis, projects, and content generation

Lumo (Proton)

Privacy-first AI assistant from the makers of ProtonMail, with Swiss jurisdiction and zero-access encryption

Notion AI

Strong

20/25

Lumo (Proton)

Excellent

23/25

Score Breakdown

DimensionNotion AILumo (Proton)

Data Residency

Where is your data stored and processed?

Notion AI: EU data residency available for Enterprise customers; US hosting for lower tiers

Lumo (Proton): Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.

4/5

EU data residency available for Enterprise customers; US hosting for lower tiers

5/5

Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.

Legal Jurisdiction

Which laws govern the company and your data?

Notion AI: US Delaware corporation; EU residency option reduces CLOUD Act exposure for Enterprise

Lumo (Proton): Swiss incorporation provides one of the strongest privacy jurisdictions globally. Outside US CLOUD Act reach. Swiss FADP and GDPR adequacy. Proton has a decade-long track record of defending user privacy.

3/5

US Delaware corporation; EU residency option reduces CLOUD Act exposure for Enterprise

5/5

Swiss incorporation provides one of the strongest privacy jurisdictions globally. Outside US CLOUD Act reach. Swiss FADP and GDPR adequacy. Proton has a decade-long track record of defending user privacy.

Data Retention & Training

Is your data used for model training?

Notion AI: Customer data not used to train AI models; data retained per workspace settings

Lumo (Proton): Zero-access encryption on conversations. User data explicitly never used for model training. Open-source code enables independent verification of privacy claims.

4/5

Customer data not used to train AI models; data retained per workspace settings

5/5

Zero-access encryption on conversations. User data explicitly never used for model training. Open-source code enables independent verification of privacy claims.

Certifications

ISO 27001, SOC 2, Cyber Essentials, etc.

Notion AI: SOC 2 Type II, ISO 27001/17/18/701 all certified; AI included in scope

Lumo (Proton): ISO 27001 and SOC 2 at Proton AG organisational level. Strong for a consumer-facing privacy product. ISO 27701 would further strengthen the posture.

5/5

SOC 2 Type II, ISO 27001/17/18/701 all certified; AI included in scope

4/5

ISO 27001 and SOC 2 at Proton AG organisational level. Strong for a consumer-facing privacy product. ISO 27701 would further strengthen the posture.

Regulatory Fit

Suitability for regulated industries and professional services

Notion AI: Strong fit for EU organisations on Enterprise plan with data residency; good overall compliance posture

Lumo (Proton): Excellent fit for privacy-sensitive professionals in legal and financial services. Swiss jurisdiction, zero-access encryption, and no training on user data address key regulatory concerns. Not EU-incorporated but GDPR adequate.

4/5

Strong fit for EU organisations on Enterprise plan with data residency; good overall compliance posture

4/5

Excellent fit for privacy-sensitive professionals in legal and financial services. Swiss jurisdiction, zero-access encryption, and no training on user data address key regulatory concerns. Not EU-incorporated but GDPR adequate.

Total Score

20/25

23/25

Best For

Notion AI

Best for EU-headquartered organisations needing maximum data sovereignty; regulated industries (legal, financial-services); privacy-conscious teams who need strong data retention controls; organisations that need self-hosted or on-premise deployment; teams on a tight budget.

Lumo (Proton)

Best for organisations requiring broad certification coverage (SOC 2 Type II, ISO 27001, ISO 27017); regulated industries (ICO); privacy-conscious teams who need strong data retention controls; teams on a tight budget.

Detailed Comparison

Lumo (Proton) vs Notion AI: Trust & Compliance Comparison

Lumo (Proton) (Proton, CH) scores 23/25 overall with a Gold (Excellent) trust badge. Privacy-first AI assistant from the makers of ProtonMail, with Swiss jurisdiction and zero-access encryption. Notion AI (Notion Labs, Inc., US) scores 20/25 with a Silver (Strong) trust badge. AI-powered workspace for notes, wikis, projects, and content generation.

Dimension-by-Dimension Breakdown

#### Data Residency

Lumo (Proton) leads with 5/5 vs 4/5.

●Lumo (Proton) (5/5): Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.

●Notion AI (4/5): EU data residency available for Enterprise customers; US hosting for lower tiers

#### Legal Jurisdiction

Lumo (Proton) leads with 5/5 vs 3/5.

●Lumo (Proton) (5/5): Swiss incorporation provides one of the strongest privacy jurisdictions globally. Outside US CLOUD Act reach. Swiss FADP and GDPR adequacy. Proton has a decade-long track record of defending user privacy.

●Notion AI (3/5): US Delaware corporation; EU residency option reduces CLOUD Act exposure for Enterprise

#### Data Retention & Training

Lumo (Proton) leads with 5/5 vs 4/5.

●Lumo (Proton) (5/5): Zero-access encryption on conversations. User data explicitly never used for model training. Open-source code enables independent verification of privacy claims.

●Notion AI (4/5): Customer data not used to train AI models; data retained per workspace settings

#### Certifications

Notion AI leads with 5/5 vs 4/5.

●Lumo (Proton) (4/5): ISO 27001 and SOC 2 at Proton AG organisational level. Strong for a consumer-facing privacy product. ISO 27701 would further strengthen the posture.

●Notion AI (5/5): SOC 2 Type II, ISO 27001/17/18/701 all certified; AI included in scope

#### Regulatory Fit

Both score equally at 4/5.

●Lumo (Proton) (4/5): Excellent fit for privacy-sensitive professionals in legal and financial services. Swiss jurisdiction, zero-access encryption, and no training on user data address key regulatory concerns. Not EU-incorporated but GDPR adequate.

●Notion AI (4/5): Strong fit for EU organisations on Enterprise plan with data residency; good overall compliance posture

Certifications at a Glance

Certification	Lumo (Proton)	Notion AI
ISO 27001	Yes	Yes
ISO 27017	No	Yes
ISO 27018	No	Yes
ISO 27701	No	Yes
SOC 2	Yes	No
SOC 2 Type II	No	Yes

Overall Verdict

Lumo (Proton) has a clear trust advantage, scoring 23/25 compared to Notion AI's 20/25. Lumo (Proton) particularly excels in data residency, legal jurisdiction, data retention & training.

Frequently Asked Questions

Which is better for EU compliance, Notion AI or Lumo (Proton)?

Notion AI has a TrustKit score of 20/25 while Lumo (Proton) scores 23/25. Lumo (Proton) currently rates higher across data residency, legal jurisdiction, data retention, certifications, and regulatory fit.

How do Notion AI and Lumo (Proton) compare on data residency?

Notion AI scores 4/5 for data residency (EU data residency available for Enterprise customers; US hosting for lower tiers), while Lumo (Proton) scores 5/5 (Data hosted in Proton's own data centres in Germany and Norway. Zero-access encryption means even Proton cannot read conversation content. No US infrastructure dependency.).

Are Notion AI and Lumo (Proton) GDPR compliant?

Both tools are assessed across five compliance dimensions. Notion AI has a regulatory fit score of 4/5 and Lumo (Proton) scores 4/5. Check the full comparison above for a detailed breakdown.

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