PRODUCTIVITY
SELF-HOSTABLE
STABLE
PAID
PROTON CALENDAR
Protect your life's schedule with Proton Calendar, a secure, encrypted calendar app. Built with React, it automatically updates your availability, safeguards your data, and adds confirmed meetings privately. Join the world's largest encrypted calendar service, respecting your privacy, with a free account and business options.
GITHUB STARS
168
+12% this month
FORKS
19
Active community
LAST PUSH
Apr 25, 2026
Stable
WATCHERS
30
Tracking updates
LICENSE
Unknown
Commercial use
**Proton Calendar** is a calendar app that safeguards user data and schedules.
It is built for individuals who need to keep their schedules private.
Proton Calendar runs with end-to-end encryption.
High Performance
Built for speed and minimal overhead.
Self-hostable
Docker, Kubernetes, or bare metal
Developer Native
Programmable via any language workflow
SUPPORTED LANGUAGES
VISUAL INTERFACE
The Quick Glance
Status
Legacy
Category
Productivity
Pricing
Paid
Self-Hosted
Yes
Available on
Web
Latest Release
v4.1.21
Jul 6, 2021Relative Standing — across 1,284 tools
STARS168
Top 90% globally
FORKS19
Top 89% in Open Source
ACTIVITYLow
Top 94% Activity
WATCHERS30
Top 59% Community