[sxcurry]

Many comments on this thread seem to be confusing cost with value. I have both Libby and an Audible subscription. Libby - free, limited selection, clunky weird interface, long waits for books, production glitches. Audible - nearly every book, available now, good production, return any book anytime, fairly good app, costs $ every month. Up to you which is the best value.

[frosted-flakes]

Libby has a "clunky weird interface"? It's different, but it works really well. I think it's fantastic, and it's certainly better than the old Overdrive app.

As for a limited selection, that depends entirely on how many licences your library buys. My local library has a very good selection. Alas, it also has a lot of users, so some of the more popular books will have long hold lines.