"Tidal" just now passed "Spotify" on Apple's App Store (it's first time since release), as it's now at #11. It's risen 190 spots today, and it's likely to rise even more.
The app store takes a lot longer to update chart wise than the music chart too, it's probably even higher than #11 right now. The only other music related app above it is Pandora at #10, which it's about to pass