The National Library of Singapore (NLB) uses the Overdrive App for audiobooks and ebooks.
Sign up to get your username and password (if you are not already a member):
https://app.overdrive.com/
(You can select any branch below)
Enter your NLB username and password
You can search for a title here or browse below for both audiobooks and ebooks.
Check on your loans, holds, history here. You can download audiobooks and ebooks here for use offline.
The app also syncs with NLB.overdrive.com when you have logged in, so you can borrow and place holds on the website too.
You can manage account information here and also search collections, subjects, genres, etc.
NLB.overdrive.com