# PLC logic vs OTAC auth

The clearest difference is device support: OTAC auth at 3 against PLC logic's 1. PLC logic's advantage is iOS requirement (8.0 vs 15.0). On price, ads and in-app purchases 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 | PLC logic | OTAC auth |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 6 weeks |
| Size | 43 MB | 10 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Phoenix Contact GmbH & Co. KG](https://appshunter.io/developer/426916392) | [swIDch Limited](https://appshunter.io/developer/1723421198) |

## What reviewers say

### PLC logic

[App page](https://appshunter.io/ios/app/plc-logic/id1127456817)

**Features:** macOS Compatibility

**In-app purchases:** none


### OTAC auth

[App page](https://appshunter.io/ios/app/otac-auth/id6475137518)

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

**In-app purchases:** none


## Frequently asked questions

### Is PLC logic free?

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

### Is OTAC auth free?

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

### Do PLC logic or OTAC auth have ads?

Neither PLC logic nor OTAC auth shows ads.

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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.*