A Modern Calendar Built for Clarity and Control
I’ve struggled with keeping several calendars for many years. I have one for my personal appointments, one for work, and today, I added a new calendar to keep track of my dad’s physical therapy appointments. He just recently had knee surgery and I’m helping my mom with transporting him home after the appointments since she has to be at work. So, I wanted to see those appointments separated from my other ones so that I could determine which ones I could make outside of my set schedule. While most calendar programs allow for multiple calendars, I didn’t want to muddy my work calendar with personal appointments or vice-versa. So, I set up Proton Calendar to help me organize my schedule.
About Proton Calendar
Proton Calendar is a privacy-focused scheduling tool developed by Proton, the company behind Proton Mail and other secure online services. Designed with end-to-end encryption at its core, Proton Calendar ensures that your personal events, appointments, and daily plans remain visible only to you. Built for users who value privacy without compromising functionality, it offers a sleek interface, cross-platform support, and essential calendar features like reminders, recurring events, and multiple calendar management. Whether you’re organizing your workweek or planning a vacation, Proton Calendar aims to provide a secure, intuitive, and ad-free experience.
Proton Calendar is designed to work seamlessly with other Proton services. If you’re already using Proton Mail, for instance, you can easily add events directly from your inbox, such as when you receive an email with an event or meeting invitation. This creates a cohesive ecosystem for users who value security across all their online activities.
Proton is headquartered in Switzerland, a country known for its strong privacy laws, which ensures that Proton’s services remain outside the reach of intrusive surveillance or data requests. The company was founded by scientists from CERN (European Organization for Nuclear Research) with a mission to create secure, encrypted communication tools that respect users’ privacy.
Tech Stack
Proton Calendar is built using a modern, secure, and privacy-focused tech stack aligned with Proton’s overall infrastructure. According to Proton’s open-source repositories and developer documentation, here’s a general breakdown of the technologies used or likely used to build Proton Calendar.
Backend
Language: Go (Golang) — Proton uses Go extensively across their services for backend APIs and micro-services. Frameworks: Custom-built or lightweight Go-based frameworks for performance and security. Database: PostgreSQL — commonly used in Proton’s stack. Authentication & Encryption: OpenPGP-based end-to-end encryption, Zero-access architecture (Proton cannot read your calendar data). APIs: RESTful APIs, sometimes GraphQL (though REST is more prevalent in their public APIs).Frontend (Web)
Language: TypeScript & JavaScript Framework: React (for the web app UI) — Proton’s web apps are React-based. State Management: Redux or custom context/state logic. Styling: SCSS/CSS Modules with BEM naming conventions, Proton also has its own UI toolkit.Mobile
Platforms: iOS and Android iOS: Swift Android: Kotlin Mobile Framework: Native development (no Flutter/React Native — Proton favors full native apps for performance/security)Security Infrastructure
Encryption: OpenPGP, using libraries like OpenPGP.js (for client-side encryption in the browser) Key Management: Zero-access encryption means calendar data is encrypted on the client before it’s sent to Proton servers. Open Source: Proton Calendar’s front-end code is open source on GitHub, allowing for transparency and community auditing.Main Features
End-to-End Encryption: Ensures complete privacy of your calendar data. Multiple Calendar Support: Manage personal, work, and shared calendars. Event Scheduling: Add events with details like time, location, and descriptions. Recurring Events: Set up daily, weekly, monthly, or custom recurring events. Time Zone Support: Automatically adjusts event times based on your time zone. Sync Across Devices: Keeps your calendar updated on web, iOS, and Android. Simple and Clean Interface: Minimalist design with Day, Week, and Month views. Event Reminders and Notifications: Set reminders for events and receive notifications. Integration with Proton Mail: Add events directly from Proton Mail emails. Public Event Links (Beta): Share events with non-Proton users using public links. Cross-Platform Accessibility: Available on web, iOS, and Android. Privacy-Focused Design: No ads, no tracking, and no data collection. Open Source Code: Transparent, open-source code for community review. Customizable Appearance: Personalize your calendar’s look with themes and colors.Pricing and Availability
Proton Calendar is packaged together with Proton Mail. There are paid plans available for individuals, families, and businesses, but a single user can use Proton Mail and Calendar for free (with no credit card required). Here is what you get with each of the individual plan levels.
Free $0.00 / monthMail Plus $4.99 / monthProton Unlimited $12.99 / monthProton Duo $19.99 / monthPersonal Calendars3252550End-to-end encryption✅✅✅✅Calendar sharing✅✅✅Send and receive invitations✅✅✅✅Proton Calendar can be accessed using a web browser, desktop app, or mobile app. The different operating systems that Proton Calendar is compatible with are listed below.
macOS (part of Proton Mail) iOS Android Windows (part of Proton Mail) Linux (beta)(part of Proton Mail)Privacy Policy
Proton’s privacy policy prioritizes user privacy by ensuring that all data is encrypted end-to-end, with no third-party access, and by operating with a strict no-ads, no-tracking policy to protect users’ personal information. The full privacy policy can be found here: proton.me/legal/privacy
User Experience
When I set up my Proton Calendar, I had a very specific use-case in mind. I started with the web browser version for populating the calendar. I imported .ics files for my existing work and personal calendars. Each calendar became its own new calendar inside Proton Calendar. Then, I made a third calendar to record my dad’s PT appointments. This made it possible for me to see how all the appointments lined up without any overlap or confusion.
After I had all the events set up, I moved over to the Mac App, which is part of Proton Mail. I didn’t have any issues with syncing between the different versions. Everything transferred over exactly how I expected. The Mac App works similarly to Apple Calendar, but it’s better. Honestly, Proton Calendar feels like a combination between Outlook, Apple Calendar, and Google Calendar—wrapped in a privacy-first package. It has the flexibility and polish of the mainstream options, but without the distractions or data concerns.
The iOS app mirrors the desktop experience beautifully. I have full functionality and a clean layout with fast sync that gives Proton Calendar a native, polished feel. Whether I’m adding appointments from my phone or checking my schedule on the go, everything stays up-to-date across devices. The reminder system works exactly as I need it to—notifications come through reliably on both desktop and mobile, and you have full control over how you want to be reminded. You can receive a pop-up notification, an email, or both. At first, I had both options turned on, but I quickly realized that getting email reminders for everything became overwhelming. Turning off email reminders gave me the balance I needed.
Each calendar has its own color that you can select, and it makes a big difference. With just a glance, I know whether something is work-related, personal, or related to my dad’s physical therapy. It gives a visual clarity that helps me mentally segment my day. When events pass, they fade to a light gray while upcoming events stay bold and colorful. It’s a subtle touch, but it really keeps the most relevant information front and center without cluttering the view.
Another small but meaningful detail is how lightweight and fast everything feels. There’s no lag, no pop-ups, and no junk getting in the way. It’s clear that Proton designed this calendar for people who want simplicity, security, and efficiency. For someone managing multiple responsibilities across different areas of life, Proton Calendar has genuinely helped me feel more organized—and more in control.
Conclusion
Proton Calendar might not be the first name that comes to mind when people think of digital calendars—but maybe it should be. With a strong focus on privacy, an intuitive interface, and seamless syncing across platforms, it offers a refreshing alternative to ad-driven tools like Google Calendar. For those juggling multiple aspects of life—like personal responsibilities, work, and caregiving—Proton Calendar creates a clean, focused space to manage it all. It respects your data, keeps things visually simple, and just works. If you’re already within the Proton ecosystem, it’s a no-brainer. Even if you’re not, it’s worth considering if you’re ready to declutter your calendar and take back control of your schedule.
For more information, visit proton.me/calendar
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