Great question, @Matthias_Kallweit.
Thanks for the sparkle
I was a an addicted Notion user for the last year, amazed with itās flexibility and aching to build the perfect GTD system (for me). Calendar sync were the worse bottleneck for me.
Coda has not just that (which Iām honestly still trying to figure out how it can relate to my GTD table with not just due dates), but I wrote something about it here: