Build a local-first ebook library that imports DRM^?-free EPUB^?, PDF^?, and comic files from explicitly selected folders, preserves user-defined categories, and synchronizes files and reading state across devices. Start with an Android reader and a desktop companion that provide deterministic folder inclusion rules, offline storage, exportable metadata, and conflict-safe progress synchronization. Do not promise migration of protected Kindle purchases; support user-owned files and authorized exports.

Readers increasingly use several devices while incumbent reading applications bind library management and synchronization to closed ecosystems. Repeated complaints about basic reliability create an opening for a narrowly scoped, portable library product whose data can be inspected, backed up, and exported.