PTTEP E vs Send to X4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PTTEP E
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The PTTEP E-Library app offers you a digital life of reading on mobile devices. It enables you to enjoy a popular e-books, e-magazines as well as e-books published by PTTEP. It is totally FREE for the company’s employee. “We create happiness in all reading with excellent service and green technology.” About PTTEP E-Library App. Cloud Library All eBooks you download will be stored automatically in the cloud library, allowing you to enjoy them on up to three devices. Bookmarks, the current page you're enjoying, and all other data are synced across all your devices. Enjoy eBook Anytime, Anywhere All eBooks you borrowed will be available for re downloads for an unlimited number of times until expiry date, so you can enjoy them even after you change your device or upgrade the OS. Once downloaded on the device, you will be able to enjoy your eBooks anytime, anywhere, even in places where Internet connection isn't available. Easy and Simple It's easy and simple to use the app, and it's equipped with intuitive tools allowing you to bookmark your eBooks, write notes and comments, search for words, and more. Bookshelves Personal bookshelves or “My Shelf” allows you to organize your eBooks on your devices easily. In case not enough memory is available on your device, it's OK to delete them from your bookshelves, because they would be stored in the cloud library for you to download again anytime.
Send to X4
Wirelessly send articles, notes, and custom screensavers to your e-ink reader. Convert web content to EPUBs, import your own files, and manage content directly on the device. Enjoy a private, cloud-free experience over local WiFi.
- Convert articles to EPUB
- Import custom EPUB files
- Send text notes
- Design custom screensavers
- Browse e-ink wallpapers
- Manage device files
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Your all-in-one companion for the Xteink X4 e-ink reader. Send articles, notes, custom screensavers, and EPUB files — all over WiFi, with zero cloud accounts. • ARTICLES TO EPUB IN SECONDS Paste any URL or tap Share from your browser. Send to X4 strips ads and clutter, then converts articles into clean EPUBs optimized for e-ink. Supports threads, long-form content, and image-rich pages. Queue multiple articles and batch-send them all at once — even pre-download them for offline sending later. • IMPORT YOUR OWN EPUBs Already have EPUB files? Pick them from your device and send them straight to the X4. No conversion needed. • QUICK NOTES Type or paste any text and send it to your X4 as a .txt file. Perfect for meeting notes, to-do lists, or reading lists. Drafts are saved automatically. • SLEEP SCREEN DESIGNER Create your own lock screen with the built-in editor. Add text, images, and freehand doodles. Use the Sign mode for full-screen to-do lists that auto-size to fill the display. Enable "Overwrite Default" to always replace the same file — your X4 lock screen becomes a living to-do list. • >1,000+ E-INK WALLPAPERS Browse curated wallpapers from x4ePapers (lowio.xyz and readme.club). Preview, send, or try a random pick. New wallpapers added regularly. • PHOTOS TO SCREENSAVERS Pick any photo from your gallery. It is automatically cropped, resized, and converted to a 480x800 BMP ready for the X4 display. • DEVICE FILE MANAGER Browse articles, notes, and screensavers already on the device. Preview sleep screen thumbnails. Swipe to delete files you no longer need. • 100% PRIVATE Everything transfers over local WiFi. No cloud. No accounts. No tracking. Your data stays between your phone and your X4. • WORKS WITH ALL FIRMWARE Full support for both Stock and CrossPoint firmware. Configurable IP, custom storage folders, and optional date-based subfolders to keep everything organized.
Screenshots
Verdict
The clearest difference is update cadence: Send to X4 at daily against PTTEP E's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PTTEP E ships an update every 3 months, Send to X4 daily. The most recent releases landed on September 19, 2026 and September 16, 2026 respectively.
| Parameter | PTTEP E | Send to X4 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 4 — better |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 25 MB | 34 MB |
| Age rating | 9+ | 4+ |
| Developer | BOOKDOSE COMPANY LIMITED | Jaime Chapinal |
In-app purchases
PTTEP E
No in-app purchases
Send to X4
No in-app purchases









