Time to update this list, since it's been six months and I also use an iPad now.

V-Control Pro replaced AC Core Mini (iPad only).

Splashtop Streamer, while not a music app, allows remote control of my computer. The combination of V-Control Pro and Splashtop Streamer means I can control my production PC from the studio, replacing the old Frontier Design Tranzport with a far more powerful solution.

I still don't like any of the mini-DAW apps, but Multri-Track seems to be the best of those available.

BackTrax has some promise as a performance jukebox.

And while it's not a solution most of you will be able to use, as a programmer, I wrote my own "non-app store" app in HTML5 and CSS with links to various music sites I find helpful.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.