# SKI+ vs Jrsys ZTP

The clearest difference is update cadence: SKI+ at every 3 weeks against Jrsys ZTP'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.

SKI+ ships an update every 3 weeks, Jrsys ZTP every 3 months. The most recent releases landed on September 17, 2026 and July 24, 2026 respectively.

## The numbers

| Metric | SKI+ | Jrsys ZTP |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 127 MB | 42 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Academia Sinica Research Center for Information Technology Innovation](https://appshunter.io/developer/432286895) | [JRSYS INTERNATIONAL CORP.](https://appshunter.io/developer/1070992847) |

## What reviewers say

### SKI+

[App page](https://appshunter.io/ios/app/ski-plus/id1347443378)

A secure messaging app that uses end-to-end encryption for private communication. All message encryption and decryption happen on your device, ensuring your conversations are protected from unauthorized access.

**Highlights:** End-to-end message encryption, Decentralized encryption on device, Secure communication, Photo and video sharing, Location sharing, Contact integration

**Features:** macOS Compatibility

**In-app purchases:** none


### Jrsys ZTP

[App page](https://appshunter.io/ios/app/jrsys-ztp/id1443705151)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SKI+ free?

SKI+ is free to download, with no in-app purchases.

### Is Jrsys ZTP free?

Jrsys ZTP is free to download, with no in-app purchases.

### Do SKI+ or Jrsys ZTP have ads?

Neither SKI+ nor Jrsys ZTP shows ads.

### Which is updated more often, SKI+ or Jrsys ZTP?

SKI+ ships an update every 3 weeks, and Jrsys ZTP every 3 months. Most recently, SKI+ was updated on September 17, 2026 and Jrsys ZTP on July 24, 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.*