Episteme Reader is an offline-first, privacy-focused document and e-book reader that supports PDF, EPUB, MOBI, AZW3, Markdown, HTML, and plain text.

Features:

• Documents: View PDF, Markdown (MD), TXT, and HTML files.
• E-books: Read EPUB, MOBI, and AZW3 files using native parsing.
• PDF Modes: Vertical Scroll and Paginated views.
• Annotations: Draw directly on pages (ink, highlighter, eraser) or add text notes.
• Customization: Adjust font size, margins, and import custom fonts (.ttf, .otf).
• Organization: Built-in library management and Text-to-Speech (TTS) support.

This is a completely free and open-source (OSS) app built natively using Jetpack Compose.