Just missed a meeting today because I accepted an event on Thunderbird this morning, that should have synced to Nextcloud, and then to my phone running a calendar app from 'simplemobiletools'. Never made it. After I missed the meeting I didn't see the event on nextcloud, then went to look at the event on thunderbird, and now lo and behold its on nextcloud, two hours after it was over. Cool. Still not on the phone.

Anyone have a solid calendar stack they like? I'd like to reliably get from emailed invite to alert on my phone.