# Write ID vs Sentri

The clearest difference is in-app purchases: Write ID at none against Sentri's 1. Write ID also leads on iOS requirement (9.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sentri sells 1 in-app purchase, starting at $9.99 per month. Write ID asks for nothing beyond the download.

Write ID ships an update every 6 weeks, Sentri monthly. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Write ID | Sentri |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 1 MB | 3 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Shenzhen Chileaf Eletronics Co., LTD](https://appshunter.io/developer/1460339012) | [Akbarali Xasanov](https://appshunter.io/developer/6775700244) |

## What reviewers say

### Write ID

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

**In-app purchases:** none


### Sentri

[App page](https://appshunter.io/ios/app/sentri-wifi-device-scanner/id6790170844)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sentri Pro | $9.99 | per month |


## Frequently asked questions

### Is Write ID free?

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

### Is Sentri free?

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

### Do Write ID or Sentri have ads?

Neither Write ID nor Sentri shows ads.

### Which is updated more often, Write ID or Sentri?

Write ID ships an update every 6 weeks, and Sentri monthly. Most recently, Write ID was updated on September 30, 2026 and Sentri 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.*