Great simulator of a great calculator and a great app
This is truly one of the best. Faithful reproduction of the HP-28S, the first user RPL calculator, that keeps all the good stuff and improves on the not-so-good (the display, for example, is so much better than that on the actual calculator). Stable and well thought out, with a very polished look. The plotting capabilities are pretty amazing. Very responsive developer; helped me immediately with a workaround to a minor problem and released an update within a few days. Allows me to do anything I used to do with my old 28S, and without the creaking plastic clamshell case sound! Highly recommended and worth every penny of the price. Hope to see more from this developer.
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Works well with M1 Macs
Using this now in Monterey and it works like a charme. Even the Mac's keyboard is fully supported.
Best Calculator out there
Love how responsive Halcyon Software is to fixing and improving this software. My favorite change on this release is the long or 3D press to get the red shift key.
My 28S still runs perfectly but the battery door is so fragile. I can use Halcyon Calc all the time.
My 28S still runs perfectly but the battery door is so fragile. I can use Halcyon Calc all the time.
Marvellous
I have bought about 6 calculators for ios, looking for a good HP RPN equivalent.
This is the best - its not just an emulator, but has been written from scratch to keep the great original features but improve them too, e.g. graph plotting at native resolution.
This is the best - its not just an emulator, but has been written from scratch to keep the great original features but improve them too, e.g. graph plotting at native resolution.
It works better than I had hoped!
My HP 28S calculator (the best programmable scientific calculator ever built) is back! Thanks so much! I took a rather complicated engineering program from my 28 (which used some rather esoteric functions), laid it in, and it ran perfectly! Two thumbs WAY up! More if I had them.
Response from developer
Thanks so much for the review and so glad to hear that your programs from back in the day just worked in the app. I strive to reproduce the behaviour of the 28S but sometimes fall short. If you do find something in the future which seems wrong, let me know and I will try to fix it for you. Thanks again for the feedback.
My favorite RPN calculator
I went to college in the late 80's with an HP-28S. I still have the HP calculator, and it still works; and I'd been wanting an RPN calc for the phone that was similar to that one. There are a bunch of HP-12-like apps, but this is the first one I've found that behaves similar to the 28S. Very happy with Halcyon Calc; I've been able to delete all the other RPN calculator apps that I've tried.
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