Blackboard Drawing

Blackboard Drawing is a photo processing app that converts your photos into a blackboard/whiteboard painting style
Support 4K image processing

There are two different Premium Membership
Subscriptions (1 week & 12 months):
- Weekly Premium - 1 week costs 0.99 USD
- Yearly Premium - 1 year costs 7.99 USD

Premium Subscription:
• Payment will be charged to iTunes Account at confirmation of purchase
• Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
• Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
• Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
• Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable.

Terms: https://www.jianshu.com/p/23097ab32d2f
Privacy: https://juejin.im/post/5bc05424f265da0aec227fa0