# PTTEP E vs Send to X4

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.

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 October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | PTTEP E | Send to X4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/send-to-x4/id6758729873/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | — | Free |
| Size | 25 MB | 34 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [BOOKDOSE COMPANY LIMITED](https://appshunter.io/developer/459445000) | [Jaime Chapinal](https://appshunter.io/developer/1855881822) |

## What reviewers say

### PTTEP E

[App page](https://appshunter.io/ios/app/pttep-e-library/id892711615)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Send to X4

[App page](https://appshunter.io/ios/app/send-to-x4/id6758729873)

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.

**Highlights:** Convert articles to EPUB, Import custom EPUB files, Send text notes, Design custom screensavers, Browse e-ink wallpapers, Manage device files

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PTTEP E free?

PTTEP E is free to download, with no in-app purchases.

### Is Send to X4 free?

Send to X4 is free to download, with no in-app purchases.

### Do PTTEP E or Send to X4 have ads?

Neither PTTEP E nor Send to X4 shows ads.

### Which is updated more often, PTTEP E or Send to X4?

PTTEP E ships an update every 3 months, and Send to X4 daily. Most recently, PTTEP E was updated on October 7, 2026 and Send to X4 on October 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*