Droid48

Arnaud Brochard

About this app

Emulator of the HP 48 scientific calculator, using RPN. Port of the X48 project (sources available on github). HP48's "grayscale mode" cannot be emulated.

Visit www.hpcalc.org for a large program collection.

Cool tip: tap the HP's LCD to show/hide a simpler numeric pad !

Ratings and reviews

My parents worked at HP so I grew up with RPN in high school (mid-80s), owning several calculators (LED & LCD). This works great and true but I find it's easier to use on a large screen. I wish the division symbol was a forward slash because the one used looks too similar to the plus sign when I'm not wearing my glasses. Lately the display sometimes twitches and all values are lost. Same when the orientation changes, values are lost and sometimes it just locks-up. Android v.16.

Keys are much more responsive than Emu48, but this emulator fails to save the state of the machine. A Google search indicates this may have been intentional, requiring the paid version in order to save the state of the emulator. Fair enough, but I see no play store option for a paid version... super annoying to not be able to save my custom unit conversions. All I really hold to be the single feature of my HP48GX is its unit conversion stuff, all else I do on a PC now....

It's wonderful. I've found nothing to dislike. It's just like my old HP48 calculator from back in the day. I cut my teeth as an engineer using RPN (Reverse Polish Notation) and it's hard to go back. RPN sadly has gone out of fashion. It's faster, especially if a formula has lots of parentheses. One issue: I can't seem to keep my number format mode set to Engineering. Always back to Standard when I reopen the app. Help with that would be appreciated.