RedCrab Calculator vs Modulo Calculator, iCalcModulo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RedCrab Calculator
This powerful scientific calculator offers a modern UI and robust engine for users of all levels. It handles basic arithmetic to complex engineering equations with smart expression parsing and a high-precision display. Enjoy a seamless calculation experience with features like history recall and dark mode.
- Basic & Advanced Calculations
- Smart Expression Parsing
- Calculation History & Reuse
- High-Precision Display
- Dark Mode & Modern UI
- VIP Ad-Free Experience
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The RedCrab Calculator is an efficient and powerful tool designed for students, engineers, professionals, and everyday users. Whether you're handling simple daily expenses or complex engineering algebra, it provides a precise and lightning-fast calculation experience. Combining an elegant modern UI with a robust calculation engine, every tap is a seamless experience. Key Features: - Basic & Advanced Calculations : Flawlessly supports basic arithmetic alongside advanced scientific functions including trigonometry (sin, cos, tan), logarithms (log, ln), exponents (^), roots (ⁿ√x), and modulo (%). - Smart Expression Parsing : Supports nested parentheses and long expression inputs. It strictly follows mathematical order of operations, displaying exactly what you calculate to ensure accuracy in complex equations. - History & Result Reuse : Automatically saves your calculation history. The dedicated "Ans" button allows you to instantly recall your last answer, making multi-step calculations a breeze. - High-Precision Display : Optimized large number display logic supports showing more significant digits, eliminating the frustration of forced and hard-to-read scientific notation. - Dark Mode & Modern UI : Native support for Dark Mode to protect your eyes. Carefully tuned button layouts, smooth highlight touch feedback, and dynamic font scaling deliver an ultimate user experience. - VIP Privileges : Unlock VIP membership to enjoy a pure, ad-free, immersive calculation experience, along with access to exclusive premium features. Scientific Calculator: Making numbers clearer and calculations smarter.
Modulo Calculator, iCalcModulo
This utility app provides a familiar calculator interface with the unique ability to calculate division remainders. It offers a calculation history, formula display, and clipboard functions for efficient use. Ideal for tasks requiring precise division with remainders.
- Division remainder calculation
- Calculation history
- Formula display
- Clipboard copy/paste
- Percent calculations
- Familiar calculator operation
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iCalcModulo is a simple and easy-to-use calculator with a familiar operation system, plus a remainder calculation function (division with a "remainder"). It can be calculated by the same operation as real calculators. (Compliant with calculator of company C) It also has functions unique to the calculator app, such as displaying calculation history and calculation formulas. There is ⓘ button to display the information page that describes instructions. Thank you for using iCalc. (Instructions) The operation for Arithmetic Calculations, Root Calculations, Constant Calculation and Independent Memory Calculation are the same as real general calculators. (Compliant with calculator of company C) The original operations and functions are as follows. - When performing division by pressing [MOD] instead of [÷] to calculate, the quotient and remainder will be displayed. The remainder is calculated so that it is greater than or equal to 0. - For example, when calculating the quotient and remainder of 30 ÷ 7, if you operate [3] [0] [MOD] [7] [=], the calculation result '4-2', which means the quotient is 4 and the remainder is 2, is displayed on the result display. - For example in a dispensing work, a calculation when counting 3 tablets a day and 90 days with 14 tablets per sheet is [3] [×] [9] [0] [MOD] [1] [4] [=], the result '19-4', which means 19 sheets and 4 tablets, is displayed. - If the result of calculation with the [MOD] key is used for the next calculation, the value of the quotient will be used. - After calculation with the [=] key, the result is displayed on the main display and a white frame is added. - If you tap an operator key instead of [=] key to calculate, the operator turns white, indicating that you are preparing for the next calculation. - The calculation formula is displayed below the main display. - Flipping the main display while inputting, the minimum digit of the displayed input value will be erased one by one. - Flipping the MR display for independent memory to erase the value in independent memory. - Call the calculation history with [▼older] key. Repeat tapping to call older history. If you called a calculation history that was too old, you can use [▲newer] key to return to newer history. - Tapping [C] key to erase the entered value. And [C] key changes to [AC] key. - Tapping [MR] key to enter the value of the independent memory. And [MR] key changes to [MC] key. - [copy] and [paste] keys for clipboard. - Percent Calculations What is 25% of 100? [1] [00] [×] [2] [5] [%] → 50 25% of what number is 100? [1] [00] [÷] [2] [5] [%] → 400 What is 100 increased by 25%? [1] [00] [+] [2] [5] [%] → 125 What is 100 decreased by 25%? [1] [00] [−] [2] [5] [%] → 75 (Others) - The calculation range is −999,999,999,999 ~ 999,999,999,999. - The maximum number of digits is 12. - The developer assumes no responsibility for any loss or claims by third parties which may arise from the use of this app.
Screenshots
Verdict
The clearest difference is review sentiment: RedCrab Calculator at 100% against Modulo Calculator, iCalcModulo's 50%. RedCrab Calculator also leads on update cadence (fortnightly vs every 6 weeks). Modulo Calculator, iCalcModulo's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 15.6). On price, ads 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
Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase. Modulo Calculator, iCalcModulo asks for nothing beyond the download.
RedCrab Calculator ships an update fortnightly, Modulo Calculator, iCalcModulo every 6 weeks. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.
| Parameter | RedCrab Calculator | Modulo Calculator, iCalcModulo |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | 少泽 梁 | Takao Ichimura |
Customer experience
RedCrab Calculator
Modulo Calculator, iCalcModulo
In-app purchases
RedCrab Calculator
- 终身会员$1.99
Modulo Calculator, iCalcModulo
No in-app purchases
Questions
Is RedCrab Calculator free?
Is Modulo Calculator, iCalcModulo free?
Do RedCrab Calculator or Modulo Calculator, iCalcModulo have ads?
Which is updated more often, RedCrab Calculator or Modulo Calculator, iCalcModulo?
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