# DuotingZ vs シャドディク

The clearest difference is in-app purchases: DuotingZ at none against シャドディク's 1. DuotingZ also leads on iOS requirement (10.0 vs 13.0). シャドディク's advantage is update cadence (daily vs weekly). On price, ads and device support there is nothing between them.

Both are free to download. シャドディク sells 1 in-app purchase, starting at $9.99 per month. DuotingZ asks for nothing beyond the download.

DuotingZ ships an update weekly, シャドディク daily. Both last shipped on October 7, 2026.

## The numbers

| Metric | DuotingZ | シャドディク |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/duotingz/id1438273099/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Daily** |
| Monetization | Free | — |
| Size | 33 MB | 108 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OMTea App](https://appshunter.io/developer/1155973880) | [StudyPeaks](https://appshunter.io/developer/901134689) |

## What reviewers say

### DuotingZ

[App page](https://appshunter.io/ios/app/duotingz/id1438273099)

This app allows users to repeatedly play audio files from their iPod library, including albums, audiobooks, and podcasts. It features adjustable playback speeds, sound wave visualization, and speech recognition in 58 languages. The app also supports background playback and remote control functionality.

**Highlights:** iPod library integration, Adjustable playback speed, Repeat playback options, Speech recognition (58 languages), Sound wave visualization, Background playback, Remote control

**Features:** macOS Compatibility

**In-app purchases:** none


### シャドディク

[App page](https://appshunter.io/ios/app/toeic/id6749894258)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $9.99 | per month |


## Frequently asked questions

### Is DuotingZ free?

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

### Is シャドディク free?

シャドディク is free to download, with in-app purchases available.

### Do DuotingZ or シャドディク have ads?

Neither DuotingZ nor シャドディク shows ads.

### Which is updated more often, DuotingZ or シャドディク?

DuotingZ ships an update weekly, and シャドディク daily. Most recently, DuotingZ was updated on October 7, 2026 and シャドディク on October 7, 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.*