free42-decimal ☆
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Description:
HP-42S calculator simulator
Type: Cask  |  Latest Version: 3.3.11@0  |  Tracked Since: Dec 17, 2025
Links: Homepage  |  formulae.brew.sh
Category: Productivity
Tags: calculator rpn scientific simulation hp42s education
Install: brew install --cask free42-decimal
About:
Free42 is a precise simulation of the HP-42S RPN scientific calculator, faithfully replicating its functionality and appearance. The Decimal version uses decimal arithmetic to provide exact results, making it ideal for financial and engineering calculations where floating-point errors are unacceptable. It runs as a native application on macOS and includes features like unit conversions and a programmable equation library.
Key Features:
  • Exact decimal arithmetic for error-free calculations
  • Faithful HP-42S feature replication including programming
  • Native macOS application with a high-resolution display
  • Comprehensive unit conversion and physical constants libraries
Use Cases:
  • Financial calculations requiring exact decimal precision
  • Engineering and scientific problem-solving with RPN
  • Learning and using the classic HP-42S calculator logic
  • Running legacy HP-42S programs and software
Alternatives:
  • hp42s – A different emulator implementation, may not have native macOS UI
  • free42-binary – The binary floating-point version of Free42, less precise for financial use
  • emacs-free42 – Runs Free42 within Emacs, for users who prefer an editor-integrated workflow
Version History
Detected Version Rev Change Commit
Jan 13, 2026 7:04pm 3.3.11 0 VERSION_BUMP a777f40d
Sep 15, 2025 11:39am 3.3.8 0 VERSION_BUMP fb2ef123
Mar 30, 2024 9:33pm 3.1.7 0 VERSION_BUMP b981d702
Jan 17, 2024 8:35am 3.1.3 0 VERSION_BUMP b45ac7a3
Dec 1, 2023 11:23am 3.1.2 0 VERSION_BUMP 64edc8c2
Nov 29, 2023 11:10am 3.1.1 0 VERSION_BUMP 3423f2a0
Nov 15, 2023 2:02pm 3.1 0 VERSION_BUMP 2f910526
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