The app allows users to stream music files they've purchased from Amazon or uploaded to Amazon's cloud-based storage service. Up to 5 GB of MP3 (.mp3) and AAC (.m4a) files can be uploaded to the cloud and streamed wirelessly using one of Amazon's players for free. Users can get unlimited music storage if they purchase one of Amazon's cloud storage packages starting at $20 per year for 20 GB.
Although it was posited as a universally accessible music service, users have only been able to play and manage their music from Internet-connected desktops, through native apps for Android devices and via the browsers of non-Android tablets.
An unofficial Cloud Player app appeared in the App Store in November, but was quickly pulled at the request of Amazon.