I do not want to take away mfikes' thunder (super solid and amazing work by the way, sir. Saw your blog post on earlier work on /r/clojure on reddit ... I think, maybe a week or two ago), but how viable is something similar on Android?
I would LOVE to have something like on my Nexus 6 while in the park and outings with the family.
In short, to make an Android version would involve just running a JavaScript engine and hooking up a little bit of UI to send strings to it, and get strings back out of it.
Replete is open source... feel free to steal heavily from it.
Look at how simple and rough the first working version of Replete was (see demo of it at bottom of http://blog.fikesfarm.com/posts/2015-06-27-replete-a-standal...)
IMHO an Android version is just waiting to be created by someone. :)
Maybe I will steal a friend's iPad to play with your stuff. Will keep track of your stuff.
Also, it is a slightly older version, but if you want, you can try it directly online here: https://appetize.io/app/8hf37bv29k2zrj0v2j765xt3jr