Time Delay calculator vs RedoCalc
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Time Delay calculator
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A calculator that can display calculation results with a delay to practice mental arithmetic. >Mental arithmetic practice mode Tap the timer key to turn on mental math practice mode. Enter the formula as usual. *Tap the timer key again to turn off the mental arithmetic practice mode. Return to normal calculator mode.
RedoCalc
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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 ร.) If you tap โ=โ, 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
Verdict
The clearest difference is update cadence: RedoCalc at every 3 days against Time Delay calculator's fortnightly. Time Delay calculator's advantage is device support (3 vs 1) and iOS requirement (15.8.3 vs 18.0). On price, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Time Delay calculator ships an update fortnightly, RedoCalc every 3 days. The most recent releases landed on September 18, 2026 and September 8, 2026 respectively.
| Parameter | Time Delay calculator | RedoCalc |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly | Every 3 days โ better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod โ better | iPhone |
| Requires iOS | 15.8.3 โ better | 18.0 |
| Further details โ not scored | ||
| Size | 36 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideaki Uchikoshi | Toshiyuki Kuwabara |
In-app purchases
Time Delay calculator
No in-app purchases
RedoCalc
No in-app purchases
Questions
Is Time Delay calculator free?
Is RedoCalc free?
Do Time Delay calculator or RedoCalc have ads?
Which is updated more often, Time Delay calculator or RedoCalc?
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