249+ iOS apps curated and reviewed
Out of 249+ r47 rpn calculator apps on iOS, 12 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (19) | No | Yes | Aug 2026 |
| 2 |  | Free | 4.8★ (278) | No | No | Jul 2026 |
| 3 |  | Free | 3.8★ (22) | No | No | Jul 2026 |
| 4 |  | $3.99 | 4.8★ (238) | No | No | Aug 2026 |
| 5 |  | Free | 4.8★ (1.9K) | Yes | No | Aug 2026 |
| 6 |  | Free | 4.2★ (22) | No | Yes | Jul 2026 |
| 7 |  | Free | 4.8★ (3.6K) | No | No | Aug 2026 |
| 8 |  | $0.99 | — | No | No | May 2026 |
This scientific calculator uses Reverse Polish Notation (RPN) to help you break down complex problems. It offers a full 47-series instruction set with advanced functions and a program editor. The free version includes extensive tutorials and documentation.
This application is a faithful re-implementation of the HP-42S scientific calculator and its associated printer. It offers full functionality without requiring original HP ROM images and is an open-source project.
This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.
This app offers a scientific calculator with Reverse Polish Notation (RPN) functionality, providing an alternative to the default calculator. It features a large, easy-to-read display, a 100-entry stack, and extensive undo/redo capabilities. Its design is inspired by classic HP calculators.
This app functions as a scientific calculator, enabling users to input and edit complex formulas with ease. It supports formula history, variable memory, and various number system conversions for accurate calculations.
This app offers a powerful 3-in-1 calculator experience, combining scientific, graphing, and programmer functionalities. The scientific calculator is free, while graphing and programmer modes require an in-app purchase, with trials available for testing.
This app offers a versatile calculator with three distinct modes: Basic, Scientific, and Programmer. It provides a history view, sharing capabilities, and supports various input and output formats. The app is designed for iPhone, iPad, and iPod Touch.
This application provides a straightforward reverse Polish notation (RPN) calculator with essential functions and memory operations. It also includes integrated unit conversions for various measurements, allowing for quick conversions directly within the app. The calculator remembers your session, preserving all registers and memory values for future use.
This utility app offers a scientific calculator with Reverse Polish Notation (RPN) mode for faster calculations. Its simple interface is designed for engineers and scientists, providing efficient computation on iPhone devices.
This app emulates the legendary HP 12c financial calculator with a redesigned interface and modern look. It preserves the precision and reliability trusted by professionals, offering built-in financial tools for business, banking, real estate, and education.
This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.
This app offers a comprehensive suite of 12 calculators, including scientific, currency, unit, and finance functions. It features advanced modes, extensive formula support, and a user-friendly interface for all calculation needs.
This scientific calculator offers Reverse Polish Notation (RPN) for faster calculations. It includes 54 mathematical functions, coordinate conversions, and unit conversions, all within a simple interface.
This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.
A straightforward calculator utilizing Reverse Polish Notation (RPN) for everyday calculations. It offers a four-level visible stack with a total capacity of 100 positions, providing visual feedback on stack fullness. Basic arithmetic operations and stack manipulation functions are included.
This app emulates the functionality of the HP 12C Financial Calculator, offering all its features and more for mobile devices. It provides a reliable and convenient way to perform complex financial calculations on the go.
This scientific calculator utilizes Reverse Polish Notation (RPN) for efficient complex calculations, mirroring the functionality of classic HP calculators. It features a continuously visible stack for better tracking and includes 10 memory registers, plus a dedicated quadratic equation solver.
This utility app functions as a reverse Polish notation calculator. Users input numbers and operations using a stack-based interface to perform calculations. It's designed for straightforward mathematical tasks.
A minimalist reverse Polish notation calculator for iOS devices. It offers Standard, Binary, and Hex modes for quick calculations and programmer-friendly conversions, featuring a clean interface and a 4-level stack.