# SKI+ v2 — Secure IM with PQC support

> Secure IM with PQC support (iPhone/iPad app by Academia Sinica Research Center for Information Technology Innovation.)

- Source: https://appshunter.io/ios/app/ski-plus-v2/id6468494003 (this page in markdown: same URL + `.md`)
- Developer: [Academia Sinica Research Center for Information Technology Innovation](https://appshunter.io/developer/432286895)
- Category: Social Networking, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 249 MB
- Languages: English, Chinese
- Released: 2024-04-08
- Data updated: 2026-06-05
- User reviews in markdown: https://appshunter.io/ios/app/ski-plus-v2/id6468494003/reviews.md

## What is SKI+ v2?

SKI+ v2 is an end-to-end instant messaging app with in-depth support of post-quantum encryption algorithms. Message encryption and decryption are completed on the user's device, and the server has no access to these details. Therefore, it provides users with a more privacy-protected messaging system. For more details, please refer to https://www.e2eelab.org.

Feel free to download and use it. If you have any questions or suggestions, please send relevant descriptions or screenshots to: ziv@citi.sinica.edu.tw. We will address your inquiries promptly.


## Version history (last 5 releases)

### 4.1.21 — 2026-06-04

crash issue hotfix

### 4.1.18 — 2026-05-12

Fix bugs.
Improve stability.

### 4.1.15 — 2026-03-27

Fix bugs.
Improve stability.

### 4.1.14 — 2026-03-23

Fix Bugs.
Improve stability.

### 4.1.13 — 2026-03-13

Bug fixed.
Improve stability.

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## More apps by Academia Sinica Research Center for Information Technology Innovation

- [SKI+](https://appshunter.io/ios/app/ski-plus/id1347443378)
- [SKI+ v2 Prem](https://appshunter.io/ios/app/ski-plus-v2-prem/id6654902944)

All apps by Academia Sinica Research Center for Information Technology Innovation: https://appshunter.io/developer/432286895

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*