Going beyond iOS and creating a Mac version is the thing that takes this app to the "great" level. Its one of those "Why didnt someone do this before?" things! And, instead of just duplicating the iOS version, they went "above and beyond" and added support for things like the new Toolbar (on the new MacBook Pro laptops).
All of the above tells me that the apps are indeed from good (and most importantly) ACTIVE developers. Oh, and just to say it if you couldnt tell by now, I think the iOS app by itself is great!
And, in this retired developers humble (but also correct ;-) view, if you do happen to hit the "All Versions" button on the review page, please ignore the VERY old reviews. Theyre almost 5 years old, and have almost no relevance to the current app. People are VERY quick to "vent" about any problem, but rarely go back to update their reviews when the problem is fixed! Id like to meet these "perfect" people, who never make mistakes, and are so VERY quick to "throw the first stone"! By leaving these VERY old reviews, people can get a VERY wrong impression of the current app (and also of the developers). Ill just say, especially for this VERY great app, please read the CURRENT reviews. In other words:
"You WILL NOT be disappointed!".
Thank you VERY much to my fellow developers (which is my only "connection"). They really do seem to care about their work and giving us QUALITY products!
Have-Used-App about Mathematics with PocketCAS Pro, v3.8.4