JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-controller="Ctrl1">
    <div> Ctrl1 Status is: {{status}}
    </div>
    <div>
        <input type="text" ng-model="status" />
    </div>
<div ng-controller="Ctrl2">Ctrl2 Status is: {{status}}
    <div>
        <input type="text" ng-model="status" />
    </div>
</div>

JavaScript

angular.module('myApp', [])
    .controller('Ctrl1', function ($scope, App) {
        $scope.status = App.data.status;
        $scope.$watch('App.data.status', function() {
            $scope.status = App.data.status;
        });
})
    .controller('Ctrl2', function ($scope, App) {
        $scope.status = App.data.status;
        $scope.$watch('status', function() {
            App.data.status = $scope.status;
        });
})
    .service('App', function () {
        this.data = {};
        this.data.status = 'Good';
});