# Castel SIP vs Kaleio

The clearest difference is device support: Castel SIP at 3 against Kaleio's 1. On price, update cadence, ads and in-app purchases 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, Kaleio every 2 months. The most recent releases landed on September 18, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Castel SIP | Kaleio |
| --- | --- | --- |
| 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 | 101 MB |
| Requires iOS | **15.5** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Castel](https://appshunter.io/developer/566301834) | [Koesio Groupe](https://appshunter.io/developer/1137136108) |

## 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


### Kaleio

[App page](https://appshunter.io/ios/app/kaleio/id1550110188)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Castel SIP free?

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

### Is Kaleio free?

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

### Do Castel SIP or Kaleio have ads?

Neither Castel SIP nor Kaleio shows ads.

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

Castel SIP ships an update every 4 months, and Kaleio every 2 months. Most recently, Castel SIP was updated on September 18, 2026 and Kaleio 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.*