I’m stretching the definition of “app” here but Lemmy appears to be a progressive web app, so if you click “add to home screen” in iOS then the icon for Lemmy will open up a captive web browser that behaves like any other app.
It’s not as fast as an actual app, but it feels very similar to using one. Most apps are just react-native these days anyway.
I tried this but the experience isn’t great. Not sure if it’s a Lemmy issue or iOS but when I open a post, then go back, my homepage refreshes and sends me back to the top. It doesn’t seem to happen in safari but at least there, I can just open posts in a new tab.