Full list with browsers which currently has implemented Speech Recognition API can be found here.
A common question we receive is about comptability with iOS. Unfortunately, Chrome on iOS does not support the Speech Recognition APIs toolset. Following Apple's requirements for browsers released through the App Store, the iOS version of Chrome uses the iOS WebKit – which is Apple's own mobile rendering engine, developed for Safari. That means that Chrome on an iPhone, iPad, or iPod Touch is more Safari than Chrome. But Voxpow is not causing any errors in this direction, just will fail quietly and not show the voice widget.