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Material You 3 eBook/audiobook reader — Episteme fork + bookshelf-api/ABS
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Feature/highlighter snap (#48) 
* perf: fix Home and Library screen stutter by removing main thread file checks

* feat(pdf): implement straight-line highlighter snap

- Added "Straight Line" toggle to highlighter settings popup with persistent state.
- Implemented "rubber-band" drawing effect for highlighters with cardinal direction snapping (0°, 90°, 180°, 270°).
- Optimized gesture loops in Vertical and Paginated readers to respond instantly to setting toggles.
- Rewrote eraser hit detection using point-to-line segment distance math for pixel-perfect erasure of straight lines.
2026-03-08 20:19:59 +05:30
.github Update GitHub sponsor button with a username (#8) 2026-02-26 18:44:11 +05:30
app Feature/highlighter snap (#48) 2026-03-08 20:19:59 +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
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.gitignore docs: add CLA and CONTRIBUTING guidelines (#26) 2026-03-04 10:19:17 +05:30
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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
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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.