This hasnt been updated in over 2 years, and thats a real shame. I scrobble daily, and all the other apps are not very good at precise scrobbling. The UI needs to be updated, the scrobbling compatibility with the default music app, as well as getting on the last.fm page all need to be updated. Very sad that last.fm is dying, as it seems.
Xaqua777 about Scrobbler for iOS