SpeedCrunch is a high-precision scientific calculator that offers a fast and natural way to do mathematical calculations.
Best Plus42 Alternatives ranked by AI · updated Aug 2026
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Plus42 is a programmable RPN scientific calculator based on the Free42 engine, with additional functions and a larger feature set. It is intended for HP-calculator users who want Free42 compatibility plus broader mathematical and engineering capabilities.
Top 6 Plus42 alternatives
PCalc is a powerful calculator app for iOS and macOS with a customizable interface and advanced features.
Free42 is an open-source emulator of the HP-42S scientific programmable calculator for desktop and mobile platforms. It targets engineers, scientists, students, and...
Pros
- Accurately emulates the HP-42S instruction set and behavior
- Free and open source across multiple platforms
- Supports RPN programming, custom menus, and extensive mathematical functions
Cons
- Interface is less approachable than modern calculators such as PCalc
- Requires familiarity with HP-42S conventions and RPN workflows
- Does not provide a modern symbolic algebra system
Qalculate! is a versatile calculator with a focus on easy-to-use interface and extensive mathematical functions.
Pros
- Extensive mathematical functions
- User-friendly interface
Cons
- Less advanced than some competitors
- Occasional stability issues
5
Emu42
Christoph Giesselink
Emu42 is a Windows emulator for the HP-42S programmable scientific calculator. It is aimed at users who need close HP-42S behavior, programmable...
Pros
- Provides a desktop-focused HP-42S emulation experience
- Supports RPN programs and calculator-state workflows
- Runs well for users who prefer a resizable Windows application
Cons
- Primarily targets Windows rather than mobile and cross-platform users
- Interface is more utilitarian than Free42's polished mobile ports
- Smaller user community and documentation ecosystem than Free42
6
RPN Calculator
RPNCalc
RPN Calculator is a browser-based calculator built around reverse Polish notation and common scientific operations. It suits users who want quick RPN...
Pros
- Runs instantly in a browser with no installation
- Keeps RPN operation central rather than treating it as an optional mode
- Convenient for quick calculations on shared or locked-down computers
Cons
- Lacks Free42's HP-42S program compatibility
- Has fewer advanced functions and customization options than Free42
- Requires a browser and may be less useful offline
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