# koreader/koreader

An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices

Repository: https://github.com/koreader/koreader
Canonical: https://ross.abutalabs.com/products/koreader
Homepage: http://koreader.rocks/
Language: Lua
License: AGPL-3.0
License Family: copyleft
Topics: luajit, kobo, kindle, eink, ereader, ebook, pdf-reflow, pdf, djvu, epub, reflow, cbz, fb2, opds, ebook-reader, djvu-reflow, reader, ubuntu-touch, pocketbook, remarkable-tablet
Last push: 2026-08-26T23:22:22+00:00

## Health v2 (maintenance only)
Score: 89/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 71, longevity 100
- inputs: {"age_days": 4910, "days_push": 7, "days_rel": 32, "gap_med": 130.0, "n_releases_24m": 7}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 29289, forks 1887 (observed 2026-08-28T04:11:53.242918+00:00)

## What it is
KOReader is an open-source document viewer application primarily aimed at e-ink e-readers, supporting formats like PDF, DjVu, EPUB, FB2, Mobi, CBZ and more. It runs on Kindle, Kobo, PocketBook, Cervantes, reMarkable, Android, and desktop Linux/macOS, with a highly customizable, plugin-extensible reading experience.

## Use cases
- read epub and pdf books on a kindle or kobo
- reflow scanned pdfs for e-ink reading
- replace stock ereader software with a faster reader
- browse and download ebooks via opds catalogs
- sync library with calibre wirelessly
- look up words with dictionaries while reading
- read ebooks on an android tablet with customizable typography

## When to choose
- you own an e-ink device like Kindle, Kobo, PocketBook, or reMarkable and want a faster, more customizable reader
- you need broad format support including reflowable and fixed-layout documents
- you want dictionary lookups, OPDS, Wikipedia, and translation integration built in
- you want a plugin-extensible reader with OTA updates

## When to avoid
- you want a simple consumer-grade reading app with minimal configuration
- you need DRM-protected commercial ebooks (e.g., Kindle store books, Adobe DRM)
- you need audiobook or heavy multimedia ebook support
- you only read on iOS, which is not supported

## Facets
- artifact type: application
- maturity: active
- function: pdf, gui, plugin-system, internationalization, file-system
- domain: cross-platform, files, pdf, developer-tools, embedded-systems
- platform: windows, embedded, cross-platform, cli
- tags: ebook-reader, e-ink, ereader, epub, djvu, kindle, kobo, pocketbook, opds, calibre-integration, luajit, document-viewer, pdf-reflow, android, linux, macos

## Member repositories
- koreader/koreader (main) score 89

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:53.242918+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 2026-08-29T16:53:03.898352+00:00, confidence not recorded.
  - readme: https://github.com/koreader/koreader (fetched 2026-08-28T04:11:53.242918+00:00, sha 480b0f413cda)
  - homepage: http://koreader.rocks/ (fetched 2026-08-29T07:50:11.760439+00:00, sha 71278cdcb717)
  - site_page: http://koreader.rocks/doc (fetched 2026-08-29T07:50:11.769617+00:00, sha c341f1e54aa3)
- Data as of 2026-08-30T08:39:29.467469+00:00.