Mobile-first online casinos are designed to work smoothly right in your browser...

https://papa-wiki.win/index.php/How_Do_Casinos_Keep_the_Same_Settings_Across_Devices%3F

Mobile-first online casinos are designed to work smoothly right in your browser using HTML5, so there’s no need to download apps. They load faster and have touch-friendly layouts that make it easy to play on the go