RPN-45 HD app icon

Apps Like RPN-45 HD for iPhone and iPad

Calculate like a scientific calculator

Simulate the HP-45 scientific calculator with photo-realistic visuals and animated keys. Perform all original functions and operations. Access a secret timer for 12-hour or 100-hour intervals. Switch to Super-45 mode for enhanced capabilities.

by Willy Kunz★ 4.86 ratingsProductivity$2.99Data updated 2026-09-08

RPN-45 HD screenshots

Ranked alternatives

Showing 41–60 of 1,000 ranked alternatives.

  1. Calcbot 2 app icon

    Calcbot 2

    Tapbots

    Review calculations and send them back

    Lets users perform calculations and convert units with an easy-to-read history tape and expression view. Save and reuse previous calculations. Convert between units intuitively. Sync with Apple Watch for on-the-go use.

    ★ 4.711,113 ratingsUtilitiesFreeData updated 2026-09-08
  2. 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
  3. Lightspeed Pocket (S) app icon

    Lightspeed Pocket (S)

    ShopKeep.com

    Access sales data and manage store locations

    Track sales and manage multiple store locations with real-time data access. Monitor cash flow and register activity. Set and track sales targets per store and team member. Switch between locations easily.

    ★ 4.76,521 ratingsBusinessFreeData updated 2026-09-08
  1. RPN-65 Pro app icon

    RPN-65 Pro

    Willy Kunz

    Simulate HP-65 calculator on iPad

    Simulate a programmable calculator with magnetic card input. Run original HP-65 programs. View detailed manuals and technical specifications. Adjust calculator settings and interface layouts. Export calculations and program data.

    ★ 4.04 ratingsProductivity$3.99Data updated 2026-09-10
  2. Studyable: AI Study Help app icon

    Studyable: AI Study Help

    Inter Platforms Pty Ltd

    Solve questions and chat with AI tutor

    Allows users to take photos of math problems and receive step-by-step solutions. It can plot graphs of equations. Users can chat with an AI tutor for homework and assignment .

    ★ 4.71,103 ratingsEducationFreeData updated 2026-09-06
  3. Calculator Max app icon

    Calculator Max

    Pavel Kozarek

    Calculations made easy in one app.

    The app offers basic and scientific calculators with a history tape. Users can make notes and draw ideas on iPad.

    ★ 4.31,925 ratingsUtilitiesFreeData updated 2026-09-13
  4. Audio Spectrum Analyzer dB RTA app icon

    Audio Spectrum Analyzer dB RTA

    Marina Polyanskaya

    Analyze and visualize frequencies

    Analyze frequencies with a real-time display. Adjust and visualize sound levels across different frequency ranges. Export analysis data and compare signals for accuracy. Calibrate equipment for optimal performance.

    ★ 4.53,039 ratingsMusicFreeData updated 2026-09-13
  5. GraphNCalc83 app icon

    GraphNCalc83

    Ernest Brock

    Calculate, graph, and edit math problems

    Solve math problems with natural textbook input and fraction support. Trace graphs with touch. Zoom using pinch gestures. Tap for regression analysis. Swipe to scroll through calculation history and matrices. Access help via the ? key.

    ★ 4.94,037 ratingsEducation$12.99Data updated 2026-10-20
  6. HiPER Scientific Calculator app icon

    HiPER Scientific Calculator

    Jindrich Houska

    Calculate and solve complex equations

    With symbolic algebra, equation solving, and calculus functions. Supports fractions, repeating decimals, and high-precision numbers. Displays results as simplified expressions or numerical values.

    ★ 4.6182 ratingsUtilitiesFreeData updated 2026-09-06
  7. CALC Smart Calculator ± app icon

    CALC Smart Calculator ±

    QApps LLC

    Calculate, convert, and solve equations

    Perform complex calculations with scientific formulas and unit conversions. Access calculation history via Spotlight and 3D Touch. Use widgets for quick access and history integration. Sync with Apple Watch for notifications and basic calculations.

    ★ 4.82,367 ratingsUtilitiesFreeData updated 2026-09-08
  8. jCalc – Scientific Calculator app icon

    jCalc – Scientific Calculator

    Jon Ericksen

    Calculate fractions and decimals instantly

    Solve mathematical problems with fraction, decimal, and equation input. Display results in decimal, rational, , or trigonometric formats. Support up to 16 decimal places for precise calculations.

    ★ 4.6258 ratingsUtilitiesFreeData updated 2026-09-09
  9. 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.

    ★ 4.7772 ratingsUtilities$9.99Data updated 2026-10-20
  10. Atomic Clock (Gorgy Timing) app icon

    Atomic Clock (Gorgy Timing)

    CompuLab

    Fetch precise time from servers

    Displays current time with high precision using an internet time protocol to sync with an time server. Users can set time zones, adjust display settings, and view time in 12-hour or 24-hour format.

    ★ 4.84,981 ratingsUtilities$1.99Data updated 2026-10-09
  11. RPN-38 CX app icon

    RPN-38 CX

    Willy Kunz

    Simulate HP-38C calculator operations

    Simulate the HP-38C calculator with real-time input and output. Perform financial calculations, program custom functions, and use reverse Polish notation. Supports HP-12C compatibility for most operations.

    ★ 5.06 ratingsProductivity$1.99Data updated 2026-09-10
  12. i41CX+ app icon

    i41CX+

    Antonio Lagana

    Programmable, expandable, calculate

    Perform complex calculations using RPN and CAS. Run custom programs and modules. Print or plot results via thermal printer. Import/export data in various formats. Access keyboard overlays and iOS features for enhanced functionality.

    ★ 4.8108 ratingsProductivity$24.99Data updated 2026-10-15
  13. Basic Calculator: Classic Calc app icon

    Basic Calculator: Classic Calc

    MobArts Ltd

    Calculate, split, and customize

    Perform general calculations including addition, subtraction, multiplication, division, and square roots. Use memory functions for storage and retrieval. Apply thousands separators and handle numbers up to 60 digits.

    ★ 4.83,214 ratingsUtilitiesFreeData updated 2026-09-08
  14. ▸ 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

How we rank alternatives

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