# Castel SIP vs STN Suite

The clearest difference is update cadence: STN Suite at every 2 months against Castel SIP's every 4 months. STN Suite also leads on iOS requirement (12.0 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, STN Suite every 2 months. The most recent releases landed on November 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Castel SIP | STN Suite |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 84 MB | 50 MB |
| Requires iOS | 15.5 | **12.0** |
| 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


### STN Suite

[App page](https://appshunter.io/ios/app/stn-suite/id1609915816)

**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 STN Suite free?

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

### Do Castel SIP or STN Suite have ads?

Neither Castel SIP nor STN Suite shows ads.

### Which is updated more often, Castel SIP or STN Suite?

Castel SIP ships an update every 4 months, and STN Suite every 2 months. Most recently, Castel SIP was updated on November 1, 2026 and STN Suite on October 14, 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.*