A modern, offline‑first, privacy‑focused document & e‑book reader for Android, built with Kotlin and Jetpack Compose.
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 | 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 | ✅ | ✅ | ✅ |
| 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) | ✅ | ✅ | ✅ |
| 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 | ✅ | 🔜 | ❌ |
-
Clone the repository:
git clone https://github.com/Aryan-Raj3112/episteme.git cd episteme -
Build:
- Open in Android Studio and run the
ossDebugorossOfflineDebugvariant, 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 in Android Studio and run the
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)
| Contributor | Contribution |
|---|---|
 CCerrer |
Testing & QA |
 ottozumkeller |
Translation (German) |
 TURBOKANTR |
Translation (Turkish) |
 eyadalkordy24 |
Translation (Arabic) |
 berebara |
Translation (Russian) |
 mh4ckt3mh4ckt1c4s |
Translation (French) |
Help translate Episteme Reader into your native language! Weblate is used to manage localization.
Licensed under the GNU Affero General Public License v3.0 (AGPL‑3.0). See the LICENSE file.
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!
