It's one of the reasons my next phone will be Android (with a non-spying custom ROM) instead of an iPhone. Although KDE Connect is already surprisingly powerful on the latter given the limitations of the platform.
The sheer amount of utility Connect has on iOS is insane. It’s starting to compete with handoff and iCloud sharing with how many features they’re recreating.
I prefer graphene personally but not gonna shill. I've dailied both but they are both great. Calyx has a bigger emphasis on free software while graphene has a bigger emphasis on privacy, but you can still achieve most FOSS calyx software on graphene as well.