# Useful QR Code Reader vs Septendecuple Calc

The clearest difference is update cadence: Useful QR Code Reader at weekly against Septendecuple Calc's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

Useful QR Code Reader ships an update weekly, Septendecuple Calc every 2 weeks. The most recent releases landed on September 19, 2026 and August 3, 2026 respectively.

## The numbers

| Metric | Useful QR Code Reader | Septendecuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 2 weeks |
| Size | 99 MB | 36 MB |
| Requires iOS | **15.6** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [katapu.net](https://appshunter.io/developer/381898924) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## 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


### Septendecuple Calc

[App page](https://appshunter.io/ios/app/septendecuple-calc/id6742386411)

**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 Septendecuple Calc free?

Septendecuple Calc is free to download, with no in-app purchases.

### Do Useful QR Code Reader or Septendecuple Calc have ads?

Both Useful QR Code Reader and Septendecuple Calc show ads.

### Which is updated more often, Useful QR Code Reader or Septendecuple Calc?

Useful QR Code Reader ships an update weekly, and Septendecuple Calc every 2 weeks. Most recently, Useful QR Code Reader was updated on September 19, 2026 and Septendecuple Calc on August 3, 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.*