If you're using an iOS or Android device, you can add the web-app bookmark to your home screen and it operates just like an app.
To add Sharesies to your home screen, follow the steps below.
Open Safari and go to the login page.
Select the Share icon (the square with an arrow pointing up).
Select ‘Add to Home Screen’. The app will be added to your home screen!
Open your browser and go to the login page.
Select the Settings button (the three vertical dots).
Select the star symbol—you can edit the page name, and choose a folder to save it to.
Go back to the browser settings menu, and open the Bookmarks folder.
Select the Sharesies bookmark, and select 'Add to Home Screen' from the list of options.