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Sigil vs Kindle Create: catalog facts
Sigil	Kindle Create
Free Free and open source under the GPL.	Free Free to download and use from Amazon.
Windows, macOS, Linux	macOS
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	Free from Amazon Made for preparing books for the Kindle store
EPUB only; it does not handle MOBI, AZW3 or PDF Some XHTML and CSS knowledge is needed to fix anything non-trivial	Tied to Amazon's Kindle publishing ecosystem Little technical detail on the product page
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.