I didn’t see the Artiphon anywhere here so I thought I’d mention it. I had one for a little while but the ribbed string surface simulation bothered me. Otherwise it was fun and portable.
I forgot I did a quick little video of me playing some iOS soft synths.
From their web site:
"The INSTRUMENT 1 is an intuitive musical toolkit that adapts to the way you want to play. It’s the first MIDI multi-instrument that lets you strum, slide, tap, and drum any sound on a single interface.
Hold the INSTRUMENT 1 in multiple positions and play using a range of intuitive musical techniques. Revolutionary digital strings let you easily customize tunings, switch between fretted & fretless modes, and even control effects and string bends with pressure sensitivity."