There is an app for macOS called EOS Inspector.
Download it on the Mac App Store and then connect your camera via USB cable to get accurate shutter actuations count measurement.
For detailed information about camera compatibility please refer to the tech specs page.
Long story short: it works with all modern Canon EOS cameras, including the recent models like 1D X Mark II, 5D Mark IV and 5Ds.
EOS Inspector is my product, I am a sole developer behind it. I hope you don't mind that it is offered on the Mac App Store for a price.