Alternatives to Proton Calendar
E2E encrypted calendar
Proton Calendar ranks #8 of 8 in Calendar apps, with an Alt Score of 42. It is licensed under GPL-3.0, freemium from €3.99/mo and available on iOS, Android and Web. 7 of 10 checklist rows are verified against a public source.
Individuals and businesses who want to keep their schedules and event details private, from personal users to teams needing GDPR/HIPAA-compliant collaboration.
A fully encrypted calendar where event titles, descriptions, locations, and invitees are protected end-to-end (with zero-knowledge encryption for events from non-Proton calendars). It integrates directly with Proton Mail for invitations and event creation, supports shared/team calendars, and is available on web, iOS, Android, macOS, Windows, and Linux.
Users create and manage events through the Proton Calendar app or directly within Proton Mail; invitations, RSVPs, and updates sync automatically while all event data stays encrypted, hosted under Swiss privacy law.
Where Proton Calendar stands out
Verified capabilities most alternatives don't have.
Why people leave Proton Calendar
Dashed reasons are sourced facts; the rest are opinions. Vendors can dispute.
Sign in to add a reason — new reasons go through moderation before appearing.
Ranked alternatives
Ordered by Alt Score. Click any score to see the breakdown.
Feature comparison
How Proton Calendar compares with its alternatives, feature by feature.
| Calendar apps checklist | Proton Calendar | Google Calendar | BusyCal | Fantastical | Amie | Morgen |
|---|---|---|---|---|---|---|
| Pricing model | ||||||
| Starts at | ||||||
| License | ||||||
| Platforms | ||||||
| Accounts supported (Google, CalDAV, Exchange) | ||||||
| Natural language event entry | ||||||
| Scheduling links built in | ||||||
| Tasks integration | ||||||
| Menu bar / widgets | ||||||
| Time zones handling | ||||||
| Offline | ||||||
| Open source | ||||||
| One-time purchase option | ||||||
| Team scheduling |
Every fact and feature listed for Proton Calendar is verified against its own pages. Each alternative is sourced on its own page.
-
Starts at €3.99/mo verified 2026-07-10
€47.88 for one year (€3.99/month)
https://proton.me/support/proton-plans -
License GPL-3.0 verified 2026-07-10
spdx_id": "GPL-3.0"" — Proton's web clients (incl. Calendar) are published under GPL-3.0.
https://api.github.com/repos/ProtonMail/WebClients -
Platforms iOS, Android, Web verified 2026-07-10
Dedicated Calendar apps are iOS/Android plus the web app at calendar.proton.me; desktop access is via the bundled Proton desktop app.
Download Proton Calendar for Android & iOS
https://proton.me/calendar/download -
Pricing model Freemium verified 2026-07-10
Free tier includes personal calendars; paid Proton plans add more.
3 personal calendars
https://proton.me/support/proton-plans -
Status active verified 2026-07-10
pushed_at": "2026-07-10T08:16:35Z"" — WebClients repo pushed the day of research.
https://api.github.com/repos/ProtonMail/WebClients -
Accounts supported (Google, CalDAV, Exchange) Partial verified 2026-07-10
Only Google import (Easy Switch) and ICS import/subscription; no CalDAV, no Exchange.
Proton Calendar doesn't support CalDAV, so you can't set up a direct two-way sync with an external calendar.
https://proton.me/support/subscribe-to-external-calendar -
Tasks integration No verified 2026-07-10
Tasks are listed as a much-requested feature still in development, i.e. not yet available.
a faster and more stable next-generation calendar app for both iOS and Android to support much-requested features like tasks, search capabilities, and offline access
https://proton.me/blog/mail-calendar-roadmap-spring-summer-2025 -
Time zones handling Yes verified 2026-07-10
To change the time zone the event occurs in, click Show time zones and change the settings as required.
https://proton.me/support/protoncalendar-create-modify-events -
Offline No verified 2026-07-10
Offline access is listed as a much-requested feature still in development.
a faster and more stable next-generation calendar app for both iOS and Android to support much-requested features like tasks, search capabilities, and offline access
https://proton.me/blog/mail-calendar-roadmap-spring-summer-2025 -
Open source Yes verified 2026-07-10
spdx_id": "GPL-3.0"" — Proton's clients are published under GPL-3.0 in the ProtonMail/WebClients repository.
https://api.github.com/repos/ProtonMail/WebClients -
One-time purchase option No verified 2026-07-10
Recurring subscription plans only; no perpetual licence.
€47.88 for one year (€3.99/month)
https://proton.me/support/proton-plans -
Team scheduling Yes verified 2026-07-10
Check everyone's schedule at a glance
https://proton.me/calendar/features
FAQ
Yes. Google Calendar, Fantastical and Amie have a free tier or are fully free. Free-tier limits in the comparison table are verified and dated.