# RedCrab Calculator vs QR Code Scanner and Reader

The clearest difference is in-app purchases: QR Code Scanner and Reader at none against RedCrab Calculator's 1. QR Code Scanner and Reader also leads on iOS requirement (8.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase. QR Code Scanner and Reader asks for nothing beyond the download.

RedCrab Calculator ships an update fortnightly, QR Code Scanner and Reader every 2 weeks. The most recent releases landed on October 24, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | QR Code Scanner and Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/qr-code-scanner-and-reader/id1250554899/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 5 MB | 4 MB |
| Requires iOS | 15.6 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [usman hamid](https://appshunter.io/developer/1168352618) |

## 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 |


### QR Code Scanner and Reader

[App page](https://appshunter.io/ios/app/qr-code-scanner-and-reader/id1250554899)

Easily scan QR codes by simply pointing your device at them. The application automatically detects and reads any QR code presented to it.

**Highlights:** Automatic QR code detection, Simple point-and-scan interface, Reads any QR code

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is QR Code Scanner and Reader free?

QR Code Scanner and Reader is free to download, with no in-app purchases.

### Do RedCrab Calculator or QR Code Scanner and Reader have ads?

Both RedCrab Calculator and QR Code Scanner and Reader show ads.

### Which is updated more often, RedCrab Calculator or QR Code Scanner and Reader?

RedCrab Calculator ships an update fortnightly, and QR Code Scanner and Reader every 2 weeks. Most recently, RedCrab Calculator was updated on October 24, 2026 and QR Code Scanner and Reader on October 5, 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.*