You may cancel automatic renewal and manage your subscription by selecting Manage App Subscriptions in your iTunes Account settings and selecting the subscription you want to modify.
Should you choose to upgrade to a Premium subscription, payment will be charged to your iTunes account at confirmation of purchase.
Any unused portion of a free trial period, if offered, will be forfeited when you purchase a Premium subscription, where applicable.
Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
TubeCut Premium offers two subscription options: monthly and yearly.