Songstack - Swipe to discover new music for Spotify
SoundCloud Go - Your favorite music and new discoveries, offline and ad-free
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
Mixmatic - Genre based music discovery made easy
22tracks - DJ curated Spotify playlists on iOS
ReWrapped - Sound-driven music discovery