My knowledge is really surface level as I'm not a developer. I'm just fascinated by stuff like this and seeing how far they can push it. It doesn't seem like web apps have taken off the way that native apps have, but part of that is people getting better and better internet over time and more powerful phones, so that things can run without the jank. It does work on both iOS and Android in modern browsers just by going to the URL. Wefwef really is quite stunning, especially if you take into account how new it is and how much they've done in so little time. Another good one is https://weather.com, which you can install the same way.