Clair Judas, SPED Technology Specialist, compiled a list of switch accessible apps for the iOS devices. While not meant to be all inclusive - this is a great starting point for apps that allow for alternative access.
Here are just a few apps with switch access…
> Sounding Board
> Predictable
> Scene & Heard
> TapSpeak Choice
> TapSpeak Sequence
> Go Talk Now
> Alexicomm AAC