# FP Sign mobile vs Crown Centrex

The clearest difference is review sentiment: FP Sign mobile at 14% against Crown Centrex's 0%. FP Sign mobile also leads on update cadence (every 3 months vs every 6 months) and iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

FP Sign mobile ships an update every 3 months, Crown Centrex every 6 months. The most recent releases landed on October 15, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | FP Sign mobile | Crown Centrex |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **14.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | Free | Free |
| Size | 106 MB | 32 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FP InovoLabs GmbH](https://appshunter.io/developer/1376538859) | [Gamma Communications GmbH](https://appshunter.io/developer/1500711306) |

## What reviewers say

### FP Sign mobile

[App page](https://appshunter.io/ios/app/fp-sign-mobile/id1376538860)

Digitally sign and exchange documents from any location with this secure and scalable solution. Streamline your document processes for contracts, offers, and certificates, ensuring fast and reliable execution with business partners.

**Highlights:** Digital document signing, Document exchange, Scalable packages, High integration capability, eIDAS compliant, Long-term archiving

**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 FP Sign mobile free?

FP Sign mobile 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 FP Sign mobile or Crown Centrex have ads?

Neither FP Sign mobile nor Crown Centrex shows ads.

### Which is updated more often, FP Sign mobile or Crown Centrex?

FP Sign mobile ships an update every 3 months, and Crown Centrex every 6 months. Most recently, FP Sign mobile was updated on October 15, 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.*