# Chlorine Dose Calculator vs QR Code Reader + Scanner App

The clearest difference is price: QR Code Reader + Scanner App at Free against Chlorine Dose Calculator's $4.99. QR Code Reader + Scanner App also leads on update cadence (every 2 weeks vs every 3 months). Chlorine Dose Calculator's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

QR Code Reader + Scanner App is free to download; Chlorine Dose Calculator costs $4.99 up front. QR Code Reader + Scanner App sells 2 in-app purchases, starting at $6.99 per 7 days. Chlorine Dose Calculator asks for nothing beyond the download.

Chlorine Dose Calculator ships an update every 3 months, QR Code Reader + Scanner App every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | Chlorine Dose Calculator | QR Code Reader + Scanner App |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.3 (13 ratings)](https://appshunter.io/ios/app/qr-code-reader-plus-scanner-app/id6791933337/reviews)** |
| Number of ratings | — | **13** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Freemium |
| Size | 1 MB | 33 MB |
| Requires iOS | 17.0 | **16.5** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) | [Prime Utility Studio](https://appshunter.io/developer/6791933339) |

## What reviewers say

### Chlorine Dose Calculator

[App page](https://appshunter.io/ios/app/chlorine-dose-calculator/id6761743091)

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

**In-app purchases:** none


### QR Code Reader + Scanner App

[App page](https://appshunter.io/ios/app/qr-code-reader-plus-scanner-app/id6791933337)

Instantly scan QR codes and barcodes to get product details, prices, and find items on other marketplaces. Automatically perform actions like opening websites or adding contacts. Create your own codes for links, Wi-Fi, and more, all saved in your history.

**Highlights:** Scan QR codes and barcodes instantly, View product details and prices, Find products on other marketplaces, Perform smart actions automatically, Create custom QR codes, Save scan history, Share created codes

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $6.99 | per 7 days |
| Premium Access | $9.99 | per 7 days |


## Frequently asked questions

### Is Chlorine Dose Calculator free?

Chlorine Dose Calculator costs $4.99, with no in-app purchases.

### Is QR Code Reader + Scanner App free?

QR Code Reader + Scanner App is free to download, with in-app purchases available.

### Do Chlorine Dose Calculator or QR Code Reader + Scanner App have ads?

Neither Chlorine Dose Calculator nor QR Code Reader + Scanner App shows ads.

### Which is updated more often, Chlorine Dose Calculator or QR Code Reader + Scanner App?

Chlorine Dose Calculator ships an update every 3 months, and QR Code Reader + Scanner App every 2 weeks. Most recently, Chlorine Dose Calculator was updated on October 31, 2026 and QR Code Reader + Scanner App on October 31, 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.*