The Zoiper webphone is using just an npapi browser plugin which has a lot of limitations:
- it is entirely based on two outdated technology (npapi and activeX)
- poor browser support:
- doesn't work in Android, iOS, MAC OSX, Linux (Windows only)
- doesn’t work with latest Chrome anymore (Chrome already removed the support for npapi and never supported ActiveX)
- never worked in Edge
The Mizutech webphone is based on modern HTML5 technologies and has multiple built-in engines which offer a wider coverage (all browsers, all OS, even mobile browsers support: windows, linux, mac, ios, android, Chrome, IE, edge, firefox, safari, opera and others )
The webphone is flexible and customizable: shipped with ready to use html/css which can be freely customized/modified without the need to reinvent the wheel.
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You might find other solutions marketed as "Cross platform" but they are mostly use one single engine and are far to be cross platform. Even if on platform X the performance is not optimal, they might not take full advantage of the platform capabilities as the webphone does by using the best available engine.