CircuitMaker can open one of my CS schematics. If you don't want the information made public you would have to use one of the two local project sandboxes it allows. Then use the File > Add Existing Document menu to add in the schematic pages from CS.
To me, the better way to let someone see the schematic would be to make the PDF output of the schematic within CS. If you use the CircuitStudio output job it should make a smart PDF that has the underlying component information available when you mouse click on the symbols. It makes the PDF a bit large. If you instead print the schematic sheets to a PDF driver then the PDF files are smaller and lack the extra information.
This would also allow a reviewer to mark up and add comments to the PDF which they couldn't do with a simple viewer.
I haven't tried to look at a PCB layout from CS in CircuitMaker so I can't comment on that.
