Calculator83 vs RedoCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator83
A minimalist calculator app focused on simplicity and a clean workflow. It offers both basic and scientific modes, allowing users to perform calculations without complex settings. Get started quickly with this straightforward tool.
- Minimalist design
- Clean workflow
- Basic mode
- Scientific mode
- Easy to use
Read full descriptionHide full description
Calculator83 is a minimalist calculator designed with simplicity to the core and an emphasis on a clean workflow. Be up and running in seconds! Featuring two modes of operation, basic and scientific. The goal of this app is to allow users to have a powerful calculator without the fuss of learning all the settings of a powerful calculator.
RedoCalc
Read full descriptionHide 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
Verdict
The clearest difference is ads: Calculator83 at none against RedoCalc's shown. Calculator83 also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). RedoCalc's advantage is update cadence (every 3 days vs every 20 months). On price and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Calculator83 ships an update every 20 months, RedoCalc every 3 days. The most recent releases landed on October 14, 2026 and September 25, 2026 respectively.
| Parameter | Calculator83 | RedoCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 62.5% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 20 months | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 10 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Lyker Labs LLC | Toshiyuki Kuwabara |
In-app purchases
Calculator83
No in-app purchases
RedoCalc
No in-app purchases









