# bimCAD + Luftverbund App vs Crown Centrex

bimCAD + Luftverbund App and Crown Centrex are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

bimCAD + Luftverbund App ships an update every 3 months, Crown Centrex every 6 months. The most recent releases landed on October 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | bimCAD + Luftverbund App | Crown Centrex |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | — | Free |
| Size | 157 MB | 32 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hottgenroth Software AG](https://appshunter.io/developer/985193745) | [Gamma Communications GmbH](https://appshunter.io/developer/1500711306) |

## What reviewers say

### bimCAD + Luftverbund App

[App page](https://appshunter.io/ios/app/bimcad-plus-luftverbund-app/id1339703759)

**Features:** macOS Compatibility

**In-app purchases:** none


### Crown Centrex

[App page](https://appshunter.io/ios/app/crown-centrex/id1611135719)

Transform your smartphone into a mobile extension of your virtual PBX. Make and receive calls worldwide using your landline number for cost-efficient and mobile communication. Access all the features of your Gamma Cloud PBX system directly from your device.

**Highlights:** Smartphone as mobile PBX extension, Worldwide calls with landline number, Cost-efficient mobile calling, Access to PBX features, Gamma Cloud PBX integration

**Features:** Siri integration, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is bimCAD + Luftverbund App free?

bimCAD + Luftverbund App is free to download, with no in-app purchases.

### Is Crown Centrex free?

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

### Do bimCAD + Luftverbund App or Crown Centrex have ads?

Neither bimCAD + Luftverbund App nor Crown Centrex shows ads.

### Which is updated more often, bimCAD + Luftverbund App or Crown Centrex?

bimCAD + Luftverbund App ships an update every 3 months, and Crown Centrex every 6 months. Most recently, bimCAD + Luftverbund App was updated on October 26, 2026 and Crown Centrex on October 6, 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.*