RPNPro is a calculator for software engineers. RPNPro uses RPN (Reverse Polish Notation) as an input scheme. The contents of the X register are always shown in decimal, hexadecimal and binary notation.

RPNPro alternatives

Gboard

Gboard is a new keyboard from Google for your iPhone. It has all the things you would expect from a great keyboard GIFs, emojis, and Glide Typing plus Google Search built in. None of these queries are sent to Google.

  • rating 2.34043

CP HexCalc

CP HexCalc is a FREE calculator with Hex, Decimal, Octal and Binary modes. Large buttons ensure that you dont press the wrong key and a large display means that you dont have to take out your reading glasses. Copy/paste has been implemented using gestures (swipe and double tap).See the screenshots below for further details.

  • size 2.0 MB

PCalc Lite

PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator. It includes an optional RPN mode and multi-line display, a choice of button layouts, an extensive set of unit conversions and constants, a paper tape, multiple undo and redo, engineering and scientific notation, as well as support for hexadecimal, octal, and binary calculations. Includes an Apple Watch app, so you can calculate on your wrist

  • rating 4.41667
  • size 70.9 MB

Retro 15C

Students and scientists from the 1980s will remember the classic RPN scientific calculators. These calculators strike a perfect balance between functionality and complexity. I love this calculator and I like to share.

  • rating 4.84
  • size 5.6 MB

Free42

Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer. It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image. The executables and source code are released under the terms of the GNU General Public License, version 2.All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors permission.

  • size 6.7 MB