Episteme Reader is a sleek, offline-first and privacy-focused document and e-book reader designed for deep focus across multiple devices.

The main features of this application include:

• Local-First Architecture: It keeps your reading library on your device, allowing you to import files, sync local folders, and organize content into shelves and tags without relying on external servers.

• Extensive Format Support: It handles a wide variety of files, including Documents (PDF, DOCX, ODT), E-books (EPUB, MOBI, AZW3, MD, etc.), Comics (CBZ, CBR, CB7), and View-only files like JSON, CSV, and code.

• Customizable Reading Experience: Users can switch between paginated reading (classic page turns) and vertical scroll (continuous flow). It also features PDF reflow, multiple PDF tabs for study, and specialized modes like musician mode and auto-scroll.

• Deep Annotation Tools: The reader includes ink tools (pen, highlighter, eraser) for marking up PDFs directly, along with the ability to save highlights and attach notes or comments to specific sentences or pages.

• High Degrees of Customization: It offers extensive theming options (Light, Dark, Sepia, OLED, Slate) and precise typography controls, including the use of local fonts and adjustment of spacing and margins.

• Optional AI and Cloud Integration: While core reading is local, users can opt for Standard editions with server-backed AI summarization and recap tools, or an OSS edition that supports "bring-your-own-key" for AI providers.

• Privacy-Centric Editions: It is available in several versions, including an OSS Offline edition where all network permissions are removed to ensure absolute privacy.

• Multi-Platform Availability: Episteme is open-source and available for Android (Play Store and F-Droid), Windows, and various Linux distributions (.deb, .rpm, .pkg.tar.zst).