With shinyapps.io, you can limit the access to your application by enabling authentication. Only users who log-in with valid credentials will be able to view or use the app.
To enable authentication in the administrative UI, select the application to modify and click on the Users tab.
Here is a sample application with the default visibility settings:

Change the Application Visibility to Private and click on Save Settings. Changing the visibility of your application will require a restart of the application. The Owner of the account and other members of the account will automatically be included in the list of authorized users.

After the application is restarted you can add authorized users by entering their email addresses and clicking on Add User.

Each user will receive an email from shinyapps.io with an invite to view your application. If a user does not already have an authenticated account on shinyapps.io, they will be able to create one by authenticating through one of the following three methods:
Shinyapps.io will prompt each visitor to your app for a username and password if they have not been authenticated. Only users who log-in with valid credentials will be able to view or use the app.
If you currently use the pre-beta authentication scheme, please upgrade to the new system by January 28, 2015 as we will be deprecating support for the old authentication system during the beta. For instructions on how to upgrade, please read the guide here.
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