Good but
Please consider a “batteries included” that contains the standard library. Thanks.
Not perfect but worth getting
I'm glad to see this on the app store, and it's worth getting if you're interested in declarative programming. Especially so if you want to do some logic programming, because the (slightly idiosyncratic) implementation of Prolog included with Shen is the first Prolog we have on iOS. There are a couple of issues, though. One bug: if you leave it and go and look at another app, it's quite prone to crash when you resume. In addition, all you get is a REPL: there's no editor and no way of saving your code (unless I've missed it—there's also no documentation), so it's usable for small experiments but not really for anything larger. Finally, a minor point: I'd prefer a monospaced font.
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