Spotify doesn't allow third-party iOS apps to play its tracks, online or offline, so the only option would be remote-controlling the Spotify app: ads on the free tier, no fade control, no ceremony timeline, and no protection if Spotify crashes mid-processional. Apple Music can play your songs, but it has no ceremony timeline, no per-track trims and fade-outs, and no protection against a wrong tap mid-ceremony. Wedding Player builds on top of Apple Music and adds all of that, with your own files imported straight into each moment. You can also pick from
Wedding Player Originals or import any local audio file (MP3, M4A, WAV).
Read the full explanation. For the side-by-side, see the full
Wedding Player vs a playlist comparison.