Proton Calendar

Proton Calendar: Free and Open Source Calendar App

A free calendar app prioritizing privacy and security, offering customizable reminders, guest invitations, event coloring, and accessibility features.

What is Proton Calendar?

Proton Calendar is a free and open source calendar application developed by Proton Technologies AG, the company behind privacy-focused services like ProtonMail and ProtonVPN. It launched in 2022 as part of Proton's vision to create an integrated ecosystem of online services with a strong emphasis on security and privacy protections.

Like Proton's other offerings, Proton Calendar utilizes end-to-end encryption to safeguard user calendars and event data. Events, tasks, and associated details are encrypted before they are transmitted and saved, ensuring that no third parties, including Proton itself, can access the content. Users control the encryption keys.

In addition to its security features, Proton Calendar provides all the key features users expect from a modern calendar service. This includes the ability to create and manage events, set reminders, create tasks with due dates, customize event colors, invite guests, get accessibility assistance, integrate with other calendars, and subscribe to public calendars. It offers apps for iOS and Android mobile devices in addition to its web app.

By positioning itself as an alternative to platforms like Google Calendar and Microsoft Outlook, Proton is hoping to attract privacy-conscious users such as activists, journalists, and businesses dealing in sensitive data. Though relatively new, Proton Calendar aims to provide robust and user-friendly calendar management focused on safety and privacy first.

Proton Calendar Features

Official Links