We'd use this as well! For websites, landing pages, emails (ability to upload HTML file), and for Adobe Spark.
I'd like to see the ability to check color separations (like Output Preview in Acrobat) for pre-print production.
I would like to see a true overlay for proof comparison for multiple forms of media. Currently, it can only be done as a "swiping" side by side overlay for images. I'd like to be able to compare a ...