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FOSS ereader app that syncs the page read?
(lemmy.dbzer0.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Assuming your phone is Android and your Kindle books aren't DRMed, KOReader.
Oh wow. It supports Kobos as well. Gonna have to check this out. Thanks.