Castel SIP vs 1
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Castel SIP
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.
- Audio and video calls
- IP intercom station integration
- Remote door opening
- Address book with favorites
- Call history
- Remote commands during calls
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Castel SIP App is a SIP intercom softphone. The easy-to-use and intuitive application, allows you to make and receive audio and video calls from IP intercom stations (XELLIP, CAPIP...) on your iPhone or iPad. With Castel SIP App, you can communicate and open the door, anywhere. It works with the Castel Cloud SIP server through Wi-Fi and 3G/4G/5G. Main features: - Audio and video calls with advanced functionalities (Loudspeaker, transfer calls, hold...) - Address book with favorites - Call history - Remote commands during calls and DTMF - Support landscape and portrait mode for all smartphone and tablet designs (camera notch...) Note: Please, check your cellular operator's terms of agreement to make sure they allow SIP calls on their network before using Castel SIP App.
1
Make affordable international calls using your mobile device over Wi-Fi or 3G. Receive VoIP calls anywhere with push notifications or background mode support. This service is designed for iPhone, iPad, and iPod Touch.
- Affordable international calls
- Wi-Fi and 3G calling
- Receive VoIP calls
- Push notifications for incoming calls
- iOS background mode support
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1-Talk voice service is the leading SIP termination service for iPhone, iPad and iPod Touch. Set it up and start making cheap calls over WiFi or 3G from your mobile device. You can also receive VoIP incoming calls anywhere using out Push Notifications service or iOS background mode. © 2010-2014 Webcorp Solutions L.P. http://1-talk.com
Screenshots
Verdict
The clearest difference is iOS requirement: 1 at 6.0 against Castel SIP's 15.5. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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, 1 every 5 months. The most recent releases landed on September 18, 2026 and October 14, 2026 respectively.
| Parameter | Castel SIP | 1 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.5 | 6.0 — better |
| Further details — not scored | ||
| Size | 84 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Castel | PortSIP Solutions, Inc. |
Customer experience
Castel SIP
1
In-app purchases
Castel SIP
No in-app purchases
1
No in-app purchases
