Quire is a native Android EPUB reader for people who self-host calibre-web. It browses your library over OPDS, downloads books on demand, renders them with Readium, and syncs reading progress (and later bookmarks) to a small companion server you run yourself (Quire Server, included). Features: - OPDS catalog browsing and search - EPUB reading with Readium (font, theme, line-height controls) - Reading progress sync across devices via your own Postgres - Multi-user from day one - One credential: your existing calibre-web account Privacy: - No analytics, no crash reporting, no third-party SDKs - Network calls go to your calibre-web and your sync server only - Credentials stored in Android Keystore Source code, server, and documentation: https://github.com/vitofico/quire Optional AI features (off by default): when your Quire Server administrator configures an AI endpoint (such as a self-hosted Ollama or a third-party provider) and you opt in from Settings, Quire shows generated book insights — author, summary, series, themes, craft notes, comparative anchors, and book-club style discussion prompts — grounded with citations from Wikipedia and OpenLibrary. A separate Library Insights screen builds a personal reader profile from your finished books and suggests further reads (both from your own library and via OpenLibrary discovery). No AI request leaves your network until you explicitly opt in, and a single tap in Settings deletes the cached profile.