I agree about the excellent-ness of Pythonista for writing Python on the iPad. Raskell is also excellent for writing short Haskell programs on an iPad. Hacking bits of Haskell on my iPad is a favorite activity when I am flying and don’t have an internet connection.
What I really hope for is a version of Pharo Smalltalk that was beautifully integrated and sandboxed on the iPad. I would pay a lot of money for it!!
Squeak was ported to the iPhone in 2008, but has never been allowed in the app store. So you have to be a developer and download it and compile it yourself just for your own device, which is kind of the point of the article.
Note that applications built on top of Squeak and Pharo have been allowed on the app store, but all the programming goodness has to be completely hidden. The only exception I know is Scratch, which keeps Smalltalk hidden but is itself a programming language: https://www.softumeya.com/pyonkee/en/
What I really hope for is a version of Pharo Smalltalk that was beautifully integrated and sandboxed on the iPad. I would pay a lot of money for it!!