# Castel SIP vs Loop by Cuemill

The clearest difference is update cadence: Loop by Cuemill at monthly against Castel SIP's every 4 months. 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, Loop by Cuemill monthly. The most recent releases landed on September 18, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Castel SIP | Loop by Cuemill |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free | — |
| Size | 84 MB | 113 MB |
| Requires iOS | 15.5 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Castel](https://appshunter.io/developer/566301834) | [Cuemill Corporation](https://appshunter.io/developer/1679969121) |

## 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


### Loop by Cuemill

[App page](https://appshunter.io/ios/app/loop-by-cuemill/id6446999116)

**In-app purchases:** none


## Frequently asked questions

### Is Castel SIP free?

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

### Is Loop by Cuemill free?

Loop by Cuemill is free to download, with no in-app purchases.

### Do Castel SIP or Loop by Cuemill have ads?

Neither Castel SIP nor Loop by Cuemill shows ads.

### Which is updated more often, Castel SIP or Loop by Cuemill?

Castel SIP ships an update every 4 months, and Loop by Cuemill monthly. Most recently, Castel SIP was updated on September 18, 2026 and Loop by Cuemill on October 18, 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.*