# DUO LINK 4 vs IngredientGuard

The clearest difference is in-app purchases: DUO LINK 4 at none against IngredientGuard's 2. DUO LINK 4 also leads on iOS requirement (11.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. IngredientGuard sells 2 in-app purchases, starting at $1.99 per month. DUO LINK 4 asks for nothing beyond the download.

## The numbers

| Metric | DUO LINK 4 | IngredientGuard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.1 (498 ratings)](https://appshunter.io/ios/app/duo-link-4/id1103672387/reviews)** | — |
| Number of ratings | **498** | — |
| Positive reviews | 19.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 123 MB | 2 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [PNY](https://appshunter.io/developer/1103672386) | [Abdifatah Abdiwali Ahmed](https://appshunter.io/developer/1764333463) |

## What reviewers say

### DUO LINK 4

[App page](https://appshunter.io/ios/app/duo-link-4/id1103672387)

Manage and transfer files between your iOS device and a USB flash drive. Free up storage, back up data, and even charge your device. Supports a wide range of file formats for seamless integration.

**Highlights:** Free up iPhone/iPad space, Charge iOS devices, Back up contacts, Transfer photos and videos, Store photos directly, Manage files, Music and video playback

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Efficient file transfer
- 💡 Useful for freeing up phone storage
- 👍 Straightforward to use

**What reviewers complain about**

- 🐛 Frequent app crashes
- 🔍 Confusing or limited UI
- 🔌 Compatibility issues with newer devices
- 💾 Data loss or corruption

**Reported bugs**

- App fails to detect connected device
- Transferred files not visible or accessible
- Inconsistent behavior when renaming folders

**Requested features**

- Add 'select all' option for photos/files
- Support for more file formats
- Improve iPad app experience
- Integrate with native Files app


### IngredientGuard

[App page](https://appshunter.io/ios/app/ingredientguard/id6762025757)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Yearly | $14.99 | per year |


## Frequently asked questions

### Is DUO LINK 4 free?

DUO LINK 4 is free to download, with no in-app purchases.

### Is IngredientGuard free?

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

### Do DUO LINK 4 or IngredientGuard have ads?

Neither DUO LINK 4 nor IngredientGuard shows ads.

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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.*