It seems to be nothing more than https://web.whatsapp.com/ in a web view. So I can't really see interest.
Some ways in which the official app is better: * The official app extends to the edges of the window, whereas the web app has a "window on a background" design, which takes up more space. * The official app has keyboard shortcuts. * The official app has better notifications.
A couple weeks ago. One thing it does better than the official app is that on Mac the red window button hides the window rather than terminating the process.