What’s New

Version 3.0.2

- Adjusts layout for selected iPhone models.
- Avoids rounding errors when restoring data.
- Corrects the website and email links in the (i)nfo menu.

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

trekkari ,

The best HP emulator!

Having tried three different HP-48 emulators and found all of them capable but lacking in various aspects, I am happy to say that this HP-28 emulator is sheer pleasure! The functionality is all there, the color and look of the original HP-28S is faithfully reproduced, the left hand side keyboard is very neatly implemented, easily slide between the trig/exp functions mode and alphanumeric, and I can program the various constants into alphanumeric combinations (e.g., ME for the electron mass, or h for Planck's constant). The stack is easily visible as a running tape, and most useful feature: You can scroll the stack and touch any stack entry to pick it out and put it on top of the stack. But most importantly, this emulator is a joy to use! I find myself coming back to it again and again to admire all the user-friendly features and just play with it. A fun calculator, and will probably only get better.

Blue Pine ,

FANTASTIC - this is the only way...

I can't really run a "normal" calculator because I've always used RPN, and it makes sense. Nothing else makes sense. So even when I got my iPad, I still pulled out my RPN calculator to add 2+2. Then I found this app! So happy, so perfect! I can hardly believe it - this is everything I want or need. PERFECTION!

I'm so grateful I found this one because RPN is the only way to go, and this one works without the problems and weirdness of the other RPN app I tried. That other one was several times the price, and turned out to be a somewhat bizarre and terribly problematic nightmare, in my opinion. I deleted it very quickly.

This one works. And, it is well designed, it has GREAT documentation, and I absolutely love it. This app is turning my physical RPN calculator into a museum piece lol.

This is a great app, and they've made me a happy camper :)

Ejbragg ,

Powerful & Easy to Use

If you're comfortable with rpn (reverse polish notation), this is an excellent app. It may be overkill for the average joe, but this is reminiscent of my 48GX calculator, used back in engineering school, without the graphics/plotting interface.

If you're not accustomed to rpn calculators, but are in a technical field, now is the time to consider learning. There's no huge learning curve here; just a different way of entering your numbers. It seems awkward at first, but for large formula hacking, rpn is the way to go, making short work of the most complicated calculations!

This one is more expandable than at first meets the eye, offering all the basic necessities for solid number crunching.


Eric Roller
9.7 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2013-19 tredje design - Eric Roller


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like