LettuceMeet helps groups schedule meetings for free without accounts and supports Google Calendar integration.
Free
24 alternativesProton Calendar
Proton Calendar provides a calendar app from Proton, with options for free accounts and business use.
About Proton Calendar
Proton Calendar is a calendar app from Proton, available on Android, iOS, and the web. It provides standard calendar functions while applying end-to-end encryption to events. Event details such as title, description, location, and attendees are encrypted, including events received from other calendar services. Proton is incorporated and headquartered in Switzerland.
With the app, you can add events, modify invitations, and set multiple reminders. It includes automatic scheduling that updates your availability and adds confirmed meetings to your calendar. When used with Proton Mail, you can send event invitations from your mail account and add events directly from your inbox. Free accounts and a business option are offered.
It suits people who want basic scheduling tools with attention to privacy, especially those who already use Proton Mail. It also suits organizations looking for a business calendar option from the same provider.
Key features
- Add events, modify invitations and set multiple reminders
- Send invitations from Proton Mail and add events from inbox
- Automatic scheduling that updates availability and adds confirmed meetings
- End-to-end encryption for event title, description, location and attendees
- Available on Android, iOS and web with business option
Best for: People who want a standard calendar with encrypted events and Proton Mail integration.
Good for
- End-to-end encryption for calendar events
- Integration with Proton Mail for invitations
- Available on Android, iOS and web
- Offers free accounts and a business option
Proton Calendar at a glance
- Website
- proton.me/calendar
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, iOS, Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Proton Calendar FAQ
What is Proton Calendar?
Proton Calendar is a calendar app from Proton for managing events, invitations, and reminders on Android, iOS, and the web.
Does Proton Calendar encrypt events?
Yes. Event title, description, location, and attendees are encrypted with end-to-end encryption.
Does Proton Calendar work with Proton Mail?
Yes. You can send event invitations from a Proton Mail account and add events directly from the inbox.
Is there a business version of Proton Calendar?
Yes. The site offers a free account option and a separate Calendar for Business option.
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