Things[1] has had this feature as long as I can remember. Just mentioning it since Sorted seems to be Mac/iOS only too and the title mentions this as its main feature.
I noticed that Things clearly warns you when you import Reminders... that they will delete those imports from Reminders. Sorted doesn't appear to do the same. A big, bad oops IMO.
[1] https://culturedcode.com/things/