Aly & AJ have resently released their own official app for mobile devices. They will be publishing videos and photos from tours, studio, and more, personal blogs, information about tickets for shows, and something like that. There will be some free content, but you can also join The Sanctuary club for $60 per year and get some exclusive information that would not be available for others.

iOS (11.0 and later): https://apps.apple.com/us/app/aly-aj/id6443941374
Android (5.0 and later): https://play.google.com/store/apps/details?id=com.alyandaj.alyandaj