Quote:
Originally Posted by DNSB
I would disagree with you. I use both Sigil and calibre's editor. If nothing else, the FlightCrew and epubcheck plugins make Sigil my first choice for epub2 files -- calibre's error check is pretty much an equivalent to the F7 builtin error checker for Sigil. For epub3? Sigil is pretty much your only choice for a free tool.
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There has been an EpubCheck plugin for the calibre Editor for a long time. It works fine for checking epub3 if you want an extra check after calibre's own Check Book.