There is no native Readability app for the Kindle, so a 'Send to Kindle' feature exists to get articles out of Readability and on to Kindle devices.
On the other hand, the Nook has a Readability app, so all you need to do is click 'Read Later' and the article will be sent to your Reading List. It will then load on your Nook when you open Readability.
If you're looking to add articles to your Nook directly from the device, follow these directions.
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