Highbrow does not collect any user data at all. It works only with the images and folders you choose to view on your computer. Highbrow's developer, Xeniacode LLC, has no interest whatsoever in knowing any invasive details about you or the images you view.
Since we do not collect any details about you, we can not share those (non-existent) details with, or sell those (non-existent) details to, any other parties...and we wouldn't do it if we could.
At this time there are no plans to develop any cloud-based or server-based features for Highbrow.
We can see no reason to change this.
-The Highbrow Development Team at Xeniacode LLC