Episteme Reader

A modern, offline‑first, privacy‑focused document & e‑book reader for Android, built with Kotlin and Jetpack Compose.

    

Overview

Episteme Reader is a comprehensive, customizable reader for documents and e-books on Android. It features a modern Jetpack Compose UI, powerful reading tools, and extensive theming.

To best serve different user preferences regarding privacy and network usage, Episteme Reader is available in three distinct editions:

• PlayStore Version: The full-featured release which includes proprietary code and features.
• OSS Version (GitHub/F-Droid): A fully open-source build.
• OSS Offline Version (GitHub): A strictly offline build with network permissions completely removed.

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Feature Comparison

📚 Supported Formats

Feature	PlayStore	OSS	OSS Offline
Documents: PDF, DOCX, ODT/FODT	✅	✅	✅
E-books & Text: EPUB, MOBI, AZW3, FB2, MD, HTML, TXT	✅	✅	✅
Comics: CBZ, CBR, CB7	✅	✅	✅
View-Only: CSV, TSV, JSON, XML, Logs, Code Files	✅	✅	✅

📖 Core Reading Experience

Feature	PlayStore	OSS	OSS Offline
Display Modes: Paginated & Vertical Scroll	✅	✅	✅
PDF Multi-Tab Reading & Reflow	✅	✅	✅
PDF Annotations: Ink (Pen, Highlight, Erase) & Text	✅	✅	✅
App-wide Customization & Reader Theming	✅	✅	✅
Custom Fonts: Local Import (TTF and OTF)	✅	✅	✅
Typography Control	✅	✅	✅
Auto-Scroll & Musician Mode	✅	✅	✅
System Text-to-Speech (TTS)	✅	✅	✅

⚙️ Advanced & Network Features

Feature	PlayStore	OSS (F-Droid)	OSS Offline
Local Folder Sync & Library Management	✅	✅	✅
Download Google Fonts	✅	✅	❌
OPDS Catalog Support	✅	✅	❌
PDF Bubble Zoom Magnifier	✅	❌	❌
ML Kit OCR (Scanned PDF Text Selection)	✅	❌	❌
Cross-Device Cloud Sync	✅	❌	❌
AI Tools (Summaries, Story Recap, Dictionary)	✅	🔜	❌
Cloud Text-to-Speech	✅	🔜	❌

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Building from Source

1. Clone the repository:

   git clone https://github.com/Aryan-Raj3112/episteme.git
   cd episteme
   

2. Build:

   • Open in Android Studio and run the ossDebug or ossOfflineDebug variant, or
   • Build from the command line:

     ./gradlew assembleOssDebug
     

   The APK will be generated at: app/build/outputs/apk/oss/debug/Episteme-oss-v{version}-oss-debug.apk

Open Source Libraries

Powered by the Android OSS ecosystem:

• Core & UI: AndroidX, Jetpack Compose, Kotlinx Serialization
• Document Engines: PdfiumAndroidKt (PDF), libmobi (MOBI/AZW3)
• Parsers: Jsoup (HTML/EPUB), Flexmark (Markdown)
• Media & Image Loading: Coil, Media3 (ExoPlayer)
• Utilities: Room (Database), Timber (Logging)

Contributors

Contributor	Contribution
CCerrer	Testing & QA
ottozumkeller	Translation (German)
TURBOKANTR	Translation (Turkish)
eyadalkordy24	Translation (Arabic)
berebara	Translation (Russian)
mh4ckt3mh4ckt1c4s	Translation (French)

Translations

Help translate Episteme Reader into your native language! Weblate is used to manage localization.

License

Licensed under the GNU Affero General Public License v3.0 (AGPL‑3.0). See the LICENSE file.

Support the Project

Help make Episteme Reader even better:

• ❤️ Support on Patreon
• ⭐ Star the repository to help visibility
• 🐞 Report bugs or request features via GitHub Issues
• 💬 Share feedback in Discussions
• ✍️ Leave a review on the Google Play Store
• 📣 Tell a friend!