# USM lock C vs DigSig Authenticator

The clearest difference is device support: USM lock C at 2 against DigSig Authenticator's —. On price, in-app purchases and iOS requirement there is nothing between them.

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

## The numbers

| Metric | USM lock C | DigSig Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 3 months | — |
| Size | 47 MB | 56 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [USM U. Schaerer Soehne AG](https://appshunter.io/developer/395765701) | [Sieveo GmbH](https://appshunter.io/developer/1709852825) |

## What reviewers say

### USM lock C

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

**Features:** macOS Compatibility

**In-app purchases:** none


### DigSig Authenticator

[App page](https://appshunter.io/ios/app/digsig-authenticator/id6468394792)

**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 DigSig Authenticator free?

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

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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.*