# Twin Calculator -Dual Calc- — Two Calculators, One App

> Dual calculator app for simultaneous calculations and result transfer. (iPhone/iPad app by R.E.O. Factory.)

- Source: https://appshunter.io/ios/app/twin-calculator-dual-calc/id1021097277 (this page in markdown: same URL + `.md`)
- Developer: [R.E.O. Factory](https://appshunter.io/developer/435344117)
- Category: Productivity, Utilities
- Price: Free
- Rating: 3.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 8 MB
- Languages: American English, Japanese
- Released: 2015-07-28
- Data updated: 2026-11-06
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/twin-calculator-dual-calc/id1021097277/reviews.md

## What is Twin Calculator?

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

## Key features

- Two independent calculators
- Transfer results between calculators
- Supports parentheses and percentages
- Displays formulas and results
- Adapts to light/dark mode
- High precision calculations

## Is Twin Calculator safe?

Not enough ratings yet to assess Twin Calculator.

## Is Twin Calculator legit?

Twin Calculator -Dual Calc- appears to be a legitimate app. The AppsHunter Legitimacy Score for Twin Calculator is 90 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/twin-calculator-dual-calc/id1021097277/reviews.md

### 1/5 — Calculator?

*2015-12-16*

If you like calculators that can't do problems with % or anything like 10-.5 (it crashes) then you'll love this one

## Frequently asked questions about Twin Calculator

### What is Twin Calculator?

Twin Calculator provides two independent calculators within one app. You can perform separate calculations on each and easily transfer results between them without re-entering numbers, making complex tasks more efficient.

### How do I switch between calculators on Twin Calculator?

On iPhone, you can swipe across the display area to switch between the MAIN (blue) and SUB (green) calculators. On iPad, both calculators can be viewed side-by-side.

### Can I transfer results between the two calculators in Twin Calculator?

Yes, you can send a result from the MAIN calculator to the SUB calculator, or vice versa. This feature is designed to help you reuse calculation results easily.

### What calculation features does Twin Calculator offer?

Twin Calculator supports addition, subtraction, multiplication, division, calculations with parentheses, percentage calculations, and storing constants. It also displays both formulas and results.

### Does Twin Calculator have ads?

Yes, Twin Calculator contains advertisements. It is offered for free, with ads supporting its continued development and availability.

### Is Twin Calculator suitable for complex calculations?

Yes, Twin Calculator offers improved calculation precision, retaining higher precision for intermediate calculations and displaying results with up to 10 decimal places. This helps maintain accuracy during continuous calculations and transfers.

### What devices is Twin Calculator available on?

Twin Calculator is available on iPhone, iPad, and iPod. It is designed to adapt to your device's screen size and orientation.

### How often is Twin Calculator updated?

The latest version of Twin Calculator is 2.0.0, last updated on October 29, 2026. While specific update frequency isn't detailed, this indicates ongoing support.

## Version history (last 4 releases)

### 2.0.0 — 2026-10-29

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!

### 1.0.2 — 2016-04-17

This app has been updated by Apple to display the Apple Watch app icon.

Bug fix

### 1.0.1 — 2016-03-02

Fixed some bugs

### 1.0.0 — 2015-07-28

No release notes.

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All apps by R.E.O. Factory: https://appshunter.io/developer/435344117

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-06.*