ALL THE CONTENT IS THERE, EVERYONE

The 1-star reviews say that this app only has a list of linguistic definitions. However, those lists are only how the sounds are organized. To get to a sounds page (like you see in the screenshots), just tap on the definition (i.e. "Fricative" or "monopthong") and then you can select a specific sound from the bottom of the screen. This takes you to that sounds page with its description and videos, etc. So all the content is available like it is on the website! Its just that the apps design was a little confusing.

Doctrdoctr about Sounds of Speech