Timetree calendar

==TimeTree==

https://timetreeapp.com/signin
 - free
- ==android app== + web client
- known for being the best collaborative calender (sharing and syncing)
- multiple calendars , bijvb. : prive / work / tango , etc
- works on de-googled phone :
- it works on e/os
- LineageOS ? not tested yet

syncing / importing :
https://support.timetreeapp.com/hc/en-us/articles/360000629341-Using-other-OS-calendars-in-TimeTree

TimeTree works with :
- The default Android calendar (OS Calendar)
- The default Apple calendar (OS Calendar)
- Google and Outlook calendars

But not Lightning => 2 step ? : sync Lightning <> android calendar <> Timetree

Lightning has an add-on for google calendars
both Google Calendar and Lightning support a protocol named caldav, making the addon unnecessary.
the caldav approach: https://wiki.mozilla.org/Calendar:Using_Lightning_with_Google_Calendars

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