Well, it can be short for "instant book mockup" or "Instagram book mockup", depending on the context. :)
Anyway, this web tool is dedicated to the #bookstagram community, where writers share their newly launched books and readers review books by aspiring authors.
Most book covers are designed to be read small, on a retailer page — flat, cropped, alone. Instagram wants something else: a square photo that looks like a real person has the book in their hands, on their shelf, next to their coffee. Not every author has the time, the props, or the daylight for that photoshoot.
This tool skips the photoshoot. Drop in a cover image, and it places it into a small set of bookstagram scenes — a flat lay, a sunlit hand-hold, a shelf, a cozy reading nook, a stack, a clean window-light frame — cropped to Instagram's 1:1 square. Choose the themes you want, generate them, and download the ones you like.
It's built for authors with a launch coming up, bloggers covering an advance copy, small presses without a photo budget, and anyone who'd rather spend the afternoon writing than arranging candles.