# iDoor vs USim OS

The clearest difference is update cadence: USim OS at weekly against iDoor's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iDoor ships an update monthly, USim OS weekly. Both last shipped on September 16, 2026.

## The numbers

| Metric | iDoor | USim OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/idoor/id1482528053/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | — |
| Size | 47 MB | 77 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Quanzhou Juhui Electronic Co., Ltd.](https://appshunter.io/developer/1482528052) | [Ruiyu Chen](https://appshunter.io/developer/1762343435) |

## What reviewers say

### iDoor

[App page](https://appshunter.io/ios/app/idoor/id1482528053)

Control your home's doors, windows, and appliances remotely via your phone. Monitor device status and view live camera feeds to manage your smart home environment.

**Highlights:** Remote device control, Live camera monitoring, WiFi and Bluetooth connectivity, Device status viewing, Share device access

**Features:** macOS Compatibility

**In-app purchases:** none


### USim OS

[App page](https://appshunter.io/ios/app/usim-os/id6740407423)

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

**In-app purchases:** none


## Frequently asked questions

### Is iDoor free?

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

### Is USim OS free?

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

### Do iDoor or USim OS have ads?

Neither iDoor nor USim OS shows ads.

### Which is updated more often, iDoor or USim OS?

iDoor ships an update monthly, and USim OS weekly. Most recently, iDoor was updated on September 16, 2026 and USim OS on September 16, 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.*