The Tool Desk
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Which e-reader app should you choose?
| App or service | Best fit | What its documentation says syncs | Key condition or limitation |
|---|---|---|---|
| Kindle | Readers who already use Kindle apps or Kindle hardware | Reading position, notes, and highlights | Sync requires an internet connection and must be enabled; handwritten Scribe annotations are limited to Scribe devices. |
| Kobo Books | Readers switching between a Kobo eReader and Kobo Books app | Progress in the same book | Kobo advises syncing both devices if the displayed page does not match; do not assume this covers every sideloaded file or outside loan. |
| Apple Books | Readers whose reading devices are Apple products | Reading position, highlights, notes, and library collections | Use the same Apple Account and enable Books in iCloud settings. Availability varies by country or region. |
| BookFusion | Readers managing personal ebooks across platforms | Its Google Play listing describes sync for ebooks, progress, bookmarks, highlights, and annotations, including a web reader. | An account is required; cloud storage, plan limits, and current availability should suit your needs. |
| Libby with Kobo | Readers borrowing ebooks from a participating library who own a compatible Kobo | Compatible ebook loans can be read on Kobo after syncing | Not every loan is compatible. Libby audiobooks and magazines are not supported on Kobo devices. |
These are documented service capabilities, not results from a head-to-head test. Choose by matching your devices, account, and book sources—not by treating every use of “sync” as equivalent.
How to match an app to your books and devices
If most of your books come from one store
Start with that store’s app and reader. Amazon says Kindle sync makes saved data available to Kindle apps and devices linked to the same account, while Kobo describes progress sync between its eReader and Books app for the same book. That route usually avoids adding another library to manage.
If you read on Apple devices
Apple Books is designed to carry reading position and annotations across Apple devices. Sign in with the same Apple Account on each device and confirm Books is enabled in iCloud settings. Apple notes the service is not available in every country or region.
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If your collection includes personal files or multiple platforms
BookFusion may fit readers who want one library for personal ebooks across devices and a web reader. Its Google Play listing describes support in its integrated reader for EPUB, PDF, CBZ, and CBR, plus cloud sync for progress, bookmarks, highlights, and annotations. Those are listing claims by the developer, not an independent comparison; check current plan limits and decide whether storing ebooks in its cloud fits your preferences.
If you borrow from a library
Check the specific loan workflow before choosing a reader. Libby says many newer Kobo models have built-in OverDrive support. You can borrow on a supported Kobo or borrow in Libby and read compatible books on Kobo after syncing over Wi-Fi with the same library card. Some loans will not sync, and Kobo devices do not support Libby audiobooks or magazines. Older Kobo models may require Adobe Digital Editions to transfer borrowed books. Libby’s help page was last updated February 26, 2026: Reading Libby ebooks on a Kobo ereader.
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What actually syncs—and what does not?
Kindle: position and standard annotations
Amazon says Kindle sync backs up reading position, notes, and highlights to its servers and makes saved data available to linked apps and devices. Sync is enabled by default, requires an internet connection, and can be turned off. If it is off, cross-device position may not be available; notes, highlights, or bookmarks created while sync is disabled may be lost when it is turned back on. See Amazon’s Kindle sync settings help.
For Kindle e-readers, Amazon separately documents syncing pending books and annotations and backing up the furthest page read. Handwritten annotations have a narrower boundary: Amazon says they are available only across Kindle Scribe devices. Details are in Sync Your Kindle E-Reader.
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Kobo: progress for the same book
Kobo says progress automatically syncs between a Kobo eReader and Kobo Books app so you can continue where you left off in the same book. If the page shown does not match, Kobo advises syncing the eReader and app. Its statement does not establish that every external loan or manually added file behaves the same way. See Kobo’s reading-app guidance.
Apple Books: position, notes, highlights, and collections
Apple says Books can sync books and audiobooks, reading position, highlights, notes, and library collections to other Apple devices. Use the same Apple Account and turn on the relevant Books and iCloud settings. See Apple’s Books sync instructions.
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BookFusion: broader personal-library sync, according to its listing
The Google Play listing describes cloud sync for ebooks, reading progress, bookmarks, highlights, and annotations, and says the service includes a web reader. It requires an account to sync. The listing was updated September 3, 2026; its descriptions should be treated as vendor claims, and current plan limits can change. See BookFusion on Google Play.
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- Use the same account. Sign into the same Kindle, Kobo, or Apple account on every device where you expect the service’s sync to work. For Libby-to-Kobo loans, Libby specifies the same library card.
- Enable the relevant sync setting. On Kindle, confirm sync is not turned off. For Apple Books, enable Books in iCloud settings. Kobo’s guidance is to sync the eReader and app when progress does not match.
- Connect to the internet when syncing. Kindle explicitly requires an internet connection. Libby says compatible loans are synced to Kobo over Wi-Fi. Do not assume offline changes have already reached another device.
- Verify the book source and format. A store purchase, a library loan, and a file you added yourself may follow different rules. Confirm that the title is supported in the specific app or reader before relying on position sync.
- Check the exact annotation type you need. Kindle documents notes and highlights, but Scribe handwriting sync is restricted to Scribe devices. Apple documents notes and highlights. A service’s claim to sync “annotations” does not by itself establish that every annotation format works on every device.
The available documentation does not fully explain how each service resolves conflicting offline changes. If you read on more than one device while disconnected, connect and sync before making further changes elsewhere rather than assuming all progress or annotations will merge cleanly.
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Windows Kindle readers: use the current app
Amazon’s UK help page says the Legacy Kindle app, previously called Kindle for PC, is unsupported as of June 30, 2026, and directs Windows readers to the new Kindle for Windows app. Because software support changes, check Amazon’s current guidance before installing or troubleshooting an older Windows app. The date and support statement apply to Amazon’s UK help page.
Quick Recap
Quick decision checklist
- Already own Kindle books or a Kindle e-reader? Start with Kindle and confirm sync is enabled on each device.
- Move between a Kobo eReader and Kobo Books? Kobo documents automatic progress sync for the same book.
- Read primarily on an iPhone, iPad, or Mac? Consider Apple Books, provided it is available in your region and Books is enabled in iCloud.
- Keep a personal EPUB/PDF or comic library across platforms? Review BookFusion’s supported formats, cloud approach, and current plan limits before committing.
- Borrow ebooks through Libby? Confirm that both your Kobo model and the particular loan are compatible; do not expect Libby audiobooks or magazines to transfer to Kobo.
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