Mobile apps for downloading or playing IF
This page indexes general-purpose interpreter application programs (apps) that are capable of loading multiple works (data files) downloaded or otherwise provided by the player.
Apple iPhone & iPad
Google Android & Amazon Fire
Dived into two categories: multiplexing apps that bundle two or more interpreters into one user interface, or single-interpreter apps.
(Not general-purpose: AndroidIF - generally intended for authors to publish one IF work per app.)