# DUO LINK 4 vs DoKnotForget

The clearest difference is review sentiment: DoKnotForget at 100% against DUO LINK 4's 20%. DoKnotForget also leads on rating (5.0 vs 2.1). DUO LINK 4's advantage is in-app purchases (none vs 1) and ratings volume (498 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. DoKnotForget sells 1 one-off in-app purchase. DUO LINK 4 asks for nothing beyond the download.

DoKnotForget holds the better App Store score, 5.0 against 2.1. That said, the two scores are not equally well evidenced: DUO LINK 4 has 498 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 20% of DUO LINK 4's written reviews are positive against 100% of DoKnotForget's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | DUO LINK 4 | DoKnotForget |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.1 (498 ratings)](https://appshunter.io/ios/app/duo-link-4/id1103672387/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/doknotforget/id6760620237/reviews)** |
| Number of ratings | **498** | 1 |
| Positive reviews | 19.8% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 123 MB | 9 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PNY](https://appshunter.io/developer/1103672386) | [Jessica Downes](https://appshunter.io/developer/1827136479) |

## 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


### DoKnotForget

[App page](https://appshunter.io/ios/app/doknotforget/id6760620237)

Never miss an important date again. This app helps you remember birthdays, holidays, and other meaningful moments for the people you care about. It offers simple, thoughtful reminders to ensure you show up when it counts.

**Highlights:** Personalized reminders, Birthday tracking, Holiday notifications, Meaningful moment alerts, Simple setup, Clutter-free interface

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | one-time |


## Frequently asked questions

### Is DUO LINK 4 free?

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

### Is DoKnotForget free?

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

### Which has better reviews, DUO LINK 4 or DoKnotForget?

DoKnotForget is rated higher. DUO LINK 4 averages 2.1 out of 5 from 498 ratings, while DoKnotForget averages 5.0 from 1 ratings.

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

Neither DUO LINK 4 nor DoKnotForget shows ads.

### Which is updated more often, DUO LINK 4 or DoKnotForget?

DUO LINK 4 ships an update every 2 months, and DoKnotForget every 2 months. Most recently, DUO LINK 4 was updated on October 13, 2026 and DoKnotForget on October 2, 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.*