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KOReader [1] is my favorite reader. Pairs well with my syncthing library of ebooks (I just keep the phone's copy in read-only mode).

[1] https://f-droid.org/en/packages/org.koreader.launcher.fdroid...

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Koreader interface with syncthing is not that user friendly to non techs, very powerful can do anything but i don't think i would advise that to non techie
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KOReader can update over WiFi as well, right?
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Just to add, KOReader might not look super use friendly at first, but I highly recommend giving it a try. It’s an amazing reader.

Once your used to it, the controls are a lot better than stock kindle as well imo.

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To add to this, since the original comment mentioned kindle, you can jailbreak many of the models and install KOReader in them if you want to keep using the hardware.
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And then you can automatically sync your reading process with the KOReader phone app. I use that functionality almost every day for when I don't have my Kindle with me (train ride, lunch break etc).
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Using readera with network connection disabled. Super app.
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KOReader is good, as others have mentioned.

If you want a cross platform option that's pretty good across Android/iOS/Mac/Windows/Linux, Readest[1] Is another great option. It supports syncing a library of ebooks and is licensed under the AGPL[2].

[1]: https://readest.com/

[2]: https://github.com/readest/readest

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FB reader? Sync has to be manually config though (Calibre is simplest but probably not for completely non-technical people)
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It depends.For me it’s not on app For a dedicated device(phablet/tablet) - KoReader. For Smartphone (no longtime reading) - Librera Reader
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Try storyteller. It’s an awesome app that does the whispersync thing where you get the audiobook and ebook together, can switch between the two and not lose place, can read both at the same time where the ebook underlines what’s being said. All self hosted though so you need to have a way to…obtain drm free e/audio books.
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just let her read on kindle, as you've said yourself it's a better option
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Even if you have a FOSS ereader app with good sync, where are you gonna get books to read on it?

The only options are stripping the DRM from kobo books or piracy, last I checked.

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I run Calibre Content Server on a VM. So my ebook reading is just accessing that in the browser. Works great.
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i would say Librera FD, much better on Android than KOR, specially for images
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I actually use MuPDF for epubs, as well as pdfs.
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Me too. It seems to be the only one that does not litter the sdcard directory.
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Honestly I use Lithium with no network permissions. It's not Foss but it's good enough for me.
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