Description:
HP-42S calculator simulator
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Type: Cask
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Latest Version: 3.3.12@0
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Tracked Since: Dec 17, 2025
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Links:
Homepage |
formulae.brew.sh
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Category: Productivity
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Tags:
calculator
rpn
scientific
simulation
hp42s
education
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Install:
brew install --cask free42-decimal
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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.
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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
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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
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Alternatives:
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hp42s
– A different emulator implementation, may not have native macOS UI
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free42-binary
– The binary floating-point version of Free42, less precise for financial use
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emacs-free42
– Runs Free42 within Emacs, for users who prefer an editor-integrated workflow
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| Detected |
Version |
Rev |
Change |
Commit |
| May 4, 2026 10:12pm |
3.3.12 |
0 |
VERSION_BUMP |
8bc0b5dd |
| 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 |
| Apr 11, 2023 9:54am |
3.0.19a |
0 |
VERSION_BUMP |
022a6032 |
| Apr 6, 2023 4:45pm |
3.0.19 |
0 |
VERSION_BUMP |
aaffe301 |
| Mar 20, 2023 11:54am |
3.0.18 |
0 |
VERSION_BUMP |
726bdf09 |
| Dec 14, 2022 9:56pm |
3.0.17 |
0 |
VERSION_BUMP |
dd439e0d |
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