# Useful QR Code Reader vs 計る！シンプル電卓

The clearest difference is device support: Useful QR Code Reader at 3 against 計る！シンプル電卓's 1. Useful QR Code Reader also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on September 26, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Useful QR Code Reader | 計る！シンプル電卓 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Weekly | Weekly |
| Size | 99 MB | 3 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [katapu.net](https://appshunter.io/developer/381898924) | [Searial, Inc.](https://appshunter.io/developer/1875914396) |

## What reviewers say

### Useful QR Code Reader

[App page](https://appshunter.io/ios/app/useful-qr-code-reader/id6738119243)

**Features:** macOS Compatibility

**In-app purchases:** none


### 計る！シンプル電卓

[App page](https://appshunter.io/ios/app/id6789937019)

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

**In-app purchases:** none


## Frequently asked questions

### Is Useful QR Code Reader free?

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

### Is 計る！シンプル電卓 free?

計る！シンプル電卓 is free to download, with no in-app purchases.

### Do Useful QR Code Reader or 計る！シンプル電卓 have ads?

Both Useful QR Code Reader and 計る！シンプル電卓 show ads.

### Which is updated more often, Useful QR Code Reader or 計る！シンプル電卓?

Useful QR Code Reader ships an update weekly, and 計る！シンプル電卓 weekly. Most recently, Useful QR Code Reader was updated on September 26, 2026 and 計る！シンプル電卓 on September 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.*