A Starfall App Subscription is managed through the Apple App Store, and provides access to all activities on the Starfall App on your device. Subscriptions are offered for a small monthly fee, and renew automatically until cancelled. (Subscriptions must be cancelled at least 24 hours before the end of the current subscription period to avoid adding an additional month.) 

A Starfall Membership can be purchased directly from Starfall, and generally lasts for a full one-year period for a single, one-time payment. Memberships do not renew automatically and will expire on their own after the membership period ends.