Compatible Apps
Cirrux follows open standards. This means that a broad range of apps can be used to access your Cirrux mailbox, calendar, contacts and reminders.
macOS
Cirrux works really well with the default apps on macOS: Mail, Calendar, Contacts and Reminders.
Thunderbird is also a great option.
iOS
Just like on macOS, you can use the default apps on your iOS device: Mail, Calendar, Contacts and Reminders.
Windows
Thunderbird works great for email.
Linux
Thunderbird works great.
Android
You can use DAVx⁵ to sync your calendar, contacts and reminders. DAVx⁵ is a sync adapter that makes your data available to other apps on your device.
Google Calendar has preliminary support for CalDAV, but doesn't seem to support reminders.