Design an app to allow book subscriptions with hard copies.

To design a book subscription app for hard copies, we need to define the core value proposition, target audience, and key features. The primary goal is to encourage reading through a convenient subscription model. We should consider different subscription tiers (e.g., monthly, quarterly) and book genres to cater to diverse reading preferences across age groups and professions. Key features would include personalized recommendations, a curated selection of books, easy subscription management, and reliable delivery. User acquisition strategies could involve partnerships with publishers, social media marketing, and referral programs.