The app is $1.99 (in US) to download, however, there will be a auto-renewable subscriptions.
Option . $5.99 (in US)for a yearly subscription.
Payment will be charged to iTunes account at confirmation of purchase. The subscription, either weekly or yearly, automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. The account will be charged for renewal within 24 hours prior to the end of the current period, and identify the cost of renewal. Auto-renewal may be turned off by going to account settings after purchase.