# Sigil-Ebook/Sigil

Sigil is a multi-platform EPUB ebook editor

Repository: https://github.com/Sigil-Ebook/Sigil
Canonical: https://ross.abutalabs.com/products/sigil
Language: C++
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-23T16:24:04+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 81, longevity 100
- inputs: {"age_days": 4735, "days_push": 10, "days_rel": 46, "gap_med": 49.5, "n_releases_24m": 13}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6936, forks 624 (observed 2026-08-28T04:09:51.606459+00:00)

## What it is
Sigil is a free, open-source, multi-platform EPUB ebook editor built with Qt6 and QtWebEngine. It supports editing both ePub 2 and ePub 3 books with a plugin system and embedded Python.

## Use cases
- edit epub ebooks
- fix formatting in an epub file
- convert manuscripts into epub format
- clean up and validate epub 3 books
- extend ebook editing with python plugins

## When to choose
- you need a dedicated GUI editor for EPUB 2/3 files
- you want a free open-source alternative to commercial ebook editors
- you need cross-platform ebook editing on Linux, macOS, or Windows

## When to avoid
- you need to edit formats other than EPUB, such as MOBI or PDF
- you want fully automated bulk ebook conversion rather than hands-on editing
- you need a headless or command-line-only tool

## Facets
- artifact type: application
- maturity: active
- function: editor, gui, file-system
- domain: files, desktop-applications, developer-tools, cross-platform
- platform: windows, cross-platform
- tags: epub, ebook-editor, qt6, publishing, linux, macos, desktop

## Member repositories
- Sigil-Ebook/Sigil (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:51.606459+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 2026-08-29T17:41:14.657386+00:00, confidence not recorded.
  - readme: https://github.com/Sigil-Ebook/Sigil (fetched 2026-08-28T04:09:51.606459+00:00, sha 205bf23a37b6)
- Data as of 2026-08-30T08:39:29.467469+00:00.