What e-reader is suitable for using different reading apps like Kindle, Kobo, iBooks, etc?
Added (1). I am looking for an e-reader where I can read books using different reading apps like Kindle, Kobo, iBooks, etc rather than getting an e-reader designed for one app like Kindle or Kobo. I am not interested having an e-reader with internet and email access as I have other devices which can do this.
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