Hourly releases new app versions on a regular basis. In order to use Hourly to the fullest, you should make sure that all your employees have the latest app version installed on their phones.
To see a list of your employees that still need to update their app, please go to the navigation menu, click on "Employees" and then in your list of employees, you will see a notation "Outdated App Version" for every employee that didn't yet install the latest app.