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The right e-reader app is the one that keeps the specific things you rely on—your reading position, bookmarks, highlights, typed notes, or handwriting—available on the devices you actually use. Before choosing, check what syncs, where it syncs, what settings or internet access it requires, and whether you can get annotations out of the app.
Start with how you read
If you read on only one device, annotation tools and library access may matter more than sync. If you switch between a phone, tablet, and dedicated e-reader, test whether the app synchronizes your place and the kinds of marks you make across those devices. Treat each data type separately: an app may sync reading position and typed highlights but handle handwritten notes or exported documents differently.
Also identify where your books come from. The examples below describe workflows documented by the providers; they do not establish compatibility with every ebook, file format, sideloaded title, or third-party device.
Compare the sync behavior, not just the word “sync”
| App or ecosystem | What the cited support page says can sync or be accessed | Important boundary |
|---|---|---|
| Kobo Books | Reading progress automatically syncs between a Kobo eReader and the Kobo Books app. Kobo’s Android instructions also say syncing updates ebooks with bookmarks and annotations made on another device. | The Android sync instructions require an internet connection and a tap on the sync icon. They do not establish annotation behavior for every book or unrelated device. Kobo’s Android sync instructions and Kobo’s eReader/app progress guidance. |
| Amazon Kindle | After syncing, text-based notes and highlights are accessible across Kindle surfaces; sync also downloads pending books and backs up the furthest page read. | Handwritten annotations are currently accessible only across Kindle Scribe devices, according to Amazon. Do not assume handwriting will appear in every Kindle app or device. Amazon Kindle sync guidance. |
| Google Play Books | Supports bookmarks, highlights, and notes. With “Save notes, highlights and bookmarks” enabled, annotations are saved to a Google Drive document for that book. | This is an optional, setting-dependent Drive copy, not merely in-app sync. Publisher copy restrictions may keep highlighted text out of the document. Editing the synced document and then adding annotations can delete those edits; make a copy first if you need to preserve independent changes. Google Play Books instructions. |
| Apple Books | Can sync reading position, bookmarks, notes, and highlights through iCloud across Apple devices. | Users need the same Apple Account and must enable Books in iCloud; library and collection syncing have separate settings. Some books may need downloading on the receiving device, and Books is unavailable in some countries or regions. Apple’s Books sync guidance. |
Check which annotations matter to you
- Reading position: Confirm that your last page or location carries over when you change devices. A synced place does not by itself mean your marks sync too.
- Bookmarks: Check whether the app can save multiple locations and whether those bookmarks are available on your other devices.
- Highlights and typed notes: Look for both cross-device access and a convenient way to browse them, such as a notes or contents view.
- Handwriting: If you annotate with a stylus, check supported hardware specifically. Kindle’s documented boundary is a useful reminder that text annotations and handwriting may follow different rules.
- Export or backup: Decide whether annotations must remain inside the reader or be available elsewhere. Google Play Books offers a Drive document option, but its copy limits and editing behavior matter if you intend to use that document as an independent notebook.
Verify device coverage and setup
“Across devices” can mean within one provider’s ecosystem, not across every operating system. Apple’s cited instructions describe Apple devices and iCloud; Kobo’s cited progress workflow pairs a Kobo eReader with the Kobo Books app. Before committing, check the provider’s current help for your exact phone, tablet, e-reader, and app version.
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#1 Best Overall
Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
- Confirm account and network requirements. Find out whether the app needs a provider account, the same account on each device, an internet connection, or a manual sync action.
- Check cloud and save settings. Look for separate switches for reading data, library/collection sync, or annotation saving. In Google Play Books, the annotation-to-Drive feature is called “Save notes, highlights and bookmarks.” Apple Books requires Books in iCloud to be enabled for its described sync.
- Test with a book you actually read. Add a bookmark, a highlight, and a short note on one device, then open the same book elsewhere and verify each item. For handwriting, test on the specific devices you expect to use.
- Check the route back out. If you need notes outside the app, confirm whether export or a cloud document is available and whether it preserves the text you highlighted. Keep a separate copy before editing a provider-synced document.
Choose by ecosystem and workflow
- Choose Kobo Books as a candidate if you use a Kobo eReader alongside the Kobo Books app and want progress to carry between them. For Android annotation updates, expect to use the app’s internet-connected sync action.
- Choose Kindle as a candidate if you read across Kindle surfaces and rely on text notes and highlights. If handwriting is essential, make Kindle Scribe support a deciding device check rather than assuming parity with text annotations.
- Choose Google Play Books as a candidate if bookmarks, highlights, and notes are enough in the reader, with the option of a book-specific Google Drive document. Consider publisher copy limits and the document’s edit behavior before relying on it as your archive.
- Choose Apple Books as a candidate if your reading devices are Apple devices and you are comfortable using the same Apple Account and iCloud settings for continuity.
These are ecosystem examples, not a universal ranking. The best fit depends on the books you need to open, the devices you own, and whether you need annotations merely to reappear in the reader or to be portable elsewhere.
Quick Recap
Bestseller No. 5
Best Value
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
Sale
UGREEN USB to USB C Adapter Combo 4-Pack, 10Gbps USB C Converter Space Gray
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Rank #3
Sale
Anker USB C Hub, 7in1 Multi-Port USB Adapter, 4K@60Hz USBC to HDMI Splitter
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Rank #2
Anker USB-C Hub, 5-in-1 USB Hub for Laptops, 4K HDMI Multiport Adapter
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
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