Sigil vs Calibre: catalog facts
 Sigil |  Calibre |
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Free Free and open source under the GPL. |
Free Free and open source, funded by donations. |
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Windows, macOS, Linux |
Windows, macOS, Linux |
- Edits EPUB 2 and EPUB 3 in a visual view or directly in the XHTML
- Built-in validation catches the errors that make readers reject a book
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- Converts between all the major ebook formats, including for Kindle
- Fetches metadata and covers from the internet automatically
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- EPUB only; it does not handle MOBI, AZW3 or PDF
- Some XHTML and CSS knowledge is needed to fix anything non-trivial
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- The interface is dense and has accumulated two decades of features
- It will not remove DRM; that requires third-party plug-ins with their own legal questions
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Downloadable app |
Downloadable app |
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Open source |
Open source |
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License: GPL-3.0 |
License: GPL-3.0 |
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No account needed |
No account needed |
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Works offline |
Works offline |
Checked September 21, 2026 | Checked September 20, 2026 |
Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.
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