as far as I understand, sketchup for ipad still works as a viewer, so long as the person using it doesn’t have a subscription.
if they subscribe to GO it becomes the powerful design tool.
Pretty sure nobody will develop a SU viewer app in white label, because a SU viewer app technically already exists.
What remains is standard 3d apps, I don’t know any, don’t have an ipad, but I know there are some on mac and PC that can technically open SKP, or derivative formats (colada & other). But these apps don’t have the tag thing.
as far as I know, both on desktop, web and ipad, the only software that can do all you ask is Sketchup.
edit : you asked a couple month ago about Sketchup viewer on ipad and got the same answer.