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Ebook reading progress sync; Android and Kobo
(slrpnk.net)
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I think Koreader has built in progress sync.
It does. I have 2 different e-readers I regularly use and it's super simple.
It does, and it supports Linux and macOS too
Readest (https://readest.com/) can also use KOReader sync and works on iOS, Windows, and on the web.