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Material You 3 eBook/audiobook reader — Episteme fork + bookshelf-api/ABS
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Aryan 6ea414c9b2
Expanded folder sync functionality to support multiple folders and improved performance. (#47) 
- Added `SyncedFolder` data class and transitioned from a single `syncedFolderUri` to a list of `syncedFolders`.
- Implemented logic to add, remove, and persist multiple synced folders using JSON in shared preferences, including a migration path for legacy single-folder settings.
- Updated `FolderSyncWorker` to iterate through all registered folders and added an annotation sidecar preloading optimization to reduce file I/O during sync.
- Redesigned the "Folder Sync" UI in `LibraryScreen` to display a list of active folders with individual management options and a 3-folder limit.
- Refined permission handling to request both read and write access for synced folders.
2026-03-08 17:56:09 +05:30
.github Update GitHub sponsor button with a username (#8) 2026-02-26 18:44:11 +05:30
app Expanded folder sync functionality to support multiple folders and improved performance. (#47) 2026-03-08 17:56:09 +05:30
docs docs: Revamp README and add APK naming convention (#2) 2026-02-25 19:54:43 +05:30
fastlane/metadata/android/en-US use HTML for fastlane full description (#15) 2026-02-27 21:59:10 +05:30
gradle Initial commit 2026-02-24 17:37:40 +05:30
spotless Update readme (#3) 2026-02-25 21:30:28 +05:30
.gitattributes Initial commit 2026-02-24 17:37:40 +05:30
.gitignore docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
build.gradle.kts docs: Revamp README and add APK naming convention (#2) 2026-02-25 19:54:43 +05:30
CLA.md docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
CONTRIBUTING.md Added stylus-only mode for PDF drawing and annotations. (#27) 2026-03-04 13:18:26 +05:30
gradle.properties Initial commit 2026-02-24 17:37:40 +05:30
gradlew Initial commit 2026-02-24 17:37:40 +05:30
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LICENSE docs: add README, LICENSE, and configure automated license headers 2026-02-25 16:54:51 +05:30
README.md Fix icon and name alignment in readme (#4) 2026-02-25 21:34:06 +05:30
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README.md

Episteme Reader Icon  Episteme Reader

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

Get it on Google Play

Episteme Reader Preview

Overview

Episteme Reader is an offline-first application designed for reading various document formats. It leverages native Android technologies and C++ libraries to provide a performant reading experience with customization capabilities.

Note: This is the Open Source (OSS) edition of Episteme Reader. The version available on the Google Play Store is built from this core but includes additional proprietary features.

Features

Supported Formats

  • Documents: PDF
  • E-books: EPUB, MOBI, AZW3
  • Text: MD, TXT, HTML

PDF Features

  • Viewing Modes: Vertical Scroll and Paginated view.
  • Ink Annotations: Draw directly on pages using Pen, Highlighter, and Eraser tools.
  • Text Annotations: Add text notes anywhere on the page using system or custom fonts.

E-Book Features

  • Parsing: Native parsing for MOBI/AZW3 via libmobi and EPUB via Jsoup.
  • Customization: Adjust font size, line spacing, and margins.
  • Custom Fonts: Support for importing user-provided font files (.ttf, .otf).

General

  • Text-to-Speech (TTS): Read documents aloud using the system TTS engine.
  • File Management: Built-in library organization.

Architecture

  • UI: 100% Jetpack Compose (Material3).
  • Architecture: MVVM with Unidirectional Data Flow.
  • Database: Room (SQLite) for metadata and annotations.
  • PDF Engine: pdfium-android (Native PDFium bindings).
  • EPUB Engine: Utilizes standard WebView for vertical scrolling mode, and a custom rendering engine for paginated mode.
  • Mobi Engine: Custom JNI bindings to libmobi.

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 variant.

    ./gradlew assembleOssDebug

Open Source Libraries

This project is made possible by the Android open-source ecosystem:

  • Core & UI: AndroidX, Jetpack Compose, Kotlinx Serialization
  • Document Engines: PdfiumAndroidKt (PDF), libmobi (MOBI/AZW3), Google WOFF2 (Fonts)
  • Parsers: Jsoup (HTML/EPUB), Flexmark (Markdown)
  • Media & Image Loading: Coil, Media3 (ExoPlayer)
  • Utilities: Room (Database), Timber (Logging)

License

This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0). See the LICENSE file for details.