I really enjoy the feature that allows me to use the public Test URL for my project to let coworkers preview the work and give me feedback.
I created a second project, which is a copy of my first, to avoid making changes while people were trying to look at the preview. When I had additional changes ready I gave them the new URL (making sure it was marked Public), but they are redirected to an Appery.io login page.
It is incredibly helpful to be able to have a public preview URL for my projects without any signup/sharing hassles -- why is it that my first project can be previewed by anyone, but my second acts like it is private? Is this a feature or a bug?