Comparison

T vs e

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

Head to head
About

T

This app offers a dual calculator interface, allowing side-by-side or stacked calculations. Easily transfer results between calculators with a single touch for complex computations. It displays formulas for clarity and allows copying results to your device's memory.

Highlights
  • Two calculators in one
  • Copy and paste results between calculators
  • Input results from one calculator to another
  • Formula display
  • Copy results to device memory
  • Supports basic arithmetic operations
Features
Read full description

A simple and easy-to-use calculator app that combines two calculators into one. Calculators are displayed side by side when the screen is horizontal, and vertically when the screen is vertical. In addition to being able to perform separate calculations with each calculator, calculation results can be also copy and paste with one touch, so you can perform other calculations during calculations, making it even more convenient to use than you might imagine. There is also a paid version without ads. Please try it first. https://apps.apple.com/jp/app/twin-calc/id1619292082 【feature】 1. Calculation results can be copy and paste between two calculators with one touch. 2. The result calculated can be input from one calculator to the other with one touch. ・When press the "→" key, the calculation result of the left calculator is entered at the end of the formula on the right calculator. ・When press the "←" key, the calculation result of the right calculator is entered at the end of the formula on the left calculator. 3. add, subtract, multiply and divide is performed. Do multiplication and division first, then add and subtract. 4. Display the formula The entered formula is displayed under the result, so you can easily check the operations. 5. Calculation results can be copied to iPhone’s memory Calculation results can be pasted into other apps as text , so transcription errors will not occur. Example of use When you find a product for 988 yen for 3 pieces and a product for 1245 yen for 4 pieces while shopping, you can easily calculate "Which is cheaper?" And “How cheaper?"with this calculator. 1) Use the left and right calculators to find the unit price of the product (unit price = product price/number). 2) Tap the "- key" and "arrow key" on either the left or right calculator to calculate the unit price difference. Limitations ・Answer can be calculated up to 9 digits, minimum 0.000000001.

About

e

Features
Read full description

e-CUBE redefines the way people think about Internet of Energy & IoT service. e-CUBE is designed to provide a smart, satisfied and safe service in your daily life. News feed delivers upgraded experience to easily manage your electricity data. The UI card design helps you control smart home appliances with a single tap on your smartphone. e-CUBE is not just a HEMS (Home Energy Management System). e-CUBE provides useful insights for greater energy savings and dozens of advanced IoE services for your family, making your life easier and safer.

Screenshots

T4 screens
e3 screens

Verdict

The call

T and e are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

T ships an update weekly, e fortnightly. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

ScorecardNo meaningful differences
T versus e: the parameters behind the verdict, then further details
ParameterTe
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews42.9% of reviews—
Number of ratings2 — better—
Update frequencyWeekly — betterFortnightly
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.013.0
Further details — not scored
Size5 MB84 MB
Age rating4+4+
DeveloperHiroyuki UedaNextDrive Co.

In-app purchases

None

T

No in-app purchases

None

e

No in-app purchases

Questions

Is T free?
T is free to download, with no in-app purchases.
Is e free?
e is free to download, with no in-app purchases.
Do T or e have ads?
Neither T nor e shows ads.
Which is updated more often, T or e?
T ships an update weekly, and e fortnightly. Most recently, T was updated on October 6, 2026 and e on October 4, 2026.

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