I just posted this to DesignerNews but thought maybe posting it here too would be a good idea:

I recently suggested implementing CMYK-profile support into gravit.io to make it possible to create print-ready documents with it. They like the idea but I have no idea how embedding/attaching color-profiles to PDFs actually works.

Here's the thread on their forum: https://discuss.designer.io/t/please-implement-cmyk-color-print-profiles-to-gravit/ if anyone is able to help (comments here on HN are also very welcome of course ^__^). Thanks!

EDIT: Mh, is there a way to make these links work? („help“ says no?)