# Castel SIP vs XBABBLE

The clearest difference is update cadence: Castel SIP at every 4 months against XBABBLE's every 22 months. Castel SIP also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.

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

Castel SIP ships an update every 4 months, XBABBLE every 22 months. The most recent releases landed on September 18, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Castel SIP | XBABBLE |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Every 4 months** | Every 22 months |
| Monetization | Free | — |
| Size | 84 MB | 73 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Castel](https://appshunter.io/developer/566301834) | [Xaccel Networks LLC](https://appshunter.io/developer/1600624137) |

## What reviewers say

### Castel SIP

[App page](https://appshunter.io/ios/app/castel-sip/id566301831)

This application functions as a SIP intercom softphone, enabling users to make and receive audio and video calls from IP intercom stations on their mobile devices. It allows for communication and remote door opening, working through Wi-Fi and cellular data networks.

**Highlights:** Audio and video calls, IP intercom station integration, Remote door opening, Address book with favorites, Call history, Remote commands during calls

**Features:** macOS Compatibility

**In-app purchases:** none


### XBABBLE

[App page](https://appshunter.io/ios/app/xbabble/id6449603711)

**In-app purchases:** none


## Frequently asked questions

### Is Castel SIP free?

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

### Is XBABBLE free?

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

### Which is updated more often, Castel SIP or XBABBLE?

Castel SIP ships an update every 4 months, and XBABBLE every 22 months. Most recently, Castel SIP was updated on September 18, 2026 and XBABBLE on October 16, 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.*