VoIPXS vs Zandkasteel
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
VoIPXS
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We have built the VoIPXS App so that you can use it straight away. What can you do with the VoIPXS App? * Call and receive calls with the call quality you're used to * Clients see a landline number if you ring when you are outside the office * See who is calling you and make a call from your own contacts * You don't need a desk phone, but the App combines well with it * Simply use your own voicemail from your cellphone provider
Zandkasteel
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Zandkasteel is your building in one app. What if you could have instant access to amenities, smart building features and community right in the palm of your hand? Zandkasteel is a tenant experience platform that transforms the way you live and work in buildings. Newsfeed β Elevator maintenance? New amenities? Charity drive happening on-site? Stay updated with news from your building and community. Smart building features β No more plastic cards. With the Zandkasteel app you can access your building with your phone, manage your guests' visits or check the capacity of the canteen. Services β Connect with your neighborhood to get exclusive deals and perks from local vendors and retailers. Community β Connecting with others in the building can be a hassle. With the Zandkasteel app, itβs a piece of cake. Zandkasteel is the ideal place to get to know each other and learn about local events. Bookings β No more competing for the conference room. With Zandkasteel, you can easily book shared amenities, such as meeting rooms, shared bicycles or parking spots.
Screenshots
Verdict
The clearest difference is update cadence: Zandkasteel at every 3 weeks against VoIPXS's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
VoIPXS ships an update every 7 months, Zandkasteel every 3 weeks. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.
| Parameter | VoIPXS | Zandkasteel |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months | Every 3 weeks β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15 β better | 16.6 |
| Further details β not scored | ||
| Size | 18 MB | 294 MB |
| Age rating | 4+ | 12+ |
| Developer | Speak Freely | Spaceflow Inc. |
In-app purchases
VoIPXS
No in-app purchases
Zandkasteel
No in-app purchases








