Episteme is an open source, multi-platform document and e-book reader app.

It's offline-first, ad-free, and respects your privacy.

Supported Formats:

• Documents: PDF, DOCX, ODT/FODT
• E-books: EPUB, MOBI, AZW3, FB2
• Comics: CBR, CBZ, CB7
• Plain Text: MD, TXT, HTML

Key Features:

• PDF Annotations: You can draw directly on pages using a pen or highlighter and add text notes using system or custom fonts.
• Reading Modes: Supports both vertical scrolling and paginated views.
• E-book Customization: Adjust font sizes and margins. You can also import your own font files.
• Text-to-Speech (TTS): Includes a built-in TTS feature using Android's native TTS engine or cloud TTS.
• Library Management: A built-in system to organize your local files.
• Local Folder Sync: Select a folder to see all its supported file in app and sync reading positions and annotations using local sync tools like SyncThing.
• Themes: You can change the page and text color across all formats.
• Full OPDS Support: Browse, download, and manage books from OPDS catalogs.

The app is licensed under AGPL-3.0.

GitHub | Website | Playstore

Thanks for checking it out!