From Gambit wiki
Gambit REPL is an app based on the Gambit Scheme system which is available for mobile devices such as the iPhone and iPad. It provides a REPL to interact with the interpreter, a script editor, and builtin documentation.
The documentation for Gambit REPL is available in the Help view of the app. This page of the Gambit wiki is for user contributed comments and documentation which are of general interest to the Gambit REPL users. Please contribute by editing this page and creating other pages!