RPN 28x Calc app icon

Apps Like RPN 28x Calc for iPhone and iPad

Enter expressions and calculate results

Is a programmable scientific calculator with a dynamic stack display. Users can input numbers and operations using reverse-polish notation. The display expands automatically as more values are added, and users can swipe to view additional lines.

by Eric Roller★ 5.034 ratingsProductivity$6.99Data updated 2026-09-08

RPN 28x Calc screenshots

Ranked alternatives

Showing 1–20 of 1,000 ranked alternatives.

  1. RPN Calculator 48 app icon

    RPN Calculator 48

    Tom Kerrigan

    Calculate with swipe gestures and large buttons

    Perform calculations using reverse Polish notation. Swipe to undo or redo operations. Access a 100-entry stack and 6 memory buttons. View large, easy-to-read displays. Save state on exit. Supports scientific functions and multiple undo/redo levels.

    ★ 4.8242 ratingsUtilities$3.99Data updated 2026-09-08
  2. Crimson Calculator 41cx app icon

    Crimson Calculator 41cx

    Crimson Research, Inc.

    Program and store calculations

    A programmable RPN with continuous memory allows users to access the stack and LASTx using STO and RCL commands. It supports 200-2000 lines of program memory and label addressing with strings.

    ★ 5.03 ratingsEducation$4.99Data updated 2026-09-08
  3. Complex RPN Calculator app icon

    Complex RPN Calculator

    John Coddington

    Scientific RPN calculator with complex numbers.

    The app is a scientific RPN calculator. It has a four-level stack and complex numbers as its native number type.

    ★ 3.924 ratingsUtilitiesFreeData updated 2026-09-10
  1. GO-21 SciRPN app icon

    GO-21 SciRPN

    Steve Lidie

    Calculate using RPN and stack registers

    Simulates a retro scientific calculator with RPN input. Features a 10-digit LED display, four stack registers, and a storage register. Includes math, trigonometric, and logarithmic functions. Displays results in polar/rectangular formats.

    ★ 4.913 ratingsUtilities$2.99Data updated 2026-09-08
  2. GO-25 SciRPN app icon

    GO-25 SciRPN

    Steve Lidie

    Calculate with RPN and stack registers

    Simulates a programmable scientific calculator with RPN input. Features a 10-digit LED display, four stack registers, and ten storage registers. Includes math, trigonometric, and statistical functions.

    ★ 4.723 ratingsUtilities$4.99Data updated 2026-09-08
  3. PCalc app icon

    PCalc

    TLA Systems Ltd.

    Calculate, convert, and program with precision

    Perform complex calculations with scientific, engineering, and hexadecimal modes. Use RPN and multi-line display. Convert units and access constants. Undo and redo actions. Sync with Apple Watch for on-the-go calculations.

    ★ 4.7779 ratingsUtilities$9.99Data updated 2026-11-13
  4. Calculator‰ app icon

    Calculator‰

    Tim O's Studios, LLC

    Calculate with large buttons and clear display

    A calculator with large buttons and a clear display for efficient calculations. Supports basic arithmetic operations. Includes a Retina Display for improved visibility.

    ★ 4.9409,196 ratingsUtilitiesFreeData updated 2026-09-08
  5. Basic Calculator+ app icon

    Basic Calculator+

    Christie Clark

    Calculate with large buttons and clear display

    A calculator with a clear display and large buttons supports functions. Switch between portrait and landscape modes on iPad. Perform simple calculations without additional features.

    ★ 4.9258,702 ratingsUtilitiesFreeData updated 2026-09-08
  6. RPN Calculus app icon

    RPN Calculus

    Thomas Braun

    Scientific RPN calculator for iPad.

    The app performs calculations with up to 15 digits of precision and supports a number range from -1E127 to 1E127. It includes a database of over 120 scientific constants that users can extend.

    ★ 4.01 ratingsUtilities$1.99Data updated 2026-09-14
  7. Big Button Calculator Pro Lite app icon

    Big Button Calculator Pro Lite

    Cider Software LLC

    Calculate with dual-line display and color themes

    Calculate with a dual-line display showing input and result simultaneously. Use percentage and backspace functions. Switch between 18 color themes. Enter multi-line equations. Automatically format scientific expressions.

    ★ 4.714,055 ratingsUtilitiesFreeData updated 2026-09-11
  8. MathU RPN Calc app icon

    MathU RPN Calc

    Creative Creek, LLC

    Calculate with RPN and 96 functions

    Perform complex calculations using Reverse Polish Notation. Access over 96 functions including financial, scientific, and engineering operations. Store and recall values. Switch between decimal and hexadecimal modes.

    ★ 5.0135 ratingsFinance$24.99Data updated 2026-09-08
  9. Calculator - Pad Edition app icon

    Calculator - Pad Edition

    Ratha Sou

    Calculate in portrait, science in landscape

    Perform basic calculations in portrait mode and scientific calculations in landscape. Use root, power, factorial, exponential, division, logarithm, and trigonometric functions. Features a flat UI design similar to built-in iOS apps.

    ★ 4.7357,788 ratingsUtilitiesFreeData updated 2026-09-08
  10. Calculator HD Pro Lite app icon

    Calculator HD Pro Lite

    Cider Software LLC

    Calculate with dual-line display and multi-line input

    A with dual-line display showing input and result. Supports multi-line equations and tap-to-move cursor. Saves calculation history with timestamps and labels. Allows emailing calculations and swiping to review previous entries.

    ★ 4.651,412 ratingsUtilitiesFreeData updated 2026-09-08
  11. Retro 15C app icon

    Retro 15C

    Greg Hewgill

    Calculate complex numbers and matrices

    Perform complex number calculations and trigonometric functions. Handle matrix operations and numerical root finding. Calculate integrals and statistical values including linear regression. Write and execute custom programs. No ads or in- purchases.

    ★ 4.3228 ratingsUtilitiesFreeData updated 2026-09-08
  12. The Best Calculator - Calc Pro app icon

    The Best Calculator - Calc Pro

    Panoramic Software Inc.

    Calculate and manage financial data

    Perform complex calculations using 10 built-in calculators including scientific, financial, and unit conversion tools. Access 10 financial worksheets for budgeting, loans, and investments. Save and share calculation results.

    ★ 4.64,713 ratingsUtilitiesFreeData updated 2026-09-08
  13. ▸ Calculator + app icon

    ▸ Calculator +

    CAT VIET SOFTWARE DEVELOPMENT & MEDIA JSC

    Calculate, convert, and solve equations

    Perform complex calculations using 12 built-in calculators including scientific, financial, and unit conversion tools. Input formulas with three modes: standard, string, and RPN.

    ★ 4.7899 ratingsUtilities$1.99Data updated 2026-09-08
  14. PCalc Lite app icon

    PCalc Lite

    TLA Systems Ltd.

    Calculate with advanced scientific functions

    Perform complex calculations with support for hexadecimal, octal, and binary. Use RPN mode and multi-line display. Access unit conversions, constants, and scientific notation. View a paper tape and use multiple undo/redo functions.

    ★ 4.4214 ratingsUtilitiesFreeData updated 2026-09-08

How we rank alternatives

Apps are ranked by functional similarity, category fit, rating confidence, and popularity.