As with all prototyping tools, as long as you have a public share link to test, you can use ProtoPie with Validately testing.
This article will discuss sharing ProtoPie links, as well as provide help for scaling, touch points, etc:
Share links can be created in ProtoPie as shown here:
How to open the “share with display options” menu
Click on the Options menu right next to the Pie’s owner name and select “Share with display options”:
A window will pop up with several display options you can choose and the associated customized shareable link. Below is a list of all available options and what they can do.