# protel Air vs correctTime

The clearest difference is update cadence: correctTime at monthly against protel Air's every 2 months. protel Air'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.

protel Air ships an update every 2 months, correctTime monthly. The most recent releases landed on June 5, 2026 and August 20, 2026 respectively.

## The numbers

| Metric | protel Air | correctTime |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 18 MB | 28 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [protel hotelsoftware GmbH](https://appshunter.io/developer/417393124) | [Webtheke GmbH](https://appshunter.io/developer/1704155487) |

## What reviewers say

### protel Air

[App page](https://appshunter.io/ios/app/protel-air/id455185874)

**In-app purchases:** none


### correctTime

[App page](https://appshunter.io/ios/app/correcttime/id6464391193)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is protel Air free?

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

### Is correctTime free?

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

### Do protel Air or correctTime have ads?

Neither protel Air nor correctTime shows ads.

### Which is updated more often, protel Air or correctTime?

protel Air ships an update every 2 months, and correctTime monthly. Most recently, protel Air was updated on June 5, 2026 and correctTime on August 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*