Safari 26 helps many websites feel more like apps when you use them on iPhone...

https://alpha-wiki.win/index.php/Safari_26_Web_App_vs_Regular_Bookmark:_What_Is_the_Difference%3F

Safari 26 helps many websites feel more like apps when you use them on iPhone and iPad. When you add a site to your Home Screen, it can launch without the browser chrome, giving you a cleaner, app-like experience