While Libby cannot be found in the Amazon App Store on a Kindle device, it is now possible to sideload Libby on a Kindle Fire. The legacy Overdrive app will no longer be available sometime in the beginning of 2023 and is being replaced with Libby. Get ahead of the game by switching to Libby now!
Libby can be downloaded from the Google Play Store or the App Store. You can find instructions on how to sideload Libby on a Kindle Fire here: https://www.overdrive.com/apps/libby/kindlefire
Original source can be found here.