Libby (iOS)
Used by 4 peopleapps.apple.com ↗

“Libby: You can plug your library card into it and check out digital ebooks and audiobooks.”
Claude Zeins Interview, Video director · via Uses This 
“Said iPhone is also my go-to for listening to books on tape (thank you, local library Libby app) and for meetings, keeping my calendar, checking email, and conducting all kinds of impromptu interviews.”
Dr. Psyche Interview, Culinary historian, writer · via Uses This