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

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