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Quoth · 06-03-2020, 01:25 AM

Try BookNook
I've no connection, but their top Guru posts here as Hitch and writes much sense.

A basic Mobi (real old mobi) is very basic compared to epub2. That's why all Kindles that aren't ancient actually uses KF8, in the .azw file ending package, which is sort of Amazon's wrapper and DRM (optionally) on ePub2. There is a special kind of mobi file for when you don't know what model of kindle someone has, it's the old mobi and the newer KF8 used in azw in a "mobi" file. All touch models of kindles, some earlier ones, the Amazon tablet (Fire), the Kindle apps/programs for Mac, PC, iOS and Android all use the azw (KF8) and many can use KFX.
EVERYTHING ELSE in the last ten years is epub. Even Amazon convert epub to the mobi, azw or kfx depending on the model of Kindle.
On iOS (iPhone or iPad) you either use Apple's app with books from their store (which are really epub), or install a 3rd party app, which include Kindle (only really for ebooks from Amazon) or an ePub app.

The only use for actual mobi is for ancient Kindles. The only use for dual Mobi is when you don't know what model Kindle someone has, then you get Calibre to produce a Dual Mobi that has old mobi and KF8 (azw) in it, the only current use case for that is Kindle downloads from Smashwords.

Everything else is epub2. The epub3 is really only needed to simulate PDFs and few of its features are implemented by anything.

06-03-2020, 01:25 AM	#8
Quoth Still reading Posts: 14,237 Karma: 105299897 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	Try BookNook I've no connection, but their top Guru posts here as Hitch and writes much sense. A basic Mobi (real old mobi) is very basic compared to epub2. That's why all Kindles that aren't ancient actually uses KF8, in the .azw file ending package, which is sort of Amazon's wrapper and DRM (optionally) on ePub2. There is a special kind of mobi file for when you don't know what model of kindle someone has, it's the old mobi and the newer KF8 used in azw in a "mobi" file. All touch models of kindles, some earlier ones, the Amazon tablet (Fire), the Kindle apps/programs for Mac, PC, iOS and Android all use the azw (KF8) and many can use KFX. EVERYTHING ELSE in the last ten years is epub. Even Amazon convert epub to the mobi, azw or kfx depending on the model of Kindle. On iOS (iPhone or iPad) you either use Apple's app with books from their store (which are really epub), or install a 3rd party app, which include Kindle (only really for ebooks from Amazon) or an ePub app. The only use for actual mobi is for ancient Kindles. The only use for dual Mobi is when you don't know what model Kindle someone has, then you get Calibre to produce a Dual Mobi that has old mobi and KF8 (azw) in it, the only current use case for that is Kindle downloads from Smashwords. Everything else is epub2. The epub3 is really only needed to simulate PDFs and few of its features are implemented by anything.