HP Prime or HP 50g

[Tim Wessman]

And as an interesting side note... people have compiled and are running numworks on the Prime hardware by replacing the ROM. That is the first time a "competitor" has been capable of running the firmware from the other company. If that doesn't say something about the relative capabilities I'm not sure what else would.

Numworks is simple, but that is primarily because it has *nothing* but early level capability. Bluntly, it will not grow with the user through higher level math and into university.

You can try out numworks through the web interface they have, and you can download HP Prime's free app on android/ios/winstore or use the full version for free on Win/Mac.