Comparison

Kalc vs RedoCalc

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

Head to head
About

Kalc

This utility app offers a unit converter, calculator, and world clock. Its user-friendly interface is designed for quick access to everyday calculations and conversions.

Highlights
  • Unit converter
  • Calculator
  • World clock
  • Simple UI
  • Quick results
Features
Read full description

Unit Converter, Calculator, and World Clock. The simple & clean UI to get the results you need for everyday use as quickly as possible.

About

RedoCalc

Features
Read full description

This is a calculator for people who only use it for simple calculations, such as adding up receipts or calculating the cost of a meal split between several people, but who are always worried about whether the input was correct. As it is a simple calculator, the only operations it can perform are - Four arithmetic operations (addition, subtraction, multiplication, division) - Percentage calculations (including calculations such as consumption tax using percentages) . The results are displayed as numbers with a digit symbol. There is no complicated exponential display. The calculation proceeds in the order of the keys you enter. There is no priority for multiplication or division. The formulas you enter are displayed in order in the upper area as a history. If you tap the white part, it will turn yellow and you will be able to modify that part. (You can modify not only numbers, but also arithmetic symbols such as + and ×.) If you tap “=”, the expressions from the first line to the last line will be recalculated. The result will be automatically copied, so you can switch to other apps and paste the value there.

Screenshots

Kalc4 screens
RedoCalc3 screens

Verdict

The call

The clearest difference is ads: Kalc at none against RedoCalc's shown. Kalc also leads on iOS requirement (13.4 vs 18.0). RedoCalc's advantage is update cadence (every 3 days vs every 9 days). On price, 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

Kalc ships an update every 9 days, RedoCalc every 3 days. The most recent releases landed on June 1, 2026 and September 8, 2026 respectively.

Scorecard3 real differences · 7 level
Kalc versus RedoCalc: the parameters behind the verdict, then further details
ParameterKalcRedoCalc
PriceFreeFree
Rating4.7 (3 ratings) — better—
Positive reviews96.2% of reviews—
Number of ratings3 — better—
Update frequencyEvery 9 daysEvery 3 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS13.4 — better18.0
Further details — not scored
Size24 MB3 MB
Age rating4+4+
DeveloperYUTA OKAJIMAToshiyuki Kuwabara

In-app purchases

None

Kalc

No in-app purchases

None

RedoCalc

No in-app purchases

Questions

Is Kalc free?
Kalc is free to download, with no in-app purchases.
Is RedoCalc free?
RedoCalc is free to download, with no in-app purchases.
Do Kalc or RedoCalc have ads?
RedoCalc shows ads; Kalc does not.
Which is updated more often, Kalc or RedoCalc?
Kalc ships an update every 9 days, and RedoCalc every 3 days. Most recently, Kalc was updated on June 1, 2026 and RedoCalc on September 8, 2026.

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