172+ iOS apps curated and reviewed
The best rpn calc pro apps on iPhone average 4.4★ across 172+ titles — we've ranked them by what real users actually keep on their phones. Updated June 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | $2.99 | 5.0★ (1) | No | No | May 2026 |
| 2 |  | Free | 4.6★ (4.6K) | Yes | Yes | Jul 2026 |
| 3 |  | Free | 3.4★ (207) | Yes | Yes | Jul 2026 |
| 4 |  | $7.99 | 4.7★ (354) | No | No | Jul 2026 |
| 5 |  | Free | 5.0★ (1) | No | Yes | May 2026 |
| 6 |  | Free | — | No | No | May 2026 |
| 7 |  | $24.99 | 4.9★ (87) | No | No | Jul 2026 |
| 8 |  | $0.99 | 3.3★ (4) | No | No | Jul 2026 |
A professional scientific calculator utilizing Reverse Polish Notation for efficient calculations. It features a full stack display, comprehensive scientific functions, and a clean interface, ideal for engineers, scientists, and RPN enthusiasts.
This app offers a comprehensive suite of 10 powerful calculators and 10 financial worksheets, designed to handle everything from basic arithmetic to complex scientific and financial calculations. It includes features like unit conversion, currency exchange, graphing, and statistical analysis, making it a versatile tool for students and professionals.
This app offers a powerful RPN calculator with financial and scientific functions, mimicking popular industry-standard models. It includes programming capabilities and expandable flavors for diverse calculation needs.
This app offers ten powerful calculators, including scientific, graphing, and financial tools, along with numerous worksheets and conversion options. It's designed to handle complex calculations, currency conversions, and financial planning with advanced features and customizable displays.
This utility app offers a Reverse Polish Notation (RPN) calculator experience for iOS devices. It features customizable key layouts via swipe gestures and long-press options for stack items. External keyboard support is also available.
This advanced scientific and financial calculator utilizes the Reverse Polish Notation (RPN) system. It offers over 96 functions, catering to professionals with features for finance, programming, and general scientific calculations. Optimized for iOS devices, it provides a robust and accurate computational experience.
This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.
This app offers a fully functional scientific calculator and a notepad with automatic note-taking capabilities. Save your calculations and add custom content to notes for easy future reference. It supports multitasking features on iPad and offers optional upgrades for advanced functionality.
This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.
This app offers a free basic and scientific calculator with an intuitive interface. It supports fractions, percentages, and advanced editing. Optional upgrades provide specialized calculators for fractions with units, polynomial and linear equation solving, graphing, and geometric shapes.
A powerful calculator designed for professionals and students, offering advanced features like RPN mode, multi-line display, and extensive unit conversions. It supports various number systems and includes an Apple Watch app for on-the-go calculations.
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 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 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 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 app offers both basic and advanced scientific calculations with an intuitive interface designed for tablets and phones. It includes features like currency conversion, calculation history, and the ability to share results. An optional premium membership removes ads and provides enhanced support.
This scientific and financial calculator offers RPN input and a wide range of functions including complex numbers, equation solving, and statistical analysis. It also supports basic operations on Apple Watch.
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.
A programmable scientific calculator offering a classic aesthetic with modern functionality. It features a dynamic stack display, customizable buttons, and support for multiple data types, making complex calculations intuitive and accessible.