Langdock

GDPR-compliant enterprise AI platform for chat, assistants, and workflow automation

Lumo (Proton)

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

Langdock

Excellent

24/25

Lumo (Proton)

Excellent

23/25

Score Breakdown

DimensionLangdockLumo (Proton)

Data Residency

Where is your data stored and processed?

Langdock: All data hosted in the EU by default; self-hosting option available for maximum control

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.

5/5

All data hosted in the EU by default; self-hosting option available for maximum control

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?

Langdock: German GmbH under EU law; fully GDPR-native architecture with no CLOUD Act exposure

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.

5/5

German GmbH under EU law; fully GDPR-native architecture with no CLOUD Act exposure

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?

Langdock: Customer data never used for AI training; full data deletion on request

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

5/5

Customer data never used for AI training; full data deletion on request

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.

Langdock: ISO 27001 certified and SOC 2 Type II audited

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.

4/5

ISO 27001 certified and SOC 2 Type II audited

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

Langdock: Ideal for EU-regulated organisations; EU hosting, German jurisdiction, GDPR-native, and strong certifications

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.

5/5

Ideal for EU-regulated organisations; EU hosting, German jurisdiction, GDPR-native, and strong certifications

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

24/25

23/25

Best For

Langdock

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

Lumo (Proton)

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.

Detailed Comparison

Langdock vs Lumo (Proton): Trust & Compliance Comparison

Langdock (Langdock GmbH, DE) scores 24/25 overall with a Gold (Excellent) trust badge. GDPR-compliant enterprise AI platform for chat, assistants, and workflow automation. Lumo (Proton) (Proton, CH) scores 23/25 with a Gold (Excellent) trust badge. Privacy-first AI assistant from the makers of ProtonMail, with Swiss jurisdiction and zero-access encryption.

Dimension-by-Dimension Breakdown

#### Data Residency

Both score equally at 5/5.

●Langdock (5/5): All data hosted in the EU by default; self-hosting option available for maximum control

●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.

#### Legal Jurisdiction

Both score equally at 5/5.

●Langdock (5/5): German GmbH under EU law; fully GDPR-native architecture with no CLOUD Act exposure

●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.

#### Data Retention & Training

Both score equally at 5/5.

●Langdock (5/5): Customer data never used for AI training; full data deletion on request

●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.

#### Certifications

Both score equally at 4/5.

●Langdock (4/5): ISO 27001 certified and SOC 2 Type II audited

●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.

#### Regulatory Fit

Langdock leads with 5/5 vs 4/5.

●Langdock (5/5): Ideal for EU-regulated organisations; EU hosting, German jurisdiction, GDPR-native, and strong certifications

●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.

Certifications at a Glance

Certification	Langdock	Lumo (Proton)
ISO 27001	Yes	Yes
SOC 2	No	Yes
SOC 2 Type II	Yes	No

Overall Verdict

Langdock and Lumo (Proton) are closely matched on trust and compliance, with scores of 24/25 and 23/25 respectively. The right choice depends on your specific regulatory requirements and existing technology stack.

Frequently Asked Questions

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

Langdock has a TrustKit score of 24/25 while Lumo (Proton) scores 23/25. Langdock currently rates higher across data residency, legal jurisdiction, data retention, certifications, and regulatory fit.

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

Langdock scores 5/5 for data residency (All data hosted in the EU by default; self-hosting option available for maximum control), 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 Langdock and Lumo (Proton) GDPR compliant?

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

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