# Castel SIP vs CooCall

The clearest difference is review sentiment: Castel SIP at 60% against CooCall's 0%. CooCall's advantage is update cadence (fortnightly vs every 4 months) and iOS requirement (13.0 vs 15.5). 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.

Castel SIP ships an update every 4 months, CooCall fortnightly. The most recent releases landed on September 18, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Castel SIP | CooCall |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/coocall/id1018188405/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 84 MB | 10 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Castel](https://appshunter.io/developer/566301834) | [ZYCOO CO LTD](https://appshunter.io/developer/1018188404) |

## 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


### CooCall

[App page](https://appshunter.io/ios/app/coocall/id1018188405)

This app allows users to take their office phone extension with them anywhere. Make and receive calls using your office system from cafes, airports, or abroad. It synchronizes with your enterprise phonebook and offers personalized ringtones.

**Highlights:** Mobile office extension, Inbound and outbound calls, QR code registration, Enterprise phonebook sync, Personalized ringtones

**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 CooCall free?

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

### Do Castel SIP or CooCall have ads?

Neither Castel SIP nor CooCall shows ads.

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

Castel SIP ships an update every 4 months, and CooCall fortnightly. Most recently, Castel SIP was updated on September 18, 2026 and CooCall on October 19, 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.*