ProtonCalendar takes a comprehensive approach to user data security. No other calendar keeps as much data private as ProtonCalendar. As our thorough security model demonstrates, we worked hard to ensure that you have all the convenience you need from a calendar app along with the security and privacy you expect from Proton.
With ProtonCalendar, you can now quickly arrange your life and plan your events in a convenient, secure way. It uses the same end-to-end encryption that 
ProtonMail does, ensuring that no one, not even ProtonMail, can access your schedule except you. More Info »
Currently, you can use the ProtonCalendar beta to create and delete events, set reminders, and have your events repeat every day, week, or month.
The current iteration of ProtonCalendar is an early beta. There will be substantial developments between now and when the project is publicly released. Over the course of the beta, additional features will be added such as the ability to share your calendar with other ProtonMail users and send event invites to anyone, even non-ProtonMail users. It will also make scheduling as easy as a single click by letting you sync events in your ProtonMail inbox with ProtonCalendar.
