United StatesPlus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever. Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.
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.
United StatesNeed 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).
United StatesBeautiful 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.
United StatesPerfect!!
I use this calculator over all others. It has great precision and is easy to use, yet is powerfull. It is very well made. I couldn't find any bug or design defect. It's a very well thought app.
United StatesA perfect calculator
Great balance of features and simplicity for the ones who learned to love HP RPN calculators. This native re-implementation is much faster and more polished than the emulators running original HP firmware. Improvement opportunities: iOS keyboard for Alpha-entry, IRR calculations, built-in function documentation (with examples), modern UI for function catalog, larger function catalog, touch enabled high-res plot display with multiple functions in parallel, symbolic algebra.
United StatesThe best calculator-computer period
With some programming, this can replace both of my units conversion and finance calculators apps. It is that powerful. I hope - and still have not figured out - we could use and call the TVM variables (PMT, FV, etc) in our custom programs, rather than duplicate the already available functions.
United StatesSolid well implemented RPN calculator
This calculator is the one I use first. It's powerfull, excellently done and works allways as expected. Also, it's well maintained. I wish all apps were made with this quality level.
United States
fixed handling of direct-mapped "%" and "PI".
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