Great question! We made you a Venn diagram so you can compare in style.
If you'd like the TL;DR version, Book Insights is a service providing an archive of expert-written commentaries on bestselling nonfiction books. There is a newsletter that brings Insights to your inbox daily. You can learn more about the newsletter here.
Audiobooks is a service providing great prices on audiobooks in addition to a catalog of titles you can listen to as much as you want. You can access the audiobooks on our app, whereas you can only listen to or read Insights on our website.
If you'd like to try out an Audiobooks membership, check out all of the details here.