# USM lock C vs BURG App

The clearest difference is update cadence: BURG App at every 4 weeks against USM lock C's every 3 months. USM lock C's advantage is iOS requirement (15.6 vs 17.6). 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.

USM lock C ships an update every 3 months, BURG App every 4 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | USM lock C | BURG App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Size | 47 MB | 59 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [USM U. Schaerer Soehne AG](https://appshunter.io/developer/395765701) | [BURG Lueling GmbH & Co. KG](https://appshunter.io/developer/1603216412) |

## What reviewers say

### USM lock C

[App page](https://appshunter.io/ios/app/usm-lock-c/id6467190717)

**Features:** macOS Compatibility

**In-app purchases:** none


### BURG App

[App page](https://appshunter.io/ios/app/burg-app/id6753740960)

**In-app purchases:** none


## Frequently asked questions

### Is USM lock C free?

USM lock C is free to download, with no in-app purchases.

### Is BURG App free?

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

### Do USM lock C or BURG App have ads?

Neither USM lock C nor BURG App shows ads.

### Which is updated more often, USM lock C or BURG App?

USM lock C ships an update every 3 months, and BURG App every 4 weeks. Most recently, USM lock C was updated on October 30, 2026 and BURG App on October 30, 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.*