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Disclaimer: Star Stack provides information about European technology services for educational purposes only. Service listings, sovereignty assessments, and recommendations do not constitute legal, financial, or professional advice. We encourage you to verify all information independently and consult appropriate professionals before making technology decisions. Star Stack is not affiliated with any listed services unless explicitly stated.

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ProtonMail | Star Stack

Services
ProtonMail

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ProtonMail

Name: ProtonMail
Author: Star Stack

Swiss-based encrypted email service with zero-access architecture

Email (Transactional)

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About

Proton Mail is an encrypted email service that uses end-to-end and zero-access encryption to ensure only the user can read messages. It is designed for users who require privacy by default and want to avoid data scanning or tracking by third parties.

Resources

No migration guide is currently listed for this service.

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Sovereignty Score

Recorded assessment version: jurisdiction-ownership-2026-10-04

out of 100

Data completeness64% (Partial)

Jurisdictional(56%)

Strong EU base with minimal foreign legal exposure

Jurisdiction: Luxembourg (EFTA member)
Parent provider: Proton Financial AG (Switzerland)

Ownership(44%)

Strong EU ownership and control

Bootstrapped (self-funded)
Funding: Self-funded, Proton Foundation
Bootstrapped stage
Low acquisition risk (bootstrapped, no investor pressure) (No VC exit timeline, founders retain full control)

More dimensions coming soon

GovernanceComing soon

PortabilityComing soon

LicenseComing soon

CommunityComing soon

How missing data affects scores Submit data corrections

Provider

Proton AG

Quick Facts

Legal jurisdiction: Switzerland, EFTA
Headquarters: Switzerland, EFTA
Ownership: Bootstrapped
License: GPL-3.0
Funding: Self-funded, Proton Foundation

Evidence and freshness

Last verified: 22/01/2026

A score is an assessment of recorded facts. Missing evidence and unresolved ownership can affect the result.

hqCountry: company registry
Retrieved 22/01/2026, confidence 100%.
Read evidence excerpt
CHE-354.686.492, Plan-les-Ouates, Geneva
Ownership: other
Statement 12/02/2026, confidence 90%.
Read evidence notes
From enrichment pipeline 2026-02-06_03-32-59_c6_v20-validation
Ownership: other
Statement 12/02/2026, confidence 80%.
Ownership: other
Statement 12/02/2026, confidence 90%.
Read evidence notes
From enrichment pipeline 2026-02-06_03-32-59_c6_v20-validation