koreader also works on my Kindle. This used to belong to my wife, and got passed to me, and got rooted by me, and koreader installed on it, thus keeping it out of a landfill or generating more e-waste.
Good for you then. Kindle devices have decent hardware but is crippled by the dystopian Amazon firmware on it. It forces upgrades, with no way to opt out, and Amazon have the ability to remotely wipe your books for no reason.
Yeah, the upgrades were why it ended up in my possession in the first place. The "upgraded" software required capabilities that the device did not have, making it super slow.
The point though, was that koreader works there too.