third-party shelf apps can remarkably still offer a systemwide solution that works just as well as an iPad power user might hope. The revamped Slide Over feature in iOS 11 is perfect for a shelf app.

Last month after iOS 11’s launch I pulled together a roundup of iPad apps belonging to a whole new category of apps. Dropped, Workshelf, The Shelf, and Scrawl Pouch all launched as manifestations of ...