App is a free extension for Mac. There is an optional subscription with premium features for $4.99/year, 2.99$/six month, 1.99$/three month, 0.99$/one month with a 14-day free trial. Premium features include the ability to customise the appearance of the extension, the ability to navigate through the current playlist, unlock track cover and fast mute button.
The subscription automatically renews unless turned off in AppStore.app → Account → Subscriptions at least 24 hours before current period ends. Your iTunes Account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed.