Not worth of it
Don’t waste your money!
Best calculator app!
I *LOVE* Free42
Plus42 is even better!
Plus42 is even better!
Perfection
Once you use an RPN calculator, you will never go back. The HP-42S beats the HP Prime in layout and ease of use for most task, and the enhancements in this implementation is great. I love having the (enhanced) HP-42S always with me on my iPhone whenever I need a calculator.
Can’t convert from DMS to decimal degrees!
WTF. It can easily convert decimal degrees to DMS, but not DMS to decimal degrees?!? What is the point of having one but not the other?!?
Response from developer
The function to convert degrees/hours, minutes, and seconds to decimal degrees/hours is called →HR. It's in the CONVERT menu, right next to →HMS. Note that I would have noticed your comment much more quickly if you had emailed me. This space is for app reviews, not for tech support.
Great calculator, however
I’ve really like this calculator however lately there seems to be an issue with programming. I had a program for the sulfur to convert Celsius to Fahrenheit and vice versa but for some reason it doesn’t work anymore so 212 Fahrenheit should be 100 Celsius. it comes up with something like minus one point something to the power of 6000 I wonder what the issue is?
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Response from developer
Please contact me via email for support.
The Perfect Calculator
The 42s was, in my opinion, the most elegant calculator ever devised during the golden age of HP engineering.
This simulator perfectly recreates this legendary calculator and it adds some additional great features. It has several enhancements seen in the RPL calculators without introducing the shortcomings of the more complex interface. Put another way, this calculator is what HP should have done with the 48 line.
I believe that Plus42 now deserves the crown of the best calculator. It is the perfect continuation of the RPN days, and since it lives on your phone, it is always at hand. All that for just under $10!
This simulator perfectly recreates this legendary calculator and it adds some additional great features. It has several enhancements seen in the RPL calculators without introducing the shortcomings of the more complex interface. Put another way, this calculator is what HP should have done with the 48 line.
I believe that Plus42 now deserves the crown of the best calculator. It is the perfect continuation of the RPN days, and since it lives on your phone, it is always at hand. All that for just under $10!
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Wow
Can’t believe how happy this app makes me, to once again have my favorite calculator in hand. The HP-42S was unmatched and this app replicates it perfectly. Simply amazing. Thank you!
Super Implementierung
Ich nutze den Rechner jetzt schon seit längerem (in der Plus-Version). Bin sehr begeistert, echt super!!! Auch das Programmieren funktioniert „wie gewohnt“ (wie früher), echt cool, danke!
What a delight!
I can’t believe I missed Thomas Okken’s free42 and plus42 projects until now, over 20 years after his first release it appears. It’s been a joy to get reacquainted with RPN and now have the same calculator on my phone, which I have on me all the time, as I have at my desk in physical form via SwissMicros’ DM42n that just arrived. Having a physical calculator at my fingertips that I love to use is something I haven’t experienced in probably 30 years, since college. The astro navigation and conversion apps I pulled down and loaded from Thomas’ website this morning is what prompted me to write this review. Thank you Thomas for this gift to us all! You’ve left no detail out for someone like me.
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Best calculator I've seen
I tried several calculators apps and in my opinion this one is the best by far. It has much more than I need and yet it is easy to use and intuitive. This is the one I use most.
希望在矩阵计算的功能更多一些
类似50g，在矩阵的创建、运算、分解支持更多功能
。
比如可以直接提取某一行列为对角矩阵，
50g的矩阵计算功能十分丰富，如果像plus42这样支持大屏幕，会极其美好
。
比如可以直接提取某一行列为对角矩阵，
50g的矩阵计算功能十分丰富，如果像plus42这样支持大屏幕，会极其美好
Best RPN calculator out there
Great implementation of the HP42. Would love it if the developer could add a dark mode icon.
Love This
In college I was an HP41C user. Once in my first engineering job I switched to the HP42S which has served me well over my 30+ year career. Once iPhones became a thing, I loaded Thomas’s Free42 and have been using that for a couple decades. I still have a real 42S on my desk for daily use. I recently purchased an HP Prime which is a lovely calculator but it’s just not completely comfortable to use. Switching to Thomas’s Plus42 feels really comfortable and adds lots of lovely features. I will likely purchase a SwissMicro DM42 to be used as my daily desk calc so that my phone app and physical desk calc are similar. That would send the 42S to the vintage calc cabinet. Honestly having this on my phone is massively so functional it’s hard to justify even owning a physical calc but there are times at the desk when it’s nice to grab the physical unit with tactile keys that can’t be interrupted with alerts :-). This is a beautiful upgrade to the free42. Thanks Thomas!
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why does this calculator can only store 4 numbers?
Hope can store more numbers
Response from developer
You can store as many numbers as you like using STO. Or, if you want more than 4 stack levels, you can use the dynamic stack, by switching to NSTK mode: MODES ▲ NSTK. (You can return to the 4-level stack mode with MODES ▲ 4STK.)
The best by far
This calculator is the main I use. It's a great scientific HP-like calculator inspired on the 42 model. Its fast, efficient and above all maintained and improved.
When I need to do anything, I use this one first.
I love its precision.
I deleted the Apple one because this one is better by far. You can't go wrong with this one.
When I need to do anything, I use this one first.
I love its precision.
I deleted the Apple one because this one is better by far. You can't go wrong with this one.
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非常好的模拟器，如果能支持iOS 9就更好了
App功能非常强大，如果能支持低版本的iOS就更好了，比如iOS 9.3 ，这样就可以在一些老的iPad，或者iPhone上安装它。
希望开发者能认真考虑一下这个建议。
希望开发者能认真考虑一下这个建议。
Response from developer
Unfortunately, Apple's current software development tools only support iOS 12 or later.
全てに驚愕!plus
DM42とあせて使っています。
ボタンの光沢輝きをfree42なみにしていただけたら、私には、もう完璧だと思います。
πの1万桁を約1. 5分で計算してくれます。
このアプリには虜になってしまいました。
日本語取説が欲しいですが、それは贅沢な要望かも知れませんね！
開発者さん、有難う❕
ボタンの光沢輝きをfree42なみにしていただけたら、私には、もう完璧だと思います。
πの1万桁を約1. 5分で計算してくれます。
このアプリには虜になってしまいました。
日本語取説が欲しいですが、それは贅沢な要望かも知れませんね！
開発者さん、有難う❕
Need multitasking
When using on iPad, the app occupies the whole screen. Currently it does not support multitasking. But it would great to share the screen with other apps (side or floating window).
Response from developer
I added iPad support in 1.1.4a.
Excellent calculator !
As old user of a HP42 and actual user of a Swissmicros DM42, iI use Plus42t every day and appreciate it very much !
It is the best calculator i ever had
It is the best calculator i ever had
Beautiful and functional at the same time
Thomas has done an outstanding job on this app! It is not only the most beautiful calculator app out there, but it’s also the most powerful and functional of any of the HP inspired calculator app. The graphics are outstanding and the “extras” that were added in addition to the 42s standard makes the app even more appealing.
If you know how to use a RPN calculator, this IS the one to have and use. If you don’t know how to use a RPN calculator, learn how and buy this.
I always carry my phone, but rarely my physical DM42 or “real” 42s.
You won’t regret getting this app.
Congratulations Thomas for all the work you have done over the years relating to the 42. You should be proud.
If you know how to use a RPN calculator, this IS the one to have and use. If you don’t know how to use a RPN calculator, learn how and buy this.
I always carry my phone, but rarely my physical DM42 or “real” 42s.
You won’t regret getting this app.
Congratulations Thomas for all the work you have done over the years relating to the 42. You should be proud.
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