# Linphone vs Castel SIP

The clearest difference is review sentiment: Castel SIP at 60% against Linphone's 35%. Linphone's advantage is update cadence (every 2 months vs every 4 months). 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.

Linphone ships an update every 2 months, Castel SIP every 4 months. The most recent releases landed on October 29, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Linphone | Castel SIP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (10 ratings)](https://appshunter.io/ios/app/linphone/id360065638/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 35.4% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 69 MB | 84 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Belledonne Communications SARL](https://appshunter.io/developer/694969034) | [Castel](https://appshunter.io/developer/566301834) |

## What reviewers say

### Linphone

[App page](https://appshunter.io/ios/app/linphone/id360065638)

This open-source application provides free audio and video calls, as well as text messaging, over the internet. It allows users to stay reachable at all times via WiFi or mobile data, even when the app is closed. Enjoy secure communication and the ability to connect with traditional phone lines.

**Highlights:** High definition audio and video calls, Audio conference calls, Picture and file sharing, Push notifications for reachability, Secure communication with encryption, SIP-compliant VoIP service integration

**Features:** Siri integration, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Good call quality
- 🚀 Works well with SIP providers
- 💡 Useful features like DTMF support

**What reviewers complain about**

- 🐛 Buggy, crashes frequently
- 🔑 Issues with account setup and configuration
- 🔒 Security concerns with password handling
- 🔋 Unreliable background/push notification support

**Reported bugs**

- Crashes on startup
- Incoming calls not working properly
- Settings not saving correctly
- Compatibility issues with newer iOS versions

**Requested features**

- Add support for multiple SIP accounts
- Improve user interface and navigation
- Provide more customization options
- Enhance audio quality and noise cancellation


### 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


## Frequently asked questions

### Is Linphone free?

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

### Is Castel SIP free?

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

### Do Linphone or Castel SIP have ads?

Neither Linphone nor Castel SIP shows ads.

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

Linphone ships an update every 2 months, and Castel SIP every 4 months. Most recently, Linphone was updated on October 29, 2026 and Castel SIP on September 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.*