The Tool Desk
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This guide covers the Kindle app only. Apple Books is a separate app with its own library, so its iCloud settings won’t sync Kindle titles.
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Sync manually in the Kindle app
- Make sure the iPhone has a working internet connection (Wi-Fi or cellular).
- Open the Kindle app.
- Tap More in the navigation bar.
- Tap Sync now.
- Check that the last-synced date and time have changed.
You don’t need a Kindle e-reader for any of this. Everything happens in the app and your Amazon account.
Check that automatic sync is on
Amazon says sync is on by default for Kindle apps and devices, and it needs an internet connection. To confirm it on your iPhone, go to More > Settings (gear icon) > Sync.
#1 Best Overall
- Light and compact - With adjustable brightness, high contrast ratio, and fast page turns.
- Effortless reading in any light - Read comfortably with a 6“ glare-free display, adjustable front light—now 25% brighter at max setting—and dark mode.
- Escape into your books - Tune out messages, emails, and social media with a distraction-free reading experience.
- Read for a while - Get up to 6 weeks of battery life on a single charge.
- Take your library with you – 16 GB storage holds thousands of books.
The account-level switch is on Amazon’s website, under Manage Your Content and Devices > Preferences > Sync Settings. Amazon describes sync as saving your reading position, notes and highlights to its servers. Any Kindle app or device linked to the same account can then use them. If it’s turned off at either level, your position and annotations won’t follow you between devices.
If a book or update is missing
Work through these steps in order, following Amazon’s support guidance.
Rank #2
- Light and compact - With adjustable brightness, high contrast ratio, and fast page turns.
- Effortless reading in any light - Read comfortably with a 6“ glare-free display, adjustable front light—now 25% brighter at max setting—and dark mode.
- Escape into your books - Tune out messages, emails, and social media with a distraction-free reading experience.
- Read for a while - Get up to 6 weeks of battery life on a single charge.
- Take your library with you - 16 GB storage holds thousands of books.
1. Check the connection and sync again
Confirm the iPhone is online, then tap More > Sync now.
2. Clear library filters
In the Kindle library, choose All and remove any active filters. Refresh the library and search for the title. Sorting by Recent moves a newly added book toward the top.
Rank #3
- Our fastest Kindle Paperwhite ever – The next-generation 7“ Paperwhite display has a higher contrast ratio and 25% faster page turns.
- Ready for travel – The ultra-thin design has a larger glare-free screen so pages stay sharp no matter where you are.
- Escape into your books – Your Kindle doesn’t have social media, notifications, or other distracting apps.
- Battery life for your longest novel – A single charge via USB-C lasts up to 12 weeks.
- Read in any light – Adjust the display from white to amber to read in bright sunlight or in the dark.
3. Deliver the book from your Amazon account
On Amazon’s site, open Manage Your Content and Devices and choose Content > Books. Find the title and use Deliver or remove from device to send it to your iPhone’s Kindle app. Then sync again.
4. Confirm the purchase went through
If the title isn’t listed in your content, open Your Orders > Digital Orders. Make sure the order is complete. If payment is incomplete, resolve that first.
Rank #4
- Our fastest Kindle Paperwhite ever – The next-generation 7“ Paperwhite display has a higher contrast ratio and 25% faster page turns.
- Ready for travel – The ultra-thin design has a larger glare-free screen so pages stay sharp no matter where you are.
- Escape into your books – Your Kindle doesn’t have social media, notifications, or other distracting apps.
- Battery life for your longest novel – A single charge via USB-C lasts up to 12 weeks.
- Read in any light – Adjust the display from white to amber to read in bright sunlight or in the dark.
5. Update, remove and re-download
Update the Kindle app, and update the book if an update is offered. If the title still misbehaves, remove its download from the iPhone, sync, and download it again.
Amazon’s library-troubleshooting page also mentions restarting a Kindle device. That applies to e-readers, so you can skip it for the iPhone app.
Best Value
- Our fastest Kindle Paperwhite ever – The next-generation 7“ Paperwhite display has a higher contrast ratio and 25% faster page turns.
- Upgrade your reading experience – The Signature Edition features an auto-adjusting front light, wireless charging, and 32 GB storage.
- Ready for travel – The ultra-thin design has a larger glare-free screen so pages stay sharp no matter where you are.
- Escape into your books – Your Kindle doesn’t have social media, notifications, or other distracting apps.
- Adapts to your surroundings – The auto-adjusting front light lets you read in the brightest sunlight or late into the night.
Ebook sync versus Whispersync for Voice
Ordinary sync covers your library and reading data: position, notes and highlights. Whispersync for Voice is the separate feature that keeps an ebook and its audiobook in step. Amazon Customer Service states: “Whispersync for Voice automatically syncs your audiobooks with eBooks if you own or borrow both versions.”
If switching between the two formats isn’t working, Amazon recommends checking these:
- Wireless connectivity.
- The account-wide Sync Settings.
- The sync option in the app or device.
- That the app, device and book version are up to date.
- As a last step, removing the book download, syncing, and downloading it again.
You must own or borrow both versions, and the title has to support the feature.
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Kindle versus Apple Books
| Item | Kindle app | Apple Books |
|---|---|---|
| Where purchases live | Your Amazon account | Your Apple Account |
| Where sync is controlled | Kindle app More > Settings > Sync and Amazon’s Sync Settings | iCloud Drive and Books must be enabled in Apple settings |
| Manual sync | More > Sync now | Not applicable to Kindle books |
Apple’s instructions say to use the same Apple Account on each device. Kindle books follow your Amazon account instead.
Amazon’s guidance in this area is current as of October 2026, but app menus can change. If a label above differs on your screen, look for the nearest equivalent under More.
Quick Recap
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