We actually maintain an open source tool called Bookcision which is for easily exporting your Kindle highlights which follows roughly the same approach we take

We actually maintain an open source tool called Bookcision which is for easily exporting your Kindle highlights which follows roughly the same approach we take (but is non-automatic, unlike our product): https://readwise.io/bookcision https://readwise.io/bookcision https://github.com/tristanh/bookcision https://github.com/tristanh/bookcision Readers should have access to their own reading data! :)