# FolioReader/FolioReader-Android

A Java ePub reader and parser framework for Android.

Repository: https://github.com/FolioReader/FolioReader-Android
Canonical: https://ross.abutalabs.com/products/folioreader-android
Language: JavaScript
License: BSD-3-Clause
License Family: permissive
Topics: epub-reader, epub, java, night-mode, custom-fonts, android, highlight
Last push: 2023-10-10T13:26:47+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4166, "days_push": 1058, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2318, forks 729 (observed 2026-08-28T04:06:36.948748+00:00)

## What it is
FolioReader-Android is a Java and Kotlin EPUB reader and parser framework for Android apps. It provides an embeddable e-book reading view with highlighting, notes, themes, and customizable fonts.

## Use cases
- embed an epub reader in my android app
- parse epub files on android
- add text highlighting and notes to an e-book reader
- support day and night reading modes
- let users change fonts and text size in a reader
- open epub books from assets or raw resources
- build a reading app with last-read position tracking

## When to choose
- you need a ready-made, embeddable EPUB reading experience on Android
- you want highlighting, notes, and search out of the box
- you need epub parsing plus a reader UI rather than just parsing

## When to avoid
- you need PDF support or text-to-speech, which are unimplemented
- you need media overlays syncing text with audio
- you need a maintained project with frequent updates or iOS/other platforms
- you only need to extract epub metadata without a reader UI

## Facets
- artifact type: library
- maturity: maintenance
- function: parser, ui-components, theme
- domain: mobile-development, files, cross-platform
- platform: jvm
- tags: epub-reader, epub-parser, e-book, highlighting, night-mode, custom-fonts, reading-app, android

## Member repositories
- FolioReader/FolioReader-Android (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:36.948748+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:38:52.452554+00:00, confidence not recorded.
  - readme: https://github.com/FolioReader/FolioReader-Android (fetched 2026-08-28T04:06:36.948748+00:00, sha 591794672af7)
- Data as of 2026-08-30T08:39:29.467469+00:00.