/Shell/Bash/Is it possible to check with my website if an app is installed?

Is it possible to check with my website if an app is installed?

var now = new Date().valueOf();
setTimeout(function () {
    if (new Date().valueOf() - now > 100) return;
    window.location = "https://itunes.apple.com/appdir";
}, 25);
window.location = "appname://";

Source: stackoverflow.com

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