A native Kindle → Hardcover sync

Read in the Kindle's own reader, the way you always do. Endpaper quietly sends your progress, finished books, ratings and highlights to Hardcover.

Download the latest release View on GitHub

For jailbroken Kindles. Free and open source (MIT).

Why Endpaper

The Kindle only talks to Goodreads. If you track your reading on Hardcover, you either update every book by hand, or you replace the Kindle reader with another app such as KOReader, and give up the reader you like.

Endpaper takes a third path. It is a small companion program that only watches the stock reader. It reads the same files the Kindle already keeps about your books, and sends the changes to Hardcover. Nothing about how you read changes.

It was built to stay out of the way: no new reader, no setup over SSH, no settings to tune, and as little battery and storage use as possible.

What it syncs

Reading progress

Your page is sent when you close the book or the Kindle goes to sleep. Forward only: it never moves your progress back.

New books

Start a book and it is added to Currently Reading, matched by ISBN, ASIN, or title and author.

Finished books

Reach the end and the book is marked Read with today's date.

Re-reads

Start a finished book again and Hardcover gets a new read, not an overwrite.

Star ratings

Rate a book on the Kindle's end-of-book screen and the stars go to Hardcover.

Highlights & notes

Sent as private journal entries on the book. Old ones can be imported in one tap.

On your Kindle

The Endpaper page on a Kindle: a QR code and a sign-in code to approve on your phone
Sign in once. Scan the QR code with your phone, or enter the code at hardcover.app/link.
The Endpaper page: signed in, background sync on, last check and last result
See what was sent. Status, last check and last result. Sync runs by itself; "Sync now" is there if you want it.
The Endpaper page: Check setup lists each part with OK
Check setup. One tap tests every part on your Kindle and shows OK or FAIL.

Previews of the Endpaper page, rendered from the app's own page code with sample data.

How it works

Observes, never changes

Reads the Kindle's reading database and files. The Kindle reader and your books stay untouched.

Event driven

Wakes up when you leave a book, the Kindle sleeps or Wi-Fi returns. No constant polling.

Offline friendly

No Wi-Fi? Changes wait and are sent when you are back online.

One tap to manage

An Endpaper item in your library opens a simple page: sign in with a QR code, status, sync now, check setup.

Install

Before you start (recommended): unlink Goodreads on the Kindle (Settings > Your Account). Endpaper works either way, but a linked Goodreads shows "Rating Error" boxes on sideloaded books. Your star ratings still reach Hardcover.

  1. Download endpaper-<version>.zip from the latest release.
  2. Connect the Kindle with USB and unzip the file onto the Kindle drive. You get documents/Endpaper.sh and an endpaper folder.
  3. Eject, then tap Endpaper in your library.
  4. Tap Sign in, scan the QR code with your phone and approve. Done.

After a restart of the Kindle, tap Endpaper once to start sync again. Full instructions, updating and uninstalling: see the README.

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