I put together a relatively simple “Progressive Web App” called SimplyWeather.  It uses a weather feed to create a simple forecast for your current location.  A Progressive Web App is supposed to act like a natively installed app, but written using web technologies.  If you load the above link on your phone, it should ask you to install to your home screen, at which point you can run it from there (it’ll look like a local app).

Overall, building a PWA is a bit of a PITA, with some very finicky and temperamental requirements.  I found the “service worker” and “manifest” particularly feisty.  Also, I’m not sure how to send updates consistently – the app seems to cache most everything, and not refresh styles or html even when you try to force that.

So, I think PWA’s still have a way to go, in terms of online documentation and examples.  Then it still remains to be seen if people prefer to just stay inside the app stores as they have been.