Why hasn't anyone developed an open-source Android app?

[Moin]

Is it possible to convert a forum into a real app?

The easiest thing you can try is deploying a TWA based on a PWA for Android. It’s really simple; it’s essentially publishing a PWA on the Play Store with official tools. It’s a more involved process for iOS, especially because of the review process, but you can also use something like PWABuilder or a similar tool to help publish your web app there. Both are just web views which will work almost the same as an installed PWA.

I think that was also discussed here a few years ago Discourse sites in Playstore