episteme

Introduction: A native Android document reader application built with Kotlin and Jetpack Compose.

Tags:

Episteme Reader

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

Episteme Reader Preview

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.

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	✅	🔜	❌

Building from Source

Clone the repository:

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

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

Open Source Libraries

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)