Bookmarkk - Reading Tracker turns reading sessions into a structured social challenge. The listing describes short quizzes after chapters, XP and coins for participation, weekly leaderboards, streaks, monthly recaps, reading-pattern insights, and a community where users can follow friends. It also describes a personal knowledge layer for revisiting ideas across books and a reward system where earned coins can be redeemed for physical books. The key access constraint is easy to miss: despite the free download, the developer says a Bookmarkk Book Club subscription is required to use the tracker, chapter quizzes, XP, streaks, and leaderboards. The US App Store lists three purchases all named Bookmarkk Book Club at $3.99, $9.99, and $69.99, but the public list does not show billing periods or explain differences. Check the in-app purchase screen for the active price and renewal interval before subscribing. Apple's developer-reported privacy label says identifiers, usage data, and diagnostics may be used for tracking; it also lists contact details, identifiers, usage, and diagnostics as linked to the user. Apple has not verified those disclosures. The app is listed in English and requires iOS 15.1 or iPadOS 15.1 or later. The listing is aimed at reading engagement and book tracking; rewards and community activity depend on the service's current programs.
