Comparison

Twin Calculator vs Showa100

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Twin Calculator

This app offers two independent calculators in a single interface, allowing for seamless transfer of results between them. It supports basic arithmetic, percentages, and parentheses, with a clean design that adapts to light and dark modes. Ideal for managing multiple calculations simultaneously.

Highlights
  • Two independent calculators
  • Transfer results between calculators
  • Supports parentheses and percentages
  • Displays formulas and results
  • Adapts to light/dark mode
  • High precision calculations
Features
Read full description

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

About

Showa100

Features
Read full description

Japanese Era Converter A simple app for converting years between the Japanese eras (Reiwa, Heisei, Showa) and the Western (Gregorian) calendar. Designed to lighten the workload for anyone who handles Japanese documents, this tool makes year conversion quick and easy with a simplified, user-friendly interface.

Screenshots

Twin Calculator4 screens
Showa1001 screens

Verdict

The call

The clearest difference is update cadence: Twin Calculator at every 7 months against Showa100's every 48 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Twin Calculator ships an update every 7 months, Showa100 every 48 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

Scorecard1 real difference · 9 level
Twin Calculator versus Showa100: the parameters behind the verdict, then further details
ParameterTwin CalculatorShowa100
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 7 months — betterEvery 48 months
AdsYesYes
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.6
Further details — not scored
Size8 MB5 MB
Age rating4+4+
DeveloperR.E.O. Factorykaitekidigital Inc.

In-app purchases

None

Twin Calculator

No in-app purchases

None

Showa100

No in-app purchases

Questions

Is Twin Calculator free?
Twin Calculator is free to download, with no in-app purchases.
Is Showa100 free?
Showa100 is free to download, with no in-app purchases.
Do Twin Calculator or Showa100 have ads?
Both Twin Calculator and Showa100 show ads.
Which is updated more often, Twin Calculator or Showa100?
Twin Calculator ships an update every 7 months, and Showa100 every 48 months. Most recently, Twin Calculator was updated on November 6, 2026 and Showa100 on November 7, 2026.

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