ProtonCalendar is described as 'A secure calendar designed to be paired with the equally secure ProtonMail service' and is an website in the Office & Productivity category. There are nine alternatives to ProtonCalendar, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and Android. The best alternative is Google Calendar, which is free. Other great sites and apps similar to ProtonCalendar are Lightning Calendar (Free, Open Source), Rainlendar (Freemium), Nextcloud Calendar (Free, Open Source) and Calendar (Free).
- 9 alternatives