Best Proton Calendar Apps

213+ iOS apps curated and reviewed

4.4 avg rating
20 free apps
Updated May 2026

From beginner-friendly picks to power-user tools, our proton calendar list covers 213+ iPhone apps updated through May 2026. Compare ratings, prices, and screenshots in one place.

Top Picks for Proton Calendar

Proton Calendar: Secure Events#1

Proton Calendar: Secure Events by Proton AG

Keep your schedule private
Editor's Choice
📊 Productivity
4.0😐(1.3K ratings)
FreeIn-App Purchases
Proton Calendar: Secure Events screenshot 1
Proton Calendar: Secure Events screenshot 2
Proton Calendar: Secure Events screenshot 3
Proton Calendar: Secure Events screenshot 4
Proton Calendar: Secure Events screenshot 5
Proton Calendar: Secure Events screenshot 6

A secure calendar application that prioritizes user privacy by offering end-to-end encryption for events and invites. Keep your schedule organized and private with features like multiple reminders, recurring events, and synchronization across devices. Built by scientists and engineers from CERN and MIT, Proton Calendar is ad-free and funded by users, not advertisers. Join the privacy-focused community today.

What We Love

  • 🚀 Intuitive interface
  • 🔒 Secure and private
  • 👍 Good integration with Proton suite
  • 👍 Visually appealing design

Room to Improve

  • 🐛 Slow performance and crashes
  • 🔍 Lacking search functionality
  • 📅 Missing advanced calendar views (week, month)
Proton Drive: Cloud Storage#2

Proton Drive: Cloud Storage by Proton AG

Private files & photos backup
Strong Contender
📊 Productivity
4.1😐(965 ratings)
FreeIn-App Purchases
Proton Drive: Cloud Storage screenshot 1
Proton Drive: Cloud Storage screenshot 2
Proton Drive: Cloud Storage screenshot 3
Proton Drive: Cloud Storage screenshot 4
Proton Drive: Cloud Storage screenshot 5
Proton Drive: Cloud Storage screenshot 6

"Get secure and convenient cloud storage for all your files with our easy-to-use application. Safely store, access, and share your important documents anytime, anywhere."

What We Love

  • 🚀 Fast and efficient
  • 🔒 Secure and private
  • 👍 Simple and intuitive UI
  • 💡 Integrated with iOS Files app

Room to Improve

  • 🐛 Buggy and unreliable
  • 🔋 High battery consumption
  • 📥 Slow upload/download speeds
Proton Pass - Password Manager#3

Proton Pass - Password Manager by Proton AG

Secure end-to-end encryption
Worth Considering
📊 Productivity
4.8😐(485 ratings)
FreeIn-App Purchases
Proton Pass - Password Manager screenshot 1
Proton Pass - Password Manager screenshot 2
Proton Pass - Password Manager screenshot 3
Proton Pass - Password Manager screenshot 4
Proton Pass - Password Manager screenshot 5
Proton Pass - Password Manager screenshot 6

Proton Pass is a secure, open-source password manager developed by CERN scientists. It offers end-to-end encryption, unlimited password storage, autofill logins, and 2FA code generation. Safeguard your online identity with this free and privacy-focused app available on all devices.

What We Love

  • 🚀 Decent password manager
  • 🔒 Secure and encrypted
  • 👍 Integrated email alias feature
  • 👍 Competitive pricing

Room to Improve

  • 🐛 Autofill issues
  • 🐛 Logging out issues
  • 🐛 Buggy and unreliable

More Proton Calendar apps to explore

4
Proton Mail - Encrypted Email
Proton Mail - Encrypted Email
Proton Mail - Encrypted Email
Fast, private & secure mail
Free

A secure email platform that prioritizes user privacy and data protection through encryption features. Send and receive private emails with confidence.

📊 Productivity
(44K)
5
Proton VPN: Fast & Secure
Proton VPN: Fast & Secure
Proton VPN: Fast & Secure
Safe and unlimited proxy
Free

Protect your online privacy and security with a powerful VPN that ensures fast and secure internet connections. Safeguard your data and stay anonymous online today.

🔧 Utilities
(3K)
6
Proton Wallet: Secure Bitcoin
Proton Wallet: Secure Bitcoin
Proton Wallet: Secure Bitcoin
A safer way to hold Bitcoin
Free
💰 Finance
(213)
7
Tuta: Secure Private Calendar
Tuta: Secure Private Calendar
Tuta: Secure Private Calendar
Planner, Reminders & Events
Free

Tuta Calendar is a comprehensive scheduling app designed to help you organize your events, tasks, and appointments easily. Stay on top of your busy schedule with reminders, seamless synchronization, and user-friendly interface. Download now to streamline your planning and boost productivity.

