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Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer.

This is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image. Free42 is an Open Source project. 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. Different skins are also available.

What's New

Version 1.5.5:
  • Decimal version: entering a number with an empty exponent (e.g., 1E or 1E-) would yield Not a Number. Fixed.
  • iPhone version: HTTP server: Fixed downloading individual programs from, and uploading zip files of programs to, the /memory directory. This got broken in release 1.4.77, while implementing local file download.
  • Android version: when the screen


  • OS X 10.6 or later

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5 2


Current Version (1.x)


Downloads 1,873
Version Downloads 453
License Free
Date 13 Nov 2014
Platform OS X / Intel 32
Price Free
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