Yearly subscriptions give you access to all premium features for a year from the date of purchase (referred to as "current period").
Yearly subscriptions will automatically renew unless canceled within 24-hours before the end of the current period, and your iTunes account will be charged for renewal within 24-hours prior to the end of the current period.
Features of Fastient include the ability to track your daily achievements and journal symptoms, mood, weight, and more.
Fastient Premium is offered in two ways, Lifetime and Yearly.
You can manage your subscriptions or turn off auto-renewal anytime in your iTunes account settings.