I have found that performance across all devices and browsers is definitely not equal. By far the best browser I have found for viewing the apps is Google Chrome. I have also tended to find that my Ubuntu machines don’t do as well as Microsoft machines in picking up words correctly. A chat I had with someone recently suggested this might be down to drivers under Ubuntu for the microphones but that is not my area of expertise. Voice recognition was also fine on both of my Blackberry phones (one running BB OS 10, the other running Android 7).
It is worth noting that this does require an internet connection to function, in Chrome the voice to text is performed in the cloud.
The other thing I have noticed is that annyang seems relatively sensitive to background noise. This isn’t so bad for functions called using specific phrases but does sometimes have a large effect on the multi-word splats. This is because the splats are greedy and the background noise makes the recognition engine think that you are still talking long after you finished which gives the appearance of the application hanging.
The solution is by no means perfect, but it does look quite interesting.