Chrome Apps were Google's idea of packaging websites as self-contained apps. They only worked within the Chrome web browser. Now, we have Progressive Web Apps,

Chrome Apps were Google's idea of packaging websites as self-contained apps. They only worked within the Chrome web browser. Now, we have Progressive Web Apps, and Google have decided to promote using open standards to achieve the same goal, rather than offering a Chrome-only solution. Google have even released a migration guide (in 2016, when this was first announced): https://developers.chrome.com/apps/migration https://developers.chrome.com/apps/migration