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  • Twin Calculator -Dual Calc- screenshot 1
  • Twin Calculator -Dual Calc- screenshot 2
  • Twin Calculator -Dual Calc- screenshot 3

About Twin Calculator -Dual Calc-

Two Calculators. One App. Twin Calculator is a versatile calculator app that lets you use two independent calculators in one convenient place. With MAIN and SUB, you can perform separate calculations and transfer results from one calculator to the other without entering the numbers again. ■ Two Calculators, One Convenient Experience MAIN is blue. SUB is green. On iPhone, simply swipe across the display area to switch between the two calculators. On iPad, use both calculators side by side in portrait or landscape orientation. ■ Transfer Results Between Calculators Send a result from MAIN to SUB, or from SUB to MAIN. Easily reuse calculation results without memorizing or retyping numbers. Perfect for working with multiple calculations. ■ Useful Calculation Features • Addition, subtraction, multiplication, and division • Calculations with parentheses • Percentage calculations • Store and recall α and β constants • Display both formulas and results • Calculations involving decimals and negative numbers ■ A Fresh, Easy-to-Use Design Enjoy rounded buttons, spacious formula displays, and a clean interface designed for everyday use. The app automatically adapts to your device's Light or Dark Mode setting. ■ Improved Calculation Precision Intermediate calculations retain higher precision, while results are displayed with up to 10 decimal places. Calculation values are kept separate from formatted display text, helping maintain precision during continuous calculations and transfers. Whether you're shopping, managing your budget, working, or studying, Twin Calculator makes everyday calculations more convenient. Discover the flexibility of having two calculators in one app. REO Factory

What’s new

Version 2.0.0 · Updated October 29, 2026

Twin Calculator has been completely refreshed! • Redesigned MAIN (blue) and SUB (green) calculators • Added automatic Light and Dark Mode support • Side-by-side calculators on iPad in both portrait and landscape • Improved calculation precision and result transfers • Enhanced decimal point and operator input • Better support for negative numbers and parentheses • Improved compatibility with the latest iOS versions • Overall stability and usability improvements Thank you for using Twin Calculator!

App privacy

The developer, R.E.O. Factory, reported these privacy practices to Apple.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers: Device ID

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Location: Coarse Location
  • Identifiers: Device ID
  • Usage Data: Product Interaction, Advertising Data
  • Diagnostics: Performance Data

Used for: Third-Party Advertising, Developer’s Advertising or Marketing, Analytics, App Functionality

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Diagnostics: Other Diagnostic Data, Crash Data

Used for: Third-Party Advertising, Analytics

Alternatives to Twin Calculator -Dual Calc-

Looking for apps like Twin Calculator -Dual Calc-? Here are 6 similar apps on the App Store. The highest rated is Calculator of Formulas (5.0/5), and all 6 are free to download.

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