Readest vs Send to X4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Readest
This app is a powerful ebook reader designed for deep thinkers and researchers. It offers advanced annotation tools, seamless device syncing, and robust library management with OPDS and Calibre support. Enjoy a distraction-free reading experience with customizable modes and multi-book viewing for enhanced study and analysis.
- OPDS Online Libraries
- Calibre Integration
- Sync Across Devices
- Bookshelf Management
- Customizable Reading Modes
- Multi-Book View
- Advanced Annotations & Highlights
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Readest is an ebook reader for people who read a lot, and who want their books, notes and reading position on whatever device is nearest. Open EPUB, PDF, MOBI, AZW3, FB2, CBZ, TXT and Markdown in one library. Pull books from OPDS catalogs or from your own Calibre server. Read, annotate, listen, translate. Made for iPhone and iPad • CarPlay, so you can keep listening on the road with playback controls on the dashboard • Download read-aloud voices per book and listen with no connection at all • Add books from Files, Mail or any share sheet, and read them in place instead of copying them into a second library • Open up to four books at once on iPad and arrange them how you like Reading • Paginated or scrolling, with custom fonts, themes, spacing and margins • Vertical text for CJK books • Contrast and refresh tuned for e-ink screens • Full-text search inside a book Your library • Browse, search and download from OPDS catalogs and public libraries • Connect to Calibre or Calibre-Web, covers and metadata included • Organize with bookshelf groups you can rename Notes • Highlights, bookmarks and structured notes • Copy a highlight together with a deep link back to the passage • Export your annotations Listening and languages • Text-to-speech with downloadable offline voices • Translate a sentence, a page, or an entire book • Wikipedia and dictionary lookup without leaving the page Sync • Readest Cloud, or bring your own: iCloud, Google Drive, OneDrive, WebDAV, S3 • KOReader sync keeps your progress in step with your e-reader • iPhone, iPad, Mac, all other platforms and the web Readest is open source. Support: support@readest.com Privacy Policy: https://readest.com/privacy-policy Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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 rating: Send to X4 at 5.0 against Readest's 4.5. Send to X4 also leads on in-app purchases (none vs 6) and update cadence (daily vs fortnightly). Readest's advantage is ratings volume (178 vs 4). On price, ads, device support and iOS requirement 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. Readest sells 6 in-app purchases, starting at $4.99 per month. Send to X4 asks for nothing beyond the download.
Send to X4 holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Readest has 178 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 85% of Readest's written reviews are positive against 100% of Send to X4's.
Readest ships an update fortnightly, Send to X4 daily. The most recent releases landed on September 22, 2026 and August 21, 2026 respectively.
| Parameter | Readest | Send to X4 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (178 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 85.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 178 — better | 4 |
| Update frequency | Fortnightly | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 67 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Bilingify LLC | Jaime Chapinal |
Customer experience
Readest
Send to X4
In-app purchases
Readest
- Subscribe to Plus Plan$4.991 Month
- Subscribe to Pro Plan$9.991 Month
- 1 GB$9.99
- 2 GB$14.99
- 5 GB$29.99
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- 10 GB$49.99
Send to X4
No in-app purchases









