A calendar is more than just a tool. It’s a record of the moments that make up your life — your big meetings, gatherings with friends, and children’s birthdays. For the longest time, to easily organize these events, you had to let large corporations monitor these special moments. These companies snoop on your calendar and use that information to inform their advertising.

ProtonCalendar is the first fully encrypted calendar app. You can use it to keep track of your plans and appointments while keeping your data private.

ProtonCalendar uses end-to-end encryption to keep all your events’ sensitive information private and secure. The event title, description, location, and participants for every event are encrypted on your device before they reach our servers, so that no third party (including ProtonMail) can see the details of your events. Only you will know your plans.

If you are a ProtonMail or ProtonVPN user with a paid plan, you can start using the ProtonCalendar beta right now. Simply log in to your ProtonMail account using the ProtonMail Version 4.0 beta, and you will see ProtonCalendar on the sidebar:

If you don’t have a paid ProtonMail account yet, you can sign up here:

If you don’t see the Calendar icon (below) in the left menu, you might need to refresh the page.

ProtonCalendar takes Proton into the future

It’s no secret that we’re creating privacy-focused alternatives to the online services you use every day. ProtonCalendar is the next step in this process. Our calendar 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.

Our calendar stops private companies from spying on your schedule. For our users with heightened security needs, ProtonCalendar will prevent authoritarian regimes from seeing who you are meeting with and what you are doing. It does this by keeping the details of all your events encrypted while they are stored on our servers. Even in the unlikely event of a breach, your agenda will remain secure.

Currently, you can use the ProtonCalendar beta to manage up to 10 calendars. You can create and delete events, set reminders, and schedule, edit, or delete events that repeat every day, week, month, or on custom days.

ProtonCalendar is just the latest project in our mission to create a more private Internet. A calendar app has been one of our most requested products — pairing a secure calendar with a private inbox dramatically increases the utility of both. And soon, you will be able to privately save and share documents to the cloud with ProtonDrive. Our mission is to create an Internet that serves you and doesn’t require you to hand over your personal data to governments or corporations.

Looking ahead

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.

While ProtonCalendar is only available in the web version of ProtonMail for now, we will also be bringing ProtonCalendar to iOS and Android with dedicated mobile apps in 2020.

While we are excited to release the ProtonCalendar beta today to get initial feedback from the community, we realize there is still work to be done. We look forward to receiving and incorporating your input so that ProtonCalendar can meet all of your calendar needs.

We believe everyone has the right to plan dinner with friends without announcing to Google who will attend. For that reason, once ProtonCalendar is publicly released, a basic version will be available to all ProtonMail users (including Free users) while paid Proton users will benefit from additional functionality.

Your feedback matters

Our community has always been one of our greatest strengths, so we are again turning to you for help. Your feedback will greatly assist us in making improvements to ProtonCalendar, optimizing its design and giving you the private and secure calendar app you want.

During the beta, you can reach us with any feedback on ProtonCalendar via our bug report feature inside the web app.

You can also follow ProtonCalendar development via a dedicated ProtonCalendar Twitter account and the new ProtonCalendar subreddit on Reddit.

Stay organized and protect your schedule from being spied on with ProtonCalendar.

Best Regards,

The Proton Team

You can get a free secure email account from ProtonMail here.

We also provide a free VPN service to protect your privacy.

ProtonMail and ProtonVPN are funded by community contributions. If you would like to support our development efforts, you can upgrade to a paid plan or donate. Thank you for your support.