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Material You 3 eBook/audiobook reader — Episteme fork + bookshelf-api/ABS
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Aryan 26692d2c05
General improvements (#151) 
* Updated folder synchronization logic and redesigned the file type filter dialog.

* Fixed CFI generation and navigation stability in the EPUB reader.

* Improved CFI scrolling and position calculation in the EPUB reader by implementing text node traversal using `TreeWalker`. This ensures accurate positioning and scrolling when a CFI offset spans multiple fragmented text nodes.

* fix fb2 multiline titles, retain footnotes, and prevent stream leaks

- Fix FB2 titles with multiple paragraphs by inserting breaks/spaces
- Prevent resource leaks by properly closing InputStreams in all importers
- Retain "notes" and "comments" sections in FB2 instead of skipping them
- Add support for FB2 poem, stanza, cite, and link tags

* Implement persistence for zoom and pan states when pan lock is enabled in the PDF reader.

* Added `FileTypeBadge` to home and library screens

* Bump version to 1.0.41(42)
2026-04-05 10:36:44 +05:30
.github ci: Add CLA Assistant workflow (#61) 2026-03-12 22:05:44 +05:30
app General improvements (#151) 2026-04-05 10:36:44 +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 update description, phone images and feature graphic in fastlane (#67) 2026-03-14 14:16:36 +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
.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 cla (#62) 2026-03-12 22:31:52 +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
gradlew.bat Initial commit 2026-02-24 17:37:40 +05:30
LICENSE Pdf text highlight (#49) 2026-03-09 17:37:44 +05:30
README.md docs: add Contributors section to README (#85) 2026-03-17 14:04:07 +05:30
settings.gradle.kts build: remove foojay-resolver-convention plugin for f-droid compliance (#12) 2026-02-27 15:08:39 +05:30

README.md

Episteme Reader Icon  Episteme Reader

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

Get it on F-DroidGet it on Google Play


Episteme Reader Preview

Overview

Episteme Reader is an offline-first, privacy-focused document and e-book reader that supports PDF, EPUB, MOBI, AZW3, Markdown, HTML, and plain text.

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, 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

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)

Contributors

License

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

Support

If you find Episteme Reader useful and want to support its development, please consider sponsoring. Thank you!

Sponsor on GitHub