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If you have an iphone, try out this awesome, free RPN calculator. Link: https://apps.apple.com/ae/app/rpn-30/id1451413517 https://apps.apple.com/ae/app/rpn-30

If you have an iphone, try out this awesome, free RPN calculator. Link: https://apps.apple.com/ae/app/rpn-30/id1451413517 https://apps.apple.com/ae/app/rpn-30/id1451413517 Reviews: https://appgrooves.com/ios/1451413517/rpn-30/ashok-khanna/positive https://appgrooves.com/ios/1451413517/rpn-30/ashok-khanna/po... Note: I am the Author, but this is not spammy, I already have 10,000 users and don’t charge for it anyway :)

ChrisMarshallNY 6y ago
It is nice. I will say that PCalc has been around for a long time, and does RPN (along with a lot of other stuff). PCalc has been a fundamental tool for me for ages. That said, I’ve never become comfortable with RPN.
- abhinav22 6y ago
  That’s great to hear. It is interesting on RPN, I got used to it and normal entry feels foreign to me now. I guess you need to use it for a while to get used to it. Thing is I only do basic calculations with RPN, I can see how it may be jarring for scientific calculations or longer multi form ones (although there are many who are very comfortable and prefer this mode of entry).
  - ghaff 6y ago
    You need to get used to how you chain calculations but if you do it on a regular basis it becomes second nature. I imagine the additional display lines of the HP-42 make it easier than the one line displays of most of these calculators.
jonsen 6y ago
> If you have an iphone, ... and iOS 13+ :-/
- abhinav22 6y ago
  Yeah I know :-/ I refactored it to Swift UI but Apple didn’t provide backwards comparability for old iOS, which I didn’t know until it’s too late. There’s nothing that special in Swift UI that forces it to be 13+, but that’s life
  - jonsen 6y ago
    Looks really interesting, so I’ll try to remember it until I get a new iPhone.
FullyFunctional 6y ago
My favorite calculator app is Free42 (https://apps.apple.com/us/app/free42/id337692629 https://apps.apple.com/us/app/free42/id337692629) which is a (AFAICT) faithful HP-42S reimplementation. Besides the obvious functionality, I really love the haptic feedback (configurable) and the graphics. Recommended (it's also free).
- ghaff 6y ago
  It's nice and would probably be my goto except that I used an HP41 for so many years that's just what I'm used to. (And TBH I don't need either to add up or multiply numbers from time to time :-) ) The Swiss Micro calculators are tempting but I know I'd just be indulging in nostalgia. I have zero need for anything beyond my iPhone app and a couple of HP-1x series landscape format models.

ChrisMarshallNY 6y ago

It is nice. I will say that PCalc has been around for a long time, and does RPN (along with a lot of other stuff). PCalc has been a fundamental tool for me for ages. That said, I’ve never become comfortable with RPN.

abhinav22 6y ago
That’s great to hear. It is interesting on RPN, I got used to it and normal entry feels foreign to me now. I guess you need to use it for a while to get used to it. Thing is I only do basic calculations with RPN, I can see how it may be jarring for scientific calculations or longer multi form ones (although there are many who are very comfortable and prefer this mode of entry).
- ghaff 6y ago
  You need to get used to how you chain calculations but if you do it on a regular basis it becomes second nature. I imagine the additional display lines of the HP-42 make it easier than the one line displays of most of these calculators.

jonsen 6y ago

> If you have an iphone, ... and iOS 13+ :-/

abhinav22 6y ago
Yeah I know :-/ I refactored it to Swift UI but Apple didn’t provide backwards comparability for old iOS, which I didn’t know until it’s too late. There’s nothing that special in Swift UI that forces it to be 13+, but that’s life
- jonsen 6y ago
  Looks really interesting, so I’ll try to remember it until I get a new iPhone.

FullyFunctional 6y ago

My favorite calculator app is Free42 (https://apps.apple.com/us/app/free42/id337692629 https://apps.apple.com/us/app/free42/id337692629) which is a (AFAICT) faithful HP-42S reimplementation. Besides the obvious functionality, I really love the haptic feedback (configurable) and the graphics. Recommended (it's also free).

ghaff 6y ago
It's nice and would probably be my goto except that I used an HP41 for so many years that's just what I'm used to. (And TBH I don't need either to add up or multiply numbers from time to time :-) ) The Swiss Micro calculators are tempting but I know I'd just be indulging in nostalgia. I have zero need for anything beyond my iPhone app and a couple of HP-1x series landscape format models.