This is pretty popular javascript to notify user. https://github.com/cubiq/add-to-homescreen https://github.com/cubiq/add-to-homescreen Also available in NPM

This is pretty popular javascript to notify user. https://github.com/cubiq/add-to-homescreen https://github.com/cubiq/add-to-homescreen Also available in NPM https://www.npmjs.com/package/add-to-homescreen https://www.npmjs.com/package/add-to-homescreen