![](https://play-lh.googleusercontent.com/EGemoI2NTXmTsBVtJqk8jxF9rh8ApRWfsIMQSt2uE4OcpQqbFu7f7NbTK05lx80nuSijCz7sc3a277R67g=s32)
A Google user
Incredible RPN calculator! If you like HP calculators, this is flat out amazing! It has the same layout as the original HP-42s. It even runs the same programs -- but much faster than the original! There's a "haptic feedback" option which feels something like the actual HP key clicks. There are other layouts if you like a horizontal layout. The settings screen is accessible if you touch the calculator display.
11 people found this review helpful
![](https://play-lh.googleusercontent.com/EGemoI2NTXmTsBVtJqk8jxF9rh8ApRWfsIMQSt2uE4OcpQqbFu7f7NbTK05lx80nuSijCz7sc3a277R67g=s32)
A Google user
Absolutely wonderful work. I prefer one of my real HP calculators, but sometimes all I have with me is my phone. I've used several RPN calculator apps, and this is one of my two favorites. For a phone app, giant graphing calculators are unwieldy. On a phone screen, the keypad of the 42S is very manageable. A joy to use.
12 people found this review helpful
![](https://play-lh.googleusercontent.com/a/ACg8ocKOHw5-jT2dlqNm1sU5nNv4Ous3KRhkfIfHMI9oDnslBzdaBA=s32-mo)
Robert Rohwer
I still have two HP42s, one for my office at work, one for my office at home, both in a drawer. Free42 now resides on my phone and computers. It is a perfect emulation with some significant advantages in stack height and memory. I occasionally miss the HP's programmability, but usually just turn to a spread sheet for highly repetitive calculations or more specialized apps or programs for more challenging work.
14 people found this review helpful
Thomas Okken
February 24, 2021
Free42 is programmable too!