# MONITORING & TIMER RELAY vs ProAir

The clearest difference is iOS requirement: ProAir at 10.0 against MONITORING & TIMER RELAY's 12.0. 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.

## The numbers

| Metric | MONITORING & TIMER RELAY | ProAir |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Size | 195 MB | 30 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phoenix Contact GmbH & Co. KG](https://appshunter.io/developer/426916392) | [Globus Sistemas Eletronicos Ltda](https://appshunter.io/developer/1211409010) |

## What reviewers say

### MONITORING & TIMER RELAY

[App page](https://appshunter.io/ios/app/monitoring-and-timer-relay/id1505993143)

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

**In-app purchases:** none


### ProAir

[App page](https://appshunter.io/ios/app/proair/id1565591214)

**In-app purchases:** none


## Frequently asked questions

### Is MONITORING & TIMER RELAY free?

MONITORING & TIMER RELAY is free to download, with no in-app purchases.

### Is ProAir free?

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

### Do MONITORING & TIMER RELAY or ProAir have ads?

Neither MONITORING & TIMER RELAY nor ProAir 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.*