Additionally, not all in app browsers are custom things. Good apps use the system-provided SFSafariViewController on iOS and Custom Chrome Tabs on Android which

Additionally, not all in app browsers are custom things. Good apps use the system-provided SFSafariViewController on iOS and Custom Chrome Tabs on Android which are “real” instances of Safari and Chrome respectively and don’t allow app devs to snoop on browsing activity in the same way custom in-app browsers built with webviews do (though SFSafariViewController is better in this respect, since sessions are isolated per-app which bars cookie-based tracking whereas Custom Chrome Tabs seem to share the same browser’s session. Google also surfaces some light “engagement”APIs in theirs).