RSVP Manager is a Progressive App, or the next generation of apps! You don’t need to download it from anywhere. Simply purchase the RSVP manager and enable the guest version of the App. When you share your website and a guest clicks on your unique URL, they are prompted with a message that asks them to add it to the homescreen. As soon as they do that, the icon is saved on their phone. It takes up practically zero storage on their device.