Frankly, I didn't bother looking for any similar apps before writing Muziko, so I can't tell you for sure how it is or is not like Anki, but Muziko works on the same spaced-repetition principle that Anki would.

Strictly speaking, there are no music-specific features other than branding and UI labels; however, I hope to add some more music-specific features like a metronome and tuner in the near future.*

*I have used GuitarTuna in the past for a metronome, but I'm fed up with how slow it is and all the popups trying to get you to subscribe to Yousician, so I'd love to add a metronome to Muziko so I can delete GuitarTuna for once and for all :D (and yes, I could just get another metronome app, but I haven't. I'm lazy like that.)