📊 Productivity
(139)
8
Notion Calendar
Notion Calendar
Notion Calendar
For your work and life
Free

An advanced calendar app seamlessly integrated with Google Calendar, featuring powerful functionalities like connecting with Notion, multiple time zones, unified view across calendars, widgets, and support for 12 languages. Take control of your time like never before - it's time.

📊 Productivity
(6.6K)
9
Proton Authenticator
Proton Authenticator
Proton Authenticator
Secure 2FA Authenticator
Free

Get the trusted authenticator app that keeps your 2FA codes secure, accessible, and private with end-to-end encryption and strict Swiss privacy laws. Download now and take control of your digital security today.

📊 Productivity
(199)
10
One Calendar
One Calendar
One Calendar
All calendars in ONE place!
Free

Access all your calendars from Google, Outlook, iCloud, and more in one convenient place with easy-to-read overviews and management of appointments and events on all platforms. Simplify your calendar management today!

📊 Productivity
(20K)
11
Teamup Calendar
Teamup Calendar
Teamup Calendar
The Shared Calendar for Groups
Free

Teamup Calendar is a shared calendar application for groups that helps organize people, schedule work, and share events efficiently. It offers multiple sub-calendars, customizable fields, event attachments, and powerful timezone support. Visit https://www.teamup.com to get started and learn more.

💼 Business
(1.5K)
12
NordVPN: VPN Fast & Secure
NordVPN: VPN Fast & Secure
NordVPN: VPN Fast & Secure
Safe & Quick VPN, Best Privacy
Free

Secure your internet connection and protect your online privacy with a powerful VPN service. Access geo-blocked content, browse anonymously, and stay safe on public Wi-Fi networks. Try it now for a safer online experience.

🔧 Utilities
(672K)
13
Blue Mail - Email | Calendar
Blue Mail - Email | Calendar
Blue Mail - Email | Calendar
AI-Powered, Fast & Secure
Free

A powerful email and calendar app powered by AI for quick and efficient organization of your communication and schedule. Stay on top of your emails and appointments effortlessly. Experience advanced features seamlessly integrated for improved productivity.

💼 Business
(10K)
14
Awesome Calendar Lite
Awesome Calendar Lite
Awesome Calendar Lite
Keep Your Busy Life Organized
Free

Keep your busy life organized with this ultimate time management app that offers a fresh user interface, detailed weather forecast, and customizable options. Never miss a meeting or deadline again - download now and stay on top of your schedule effortlessly!

📊 Productivity
(879)
15
Fantastical Calendar
Fantastical Calendar
Fantastical Calendar
Reminders & Todo List
Free

Organize your events seamlessly with an intuitive calendar app that syncs across devices and allows for easy scheduling and reminders. Stay on top of your tasks and events effortlessly.

📊 Productivity
(23K)
16
Naver Calendar
Naver Calendar
Naver Calendar
by NAVER Corp.
Free

Plan your day efficiently with this calendar app featuring various designs, dark mode, 700 free stickers, weather info, and smart briefing. Sync calendars across devices, including mobile, PC, iPad, and Apple Watch. Stay organized with schedules, tasks, habits, and diary entries. Optimize your routine with timely alerts.

📊 Productivity
(104)
17
Week Calendar - Smart Planner
Week Calendar - Smart Planner
Week Calendar - Smart Planner
Sync Agenda Tasks & Reminders
Free

Organize your schedule efficiently with a smart planner that synchronizes tasks and events seamlessly. Stay on top of your agenda effortlessly.

📊 Productivity
(10K)
18
Calendar ·
Calendar ·
Calendar ·
Planner Organizer & Agenda
Free

Plan, organize, and manage your schedule effectively with this all-in-one planner and organizer app. Stay on top of your tasks, events, and appointments effortlessly. Download now to boost your productivity!

📊 Productivity
(59K)
19
Monthly Calendar Moca
Monthly Calendar Moca
Monthly Calendar Moca
by aill, k.k. (JP)
Free

Discover a beautifully designed monthly calendar app with infinite longitudinal scrolling and integration with iOS calendar for easy scheduling. Perfect for those who prefer a monthly view of their schedule. Get organized effortlessly with minimal customization.

📊 Productivity
(90)
20
Google Calendar: Get Organized
Google Calendar: Get Organized
Google Calendar: Get Organized
Easily plan & schedule
Free

Stay organized and manage your schedule seamlessly with our calendar application. Sync, schedule, and book appointments with ease. Download now and take control of your time!

📊 Productivity
(130K)

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