Comparison

Calculator vs RedoCalc

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

Head to head
About

Calculator

This utility app allows users to perform calculations and view the formulas used. It offers the ability to edit past calculations and share results via email or memos. An optional purchase can remove advertisements.

Highlights
  • View calculation formulas
  • Edit past formulas
  • Share calculations
  • Ad-free option via purchase
  • Output to memos or email
Features
Read full description

This is a calculator. You can see the formula. You can edit formulas later. To edit a formula, tap the place you want to edit. Purchasing an option allows you to turn off advertisements. Since there is a sharing function, you can output calculation formulas and results to memos or send them by e-mail.

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

Calculator3 screens
RedoCalc3 screens

Verdict

The call

The clearest difference is in-app purchases: RedoCalc at none against Calculator's 1. RedoCalc also leads on update cadence (every 3 days vs every 2 months). Calculator's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.0). On price and ads 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. Calculator sells 1 one-off in-app purchase. RedoCalc asks for nothing beyond the download.

UpkeepUpdate frequency

Calculator ships an update every 2 months, RedoCalc every 3 days. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Calculator versus RedoCalc: the parameters behind the verdict, then further details
ParameterCalculatorRedoCalc
PriceFreeFree
Rating3.7 (10 ratings) — better—
Positive reviews42.9% of reviews—
Number of ratings10 — better—
Update frequencyEvery 2 monthsEvery 3 days — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better18.0
Further details — not scored
Size4 MB3 MB
Age rating4+4+
DeveloperHideki OgawaToshiyuki Kuwabara

In-app purchases

1 purchases

Calculator

One-time1
  • Remove in-app ads$2.99
None

RedoCalc

No in-app purchases

Questions

Is Calculator free?
Calculator is free to download, with in-app purchases available.
Is RedoCalc free?
RedoCalc is free to download, with no in-app purchases.
Do Calculator or RedoCalc have ads?
Both Calculator and RedoCalc show ads.
Which is updated more often, Calculator or RedoCalc?
Calculator ships an update every 2 months, and RedoCalc every 3 days. Most recently, Calculator was updated on November 2, 2026 and RedoCalc on October 25, 2026.

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