Sigil

Input—per 1M tokens

Output—per 1M tokens

Context—tokens

WeightsClosed

About

Sigil is ranked #8 of 28 in eBook creation software on Inferse. It runs on Linux, macOS, Windows. There is a free plan.

Compared on eBook creation software

Free plan: Yessigil-ebook.com
EPUB export: Yessigil-ebook.com
Ebook validation: Yessigil-ebook.com
Import formats: EPUB, HTML, images, stylesheetssigil-ebook.com

Facts

Purpose: Sigil is an EPUB editor designed to help users create and format ebooks.sigil-ebook.com · 3 Oct 2026
Audience: The project describes Sigil as suitable for personal ebook formatting and professional editors publishing on multiple platforms.sigil-ebook.com · 3 Oct 2026
License: Sigil is free and open source under GPLv3.sigil-ebook.com · 3 Oct 2026
EPUB support: Sigil supports EPUB 2 and EPUB 3 specifications.sigil-ebook.com · 3 Oct 2026
Editing features: It offers Code View and Preview View, direct EPUB syntax editing, and a table of contents generator with multi-level heading support.sigil-ebook.com · 3 Oct 2026
Import and cleanup: Sigil supports importing EPUB and HTML files, images, and style sheets, and can mend or prettify imported files.sigil-ebook.com · 3 Oct 2026
Search and spelling: Sigil includes spell checking with configurable dictionaries and regular expression support for Find & Replace.sigil-ebook.com · 3 Oct 2026
Plugins: Sigil supports third-party plugins, which may be open source or proprietary and are not vetted by Sigil developers unless a developer authored them.sigil-ebook.com · 3 Oct 2026
Operating systems: The download page lists Windows x64 and macOS Intel and Arm64 downloads, and offers a Linux AppImage.sigil-ebook.com · 3 Oct 2026
Version requirements: The Windows installer requires Windows 10 version 1809 or newer, and current Sigil requires macOS 13 or newer.sigil-ebook.com · 3 Oct 2026
Download integrity: Release files have automatically generated SHA-256 checksums available on the GitHub releases page.sigil-ebook.com · 3 Oct 2026
Release signing: Since Sigil v0.9.9, Git tags and source archives used for releases are signed with Doug Massay’s PGP key.sigil-ebook.com · 3 Oct 2026
Support: The official user support forum is on MobileRead, and the developers say direct support emails will almost always go unanswered because this is a volunteer community project.sigil-ebook.com · 3 Oct 2026
WYSIWYG editing: Sigil’s former Book View WYSIWYG editor was removed; the separate PageEdit application can be launched through Sigil’s Open With feature or external editor button.sigil-ebook.com · 3 Oct 2026