It is the customization possible reverse polish notation (RPN) portable calculator.
Method of using differs from the normal portable calculator.
In addition, also it is possible to define the function which in programming language "Lua" is written programmable key.
Also it is possible to build up your own sufficient special portable calculator by the fact that name and macro are changed in the key where the function is allocated already.
Macro setting improved.
Ratings and Reviews
The app starts but exits after about ten seconds. Not very impressive folks. The link to the developer's website shows 'server not found'. Don't load his app, it is likely just a virus.
With Family Sharing set up, up to six family members can use this app.