I have seen your post about the progressive web apps and would like to ask you to try our web: http://www.selio.com/
It would be great if you expressed your opinion about it and shared it with your readers!
Also I live you the link where you can find more technical information about the app
If you have any doubts I´ll be happy to answer your question!
Hope you'll have a nice day and I'm waiting for your response!