I'm deliberately not mentioning the service or libraries I use here.
I use multiple libraries. Searching them one by one isn't fun. Now, a CLI I can use to search them at the same time. Didn't make a website because I assume I would have to deal with CORS.
npm install --global https://github.com/hughrawlinson/library-search
Use a comma separated environmental variable to specify which libraries to search. Use the first argument to specify the query.
LIBRARIES="fls,afls" library-search "a fictional book"
If you would like to search for ebooks instead of audiobooks specify "book" before the query:
LIBRARIES="fls,afls" library-search "book" "a fictional book"