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Mobile
SDK by Qonversion.
vs. average for the Education category, $, by region
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For an app that hadn't had any (0) upgrades since its first release years ago - and still worked well and correctly, the required change to 64 bits has brought along with it many improvements in usability. A new much more appropriate/usable keyboard, and lots of learning materials.
This is, currently, the best implementation of J for the iPhone.(And, generally speaking, handy for a variety of tasks.)
J has been a stable App Store product for 5 years and the 701 build is the 3rd released version. It has a special keyboard better suited to J programming requirements and lots of minor improvements. J is a general purpose, high-level programming language.