About Plus42
Plus42 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...
Plus42 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.
Fixed potential crash in VARMENU.
Previous Versions
Here you can find the changelog of Plus42 since it was posted on our website on 2022-05-09 08:32:53.
The latest version is 1.3.13 and it was updated on 2026-06-17 10:28:02. See below the changes in each version.
Plus42 version 1.3.13
Updated At: 2026-01-14
Changes: Fixed potential crash in VARMENU.
Plus42 version 1.3.10
Updated At: 2025-07-03
Changes: Jul 3, 2025
Version 1.3.10
Fixed a couple of rare crashes.
Plus42 version 1.3.7a
Updated At: 2025-06-01
Changes: Jun 1, 2025
Version 1.3.7a
Now hiding shadowed labels from MVAR catalogs.
Fix for certain rare crashes.
Plus42 version 1.3.5
Updated At: 2025-05-13
Changes: May 13, 2025
Version 1.3.5
Fixed a couple of equation editor bugs.
Plus42 version 1.3.3
Updated At: 2025-04-29
Changes: Apr 29, 2025
Version 1.3.3
BASE menu: Implemented SLN, SRN, and ASRN. These functions are can be typed as Shift-SL, Shift-SR, and Shift-ASR, respectively, and RJ can now be typed as Shift-LJ.
More accurate DET, INVRT, and matrix division for 2x2 matrices.
When spelling out built-in function names, '-' is now accepted as an alternative for '→', to make conversion functions easier to type.
Menu keys that execute different functions when pressed with Shift now show their alternate function while Shift is active. (This behavior can be disabled and enabled using the new STATIC and DYNAMIC settings in the new MENUS submenu of the MODES menu.)
Decimal version: BS→N and BD→N were rounding their results to 16 digits. Fixed.
Plus42 version 1.3.2
Updated At: 2025-04-25
Changes: Apr 25, 2025
Version 1.3.2
(1.3) BASE enhancements: shift and rotate functions, bit manipulation functions, floating-point conversions, and optional digit grouping. See the Free42 web site for all the details.
(1.3.1) BASE: Fixed DECINT behavior for -2^(WSIZE-1).
(1.3.2) RLN, RRN, RLCN, and RRCN did not drop the stack. Fixed.
(1.3.2) Fixed a couple of bugs in the equation editor.
Plus42 version 1.2.8
Updated At: 2025-04-18
Changes: Apr 18, 2025
Version 1.2.8
NEWEQN and EDITEQN functions (EQN.FCN menu). These create or edit equations and strings in place, in the stack and in programs, without needing to go through EQN mode.
Moved equation settings from MODES to EQN.FCN, and moved BASE settings from MODES to BASE, to make them easier to find and to declutter the MODES menu.
Plus42 version 1.2.6
Updated At: 2025-02-19
Changes: Feb 19, 2025
Version 1.2.6
Fixed crash when saving an equation without having modified it. This bug was introduced in the previous release.
Improvements in error handling when evaluating equations.
Plus42 version 1.2.2
Updated At: 2025-01-27
Changes: Jan 27, 2025
Version 1.2.2
User-defined units with SI prefixes didn't work in the CUSTOM menu. Fixed.
Plus42 version 1.1.17
Updated At: 2024-12-22
Changes: Dec 22, 2024
Version 1.1.17
Fixed pasting of GETMI, PUTMI, GETLI, and PUTLI.
Added ALPHA mapping from Y^X to '↑'.
Fixed crash with circular unit definitions.
Disclaimer
Official App Store Link
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