Retro 15C app icon

Apps Like Retro 15C for iPhone and iPad

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.

by Greg Hewgill★ 4.3228 ratingsUtilitiesFreeData updated 2026-09-08

Retro 15C screenshots

Ranked alternatives

Showing 321–340 of 1,000 ranked alternatives.

  1. Circuit Playground app icon

    Circuit Playground

    Adafruit Industries LLC

    Calculate component values and resistor codes

    Calculate component values for Op Amp, 555, RC Filter, and Resistor Divider circuits. Decode resistor and capacitor codes. Compute power, resistance, current, and voltage using Ohm's Law and Power Calculators.

    ★ 4.319 ratingsUtilities$2.99Data updated 2026-09-08
  2. Machinist Calc Pro app icon

    Machinist Calc Pro

    Calculated Industries, Inc.

    Machining math and reference tool.

    The app provides machining math and reference solutions for design, layout, and production setup. It offers calculations for speeds and feeds, thread sizes, drill sizes, and trigonometric functions.

    ★ 4.826 ratingsUtilities$24.99Data updated 2026-10-09
  3. bcRPN app icon

    bcRPN

    Paul Wilkins

    ★ 4.85 ratingsUtilitiesFreeData updated 2026-09-06
  1. Boating Calcs app icon

    Boating Calcs

    Calculated Industries, Inc.

    Calculate metrics and units

    Perform calculations and unit conversions with over 120 formulas. Save and retrieve calculation results. Add frequently used calculators to a favorites list. Email calculation inputs and outputs. Search for specific calculations or references.

    ★ 4.827 ratingsUtilities$1.99Data updated 2026-09-08
  2. x36 app icon

    x36

    Carl Cook

    ★ 5.02 ratingsUtilities$0.99Data updated 2026-09-16
  3. Statistics AI: Homework Solver app icon

    Statistics AI: Homework Solver

    Renaissance Apps LLC

    Solve stats problems with AI

    Allows users to upload or snap a photo of a problem for instant solutions. It provides detailed, accurate explanations and breaks down complex calculations into clear steps.

    ★ 4.834 ratingsEducationFreeData updated 2026-09-06
  4. DB40X app icon

    DB40X

    Christophe de Dinechin

    ★ 5.04 ratingsProductivityFreeData updated 2026-09-06
  5. Datum app icon

    Datum

    John Diamond

    ★ 5.03 ratingsUtilities$2.99Data updated 2026-09-06
  6. Machinist Journeyman app icon

    Machinist Journeyman

    James Rowe

    Manage tools, track projects, and organize workflows

    Perform machine shop calculations for diameters, angles, and threads. Convert between imperial and metric units. Access formulas for gear ratios and thread pitch. Store and retrieve frequently used values. Export results in printable format.

    ★ 4.319 ratingsBusiness$9.99Data updated 2026-11-13
  7. Electrical Converter app icon

    Electrical Converter

    V PUGAZHENTHI

    Convert units, calculate values, switch categories

    Convert units across 16 categories with 173 units and 2162 conversions. Perform calculations for field strength, resistance, capacitance, and more. Access 62 calculators via in- purchase.

    ★ 4.031 ratingsUtilities$0.99Data updated 2026-09-08
  8. Rolled Paper Calculator app icon

    Rolled Paper Calculator

    Taizo Yamamoto

    Calculate expenses and track history

    Displays calculations in a scrollable format for easy review. Users can track calculation history, perform basic arithmetic, and use a scientific mode for advanced functions. Input and results are visible simultaneously for accuracy.

    ★ 4.828 ratingsFinanceFreeData updated 2026-09-08
  9. Ultra Measure Master app icon

    Ultra Measure Master

    Calculated Industries, Inc.

    Convert units between standard and metric systems

    Convert units between U.S. standard and metric systems. Calculate length, weight, volume, and temperature. Switch between imperial and metric measurements. Store frequently used conversions.

    ★ 5.08 ratingsUtilities$29.99Data updated 2026-09-08
  10. UniCount scientific calculator app icon

    UniCount scientific calculator

    DANIIL VOIDILOV, IE

    Calculate, store, and solve equations

    Solves math problems with support for multi-story fractions, powers, and roots. Calculates trigonometric functions and complex numbers. Stores expressions and answers. Switches between basic, , and fraction modes.

    ★ 4.914 ratingsUtilitiesFreeData updated 2026-09-10
  11. Test Prep : ALEKS® Math app icon

    Test Prep : ALEKS® Math

    Nikhil Kumar

    Practice problems and prepare for ALEKS assessments

    ALEKS offers personalized study plans based on user knowledge. It includes 500+ authentic ALEKS-style questions with step-by-step explanations. Users can take realistic knowledge checks that simulate the actual .

    ★ 4.25 ratingsEducationFreeData updated 2026-09-06
  12. Counting Train app icon

    Counting Train

    Mikhail Magurean

    Trace numbers, match sequences, count shapes

    Learn numbers and through interactive activities. Trace numbers up to 100, match numbers to sequences, and count geometric shapes. Provide feedback on answers and progress.

    ★ 4.412 ratingsEducationFreeData updated 2026-09-18

How we rank alternatives

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