# Write ID vs Hidden Device Detector Privacy

The clearest difference is in-app purchases: Write ID at none against Hidden Device Detector Privacy's 2. Write ID also leads on iOS requirement (9.0 vs 17.6). Hidden Device Detector Privacy's advantage is update cadence (daily vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Hidden Device Detector Privacy sells 2 in-app purchases, starting at $4.99 per 7 days. Write ID asks for nothing beyond the download.

Write ID ships an update every 6 weeks, Hidden Device Detector Privacy daily. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Write ID | Hidden Device Detector Privacy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Daily** |
| Size | 1 MB | 8 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Shenzhen Chileaf Eletronics Co., LTD](https://appshunter.io/developer/1460339012) | [鹏 李](https://appshunter.io/developer/1817671603) |

## What reviewers say

### Write ID

[App page](https://appshunter.io/ios/app/write-id/id1494859636)

**In-app purchases:** none


### Hidden Device Detector Privacy

[App page](https://appshunter.io/ios/app/hidden-device-detector-privacy/id6752509604)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Annual Premium | $24.99 | per year |


## Frequently asked questions

### Is Write ID free?

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

### Is Hidden Device Detector Privacy free?

Hidden Device Detector Privacy is free to download, with in-app purchases available.

### Do Write ID or Hidden Device Detector Privacy have ads?

Neither Write ID nor Hidden Device Detector Privacy shows ads.

### Which is updated more often, Write ID or Hidden Device Detector Privacy?

Write ID ships an update every 6 weeks, and Hidden Device Detector Privacy daily. Most recently, Write ID was updated on September 30, 2026 and Hidden Device Detector Privacy on October 9, 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.*