# SIG vs USC

The clearest difference is update cadence: USC at every 5 months against SIG's every 38 months. SIG's advantage is iOS requirement (11.0 vs 15.0). 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.

SIG ships an update every 38 months, USC every 5 months. The most recent releases landed on September 10, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | SIG | USC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 5 months** |
| Size | 14 MB | 50 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [WELDER V.O.F.](https://appshunter.io/developer/1482310066) | [Zooma B.V.](https://appshunter.io/developer/418861795) |

## What reviewers say

### SIG

[App page](https://appshunter.io/ios/app/sig/id1501243024)

**Features:** macOS Compatibility

**In-app purchases:** none


### USC

[App page](https://appshunter.io/ios/app/usc/id6477288382)

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

**In-app purchases:** none


## Frequently asked questions

### Is SIG free?

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

### Is USC free?

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

### Do SIG or USC have ads?

Neither SIG nor USC shows ads.

### Which is updated more often, SIG or USC?

SIG ships an update every 38 months, and USC every 5 months. Most recently, SIG was updated on September 10, 2026 and USC on September 13, 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.*