Best Book App for Kindle Readers (2026), Sync Compared

For Kindle readers, Goodreads is the best companion app, and the reason is plumbing. Amazon owns both, Goodreads has the deepest Kindle integration of any tracker, and once the accounts are linked, the Kindle app can mark a book Currently Reading when you start it and Read when you finish. None of the other trackers here advertise Kindle sync.

We make Siftivo, which doesn’t sync with Kindle at all, so it sits fourth on this list, behind the apps that do something Kindle-specific.

Sync is settled, so spend your attention on the sample

The tracking question for Kindle readers mostly answers itself. Goodreads syncs. StoryGraph doesn’t advertise Kindle sync, and Kobo is the only device it advertises. Hardcover’s own FAQ says there’s no viable technical solution for direct Kindle sync today. Margins rebuilt its app in September 2026 to prepare for Kindle sync, but hasn’t shipped it. If automatic tracking is what you want most, the decision is made.

The harder part is the thing Kindle makes too easy, which is starting books. Kindle Unlimited lets you hold 20 titles at once with no due dates, and before long the library is a long scroll of books you meant to get to. Every Kindle book can be sampled from the app at no cost, and the sample is the best test you have, because you’re reading the book itself on your own screen before you’ve paid. A sample won’t tell you whether a novel holds up at page 300, but it will tell you whether you want page 2.

So there are two jobs here. One is recording what you read on Kindle. The other is deciding what deserves a sample in the first place.

1. Goodreads

Best for

tracking Kindle reading without logging it by hand

Price

Free

Platforms

Web, iOS, Android, Kindle

Visit Goodreads

Link your Kindle and Goodreads accounts, and your reading progress, shelves and Kindle Notes & Highlights sync across. The Kindle app can mark books Currently Reading and Read on its own, and Kindle books count toward your Reading Challenge once the accounts are linked. In the US, Canada, India and Australia you can also add your Amazon purchases to your shelves. Goodreads costs nothing, its Did Not Finish shelf records how far you got, and with what Goodreads says is more than 75 million members, almost every book has reviews you can read before you send yourself the sample.

The catch is in the edges. Custom shelves and the Did Not Finish shelf don’t appear on Kindle e-readers. The Amazon purchase import skips Kindle Unlimited and Prime Reading borrows, so your KU reading won’t arrive that way. Goodreads can’t import from Libby or OverDrive, import and export are desktop only, and ratings are whole stars.

2. Kindle

Best for

samples, highlights and your place synced on every device

Price

Free app; books and Kindle Unlimited cost extra

Platforms

iOS, Android, Mac, Windows, Web, Kindle e-readers

Visit Kindle

The Kindle app is the reader itself, and it’s worth using well. Any book can be sampled straight from the app. Your place, notes and highlights sync across iOS, Android, Mac, Windows, the web and Kindle e-readers, and My Notebook gathers every highlight in one place. It shows percent read, real page numbers for most top titles and time left at your reading speed, and you can switch to the Audible narration of the same book without leaving the app. It can also tell you when authors you love release new books.

The catch is discovery. The App Store description doesn’t advertise a reading-taste profile or mood filters, and browsing runs on Amazon Charts, genres and samples. Amazon says its recommendations come from what you’ve bought, own and rated, compared with other customers. Not every title opens in Kindle for Web, and since April 22, 2026, each borrowed magazine issue counts toward the 20-title Kindle Unlimited limit.

3. Libby

Best for

sending library ebooks to a Kindle, at US libraries

Price

Free with a library card

Platforms

iOS, Android, Fire tablets, Web

Visit Libby

At US libraries, Libby lets you send most ebooks straight to your Kindle instead of reading in the Libby app. Borrowing costs nothing with a library card, loans return themselves on the due date, and tags keep a list of what you want next. Your library’s own lists and guides are a human-picked way to browse, and the same app handles audiobooks.

The catch is geography and supply. Kindle sending is limited to US libraries, Libby only works with libraries that lend through OverDrive, and a popular title can mean a holds line. Goodreads can’t import from Libby, so if a library loan doesn’t reach your shelves through the Kindle link, add it by hand.

4. Siftivo (ours)

Best for

deciding which book is worth a sample next

Price

No paid plan

Platforms

Web, iOS

Visit Siftivo

Siftivo doesn’t sync with your Kindle, and its job here is deciding what to sample. Tell it three books you love and each day’s three Daily Picks arrive with the book that earned them, while the match badge on any book page says how well it fits you and why. Book pages have a Get it on Amazon link, and our About page says bookseller links are affiliate links. You can choose in Siftivo, tap through to Amazon and send yourself the sample. While you read, you can log progress as a percent, the same number your Kindle shows, and a Goodreads export uploaded on the web brings in your read, currently reading and want to read shelves with your ratings and reviews.

The catch is that every update is by hand, because Siftivo has no Kindle, Kobo or other e-reader sync. The Goodreads import skips custom shelves, the DNF shelf, start dates and date added. There’s no Android app and no export of your data.

5. Fable

Best for

importing your Kindle list into a book club app

Price

Free, or Fable Plus at $5.99/mo or $49.99/yr

Platforms

iOS, Android, Web (store and account only, no clubs or reading)

Visit Fable

Fable imports your book lists from Kindle as well as Goodreads, so a Kindle reader can carry a list into a club app without retyping it. Its clubs give every book chapter-specific discussion rooms, and its tracker covers currently reading, TBR, finished and DNF shelves, half-star ratings and page or percentage progress on the free tier.

The catch is that Fable has its own ebook reader, and Social Mode, where club members see each other’s highlights, lives there, not on your Kindle. The free app shows ads, books and clubs work only on a phone or tablet, and ebook purchases are US only.

My pick

If you want your Kindle reading tracked without logging it by hand, use Goodreads. Link the accounts once and let the Kindle app do the shelving.

If you’re content with the Kindle app alone, make the sample a habit. Read it before every purchase and every Kindle Unlimited borrow.

If you have a US library card, add Libby and send loans to your Kindle before you buy anything at full price.

If the hard part is choosing, use Siftivo to decide, then let the sample confirm it.

What I’d do today

1. Link Kindle and Goodreads. In the Kindle app for iOS, the option is under the More menu.
2. Before your next purchase or Kindle Unlimited borrow, send yourself the sample and read it first.
3. Add your library card to Libby and check whether your library can send loans to Kindle.
4. Tell Siftivo three books you love, then use the Get it on Amazon link on your top pick to send yourself its sample.