# Castel SIP vs SSL Quick Response

The clearest difference is update cadence: SSL Quick Response at every 3 weeks against Castel SIP's every 4 months. SSL Quick Response also leads on 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, SSL Quick Response every 3 weeks. The most recent releases landed on September 18, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Castel SIP | SSL Quick Response |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ssl-quick-response/id6627336023/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 84 MB | 28 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Castel](https://appshunter.io/developer/566301834) | [Software Shop Limited](https://appshunter.io/developer/536603585) |

## 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


### SSL Quick Response

[App page](https://appshunter.io/ios/app/ssl-quick-response/id6627336023)

This application enables communities to swiftly report and address incidents. Users can submit safety concerns or emergencies from their phones, with automatic verification and real-time notifications to all members. This facilitates coordinated responses, improving community safety and security.

**Highlights:** Submit incident reports, Automatic information verification, Real-time community notifications, Coordinated swift responses, Enhanced safety and security

**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 SSL Quick Response free?

SSL Quick Response is free to download, with no in-app purchases.

### Do Castel SIP or SSL Quick Response have ads?

Neither Castel SIP nor SSL Quick Response shows ads.

### Which is updated more often, Castel SIP or SSL Quick Response?

Castel SIP ships an update every 4 months, and SSL Quick Response every 3 weeks. Most recently, Castel SIP was updated on September 18, 2026 and SSL Quick Response on October 5, 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.*