# RedCrab Calculator vs Modulo Calculator, iCalcModulo

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.

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.

## The numbers

| Metric | RedCrab Calculator | Modulo Calculator, iCalcModulo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/modulo-calculator-icalcmodulo/id6443557633/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 5 MB | 14 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [Takao Ichimura](https://appshunter.io/developer/1474061593) |

## What reviewers say

### RedCrab Calculator

[App page](https://appshunter.io/ios/app/redcrab-calculator/id947845140)

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.

**Highlights:** Basic & Advanced Calculations, Smart Expression Parsing, Calculation History & Reuse, High-Precision Display, Dark Mode & Modern UI, VIP Ad-Free Experience

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 终身会员 | $1.99 | one-time |


### Modulo Calculator, iCalcModulo

[App page](https://appshunter.io/ios/app/modulo-calculator-icalcmodulo/id6443557633)

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.

**Highlights:** Division remainder calculation, Calculation history, Formula display, Clipboard copy/paste, Percent calculations, Familiar calculator operation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RedCrab Calculator free?

RedCrab Calculator is free to download, with in-app purchases available.

### Is Modulo Calculator, iCalcModulo free?

Modulo Calculator, iCalcModulo is free to download, with no in-app purchases.

### Do RedCrab Calculator or Modulo Calculator, iCalcModulo have ads?

Both RedCrab Calculator and Modulo Calculator, iCalcModulo show ads.

### Which is updated more often, RedCrab Calculator or Modulo Calculator, iCalcModulo?

RedCrab Calculator ships an update fortnightly, and Modulo Calculator, iCalcModulo every 6 weeks. Most recently, RedCrab Calculator was updated on October 15, 2026 and Modulo Calculator, iCalcModulo on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*