# Flow Smart v2 vs USim OS

The clearest difference is update cadence: USim OS at weekly against Flow Smart v2's monthly. Flow Smart v2's advantage is iOS requirement (11.0 vs 13.0). 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.

Flow Smart v2 ships an update monthly, USim OS weekly. The most recent releases landed on September 29, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Flow Smart v2 | USim OS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 40 MB | 77 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kwang Teck Lim](https://appshunter.io/developer/1592230756) | [Ruiyu Chen](https://appshunter.io/developer/1762343435) |

## What reviewers say

### Flow Smart v2

[App page](https://appshunter.io/ios/app/flow-smart-v2/id1592230754)

**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 Flow Smart v2 free?

Flow Smart v2 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 Flow Smart v2 or USim OS have ads?

Neither Flow Smart v2 nor USim OS shows ads.

### Which is updated more often, Flow Smart v2 or USim OS?

Flow Smart v2 ships an update monthly, and USim OS weekly. Most recently, Flow Smart v2 was updated on September 29, 2026 and USim OS on October 3, 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.*