Calendar services · File hosting services

Proton Calendar

Name: Proton Calendar
Author: Proton Calendar

Encrypted calendar from Switzerland

SwitzerlandEFTAEFTA hostedEU controlled

Visit website proton.me

Proton Calendar is a calendar service from the Swiss company Proton with a strong focus on privacy. It uses zero-knowledge encryption, which means the company cannot read the contents of your calendar even though the entries are stored on its servers.

The service is hosted in Switzerland and falls under Swiss privacy law, which makes it a European alternative to the calendars bundled with American office suites. It fits people already using other Proton products and anyone who treats their schedule as sensitive information.

External verification

EU verification badge

eu-alt.eu independently verified this service's European ownership. Choose a badge style and link it back to the dated evidence on this page.

Evidence last checked: 2026-09-04

Horizontal · Blue

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<a href="https://eu-alt.eu/en/product/proton-calendar" rel="nofollow"><img src="https://eu-alt.eu/badges/proton-calendar/ownership-blue.svg" alt="Proton Calendar: EU ownership independently verified by eu-alt.eu" width="360" height="96" loading="lazy"></a>

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<a href="https://eu-alt.eu/en/product/proton-calendar" rel="nofollow"><img src="https://eu-alt.eu/badges/proton-calendar/ownership-black.svg" alt="Proton Calendar: EU ownership independently verified by eu-alt.eu" width="360" height="96" loading="lazy"></a>

Horizontal · White

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<a href="https://eu-alt.eu/en/product/proton-calendar" rel="nofollow"><img src="https://eu-alt.eu/badges/proton-calendar/ownership-white.svg" alt="Proton Calendar: EU ownership independently verified by eu-alt.eu" width="360" height="96" loading="lazy"></a>

Compact · Blue

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<a href="https://eu-alt.eu/en/product/proton-calendar" rel="nofollow"><img src="https://eu-alt.eu/badges/proton-calendar/ownership-compact-blue.svg" alt="Proton Calendar: EU ownership independently verified by eu-alt.eu" width="220" height="132" loading="lazy"></a>

Compact · Black

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<a href="https://eu-alt.eu/en/product/proton-calendar" rel="nofollow"><img src="https://eu-alt.eu/badges/proton-calendar/ownership-compact-black.svg" alt="Proton Calendar: EU ownership independently verified by eu-alt.eu" width="220" height="132" loading="lazy"></a>

Compact · White

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<a href="https://eu-alt.eu/en/product/proton-calendar" rel="nofollow"><img src="https://eu-alt.eu/badges/proton-calendar/ownership-compact-white.svg" alt="Proton Calendar: EU ownership independently verified by eu-alt.eu" width="220" height="132" loading="lazy"></a>

Data and operations

Infrastructure and email path

Verified operational dependencies, shown separately from ownership and from the service's core data hosting.

Public website

Proton

European provider

Observed: A 185.70.42.45 · AS62371
Evidence: Live website DNS ↗RIPE network record ↗

Incoming business email

Proton Mail

European provider

Observed: MX 10 mail.protonmail.ch · 20 mailsec.protonmail.ch
Evidence: Current daily MX lookup ↗

Authorised outbound email

Proton Mail

European provider

Observed: SPF _spf.protonmail.ch
Evidence: Live SPF record ↗

Public DNS records identify visible providers and routes, not every backend location or private data-region setting.

Infrastructure checked: 2026-09-04

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