# Castel SIP vs IPTalker

The clearest difference is update cadence: Castel SIP at every 4 months against IPTalker's every 10 months. IPTalker's advantage is iOS requirement (6.0 vs 15.5). 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.

Castel SIP ships an update every 4 months, IPTalker every 10 months. The most recent releases landed on September 18, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Castel SIP | IPTalker |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 10 months |
| Monetization | Free | — |
| Size | 84 MB | 23 MB |
| Requires iOS | 15.5 | **6.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Castel](https://appshunter.io/developer/566301834) | [PortSIP Solutions, Inc.](https://appshunter.io/developer/426903821) |

## 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


### IPTalker

[App page](https://appshunter.io/ios/app/iptalker/id666238043)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Castel SIP free?

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

### Is IPTalker free?

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

### Do Castel SIP or IPTalker have ads?

Neither Castel SIP nor IPTalker shows ads.

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

Castel SIP ships an update every 4 months, and IPTalker every 10 months. Most recently, Castel SIP was updated on September 18, 2026 and IPTalker on October 7, 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.*