In general (on Android), you need an account to download apps from the Play Store, not to use the phone. You can still install from apk (and install F-Droid for

In general (on Android), you need an account to download apps from the Play Store, not to use the phone. You can still install from apk (and install F-Droid for example), so you can have something like KOReader[0] on Android without giving your data to anyone. [0] KOReader was designed for e-ink displays: http://koreader.rocks/ http://koreader.rocks/