# ZYIS App vs PSIS4

The clearest difference is update cadence: ZYIS App at every 5 weeks against PSIS4's every 20 months. ZYIS App also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ZYIS App ships an update every 5 weeks, PSIS4 every 20 months. The most recent releases landed on November 3, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | ZYIS App | PSIS4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/zyis-app/id1609180952/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | Yes | — |
| Update frequency | **Every 5 weeks** | Every 20 months |
| Monetization | Ad-supported | — |
| Size | 92 MB | 30 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 17+ | 4+ |
| Developer | [Panha Sa](https://appshunter.io/developer/1534830463) | [YONG SOKHENG](https://appshunter.io/developer/1702023342) |

## What reviewers say

### ZYIS App

[App page](https://appshunter.io/ios/app/zyis-app/id1609180952)

This app provides information about a trilingual school offering Khmer, Chinese, and English programs from pre-school to high school. It details the school's accreditation, founders, and multiple campus locations, highlighting its expansion due to demand.

**Highlights:** Trilingual education programs (Khmer, Chinese, English), Preschool to high school levels, School accreditation details, Founder information, Multiple campus locations, Expansion updates

**Features:** macOS Compatibility

**In-app purchases:** none


### PSIS4

[App page](https://appshunter.io/ios/app/psis4/id6460007747)

**In-app purchases:** none


## Frequently asked questions

### Is ZYIS App free?

ZYIS App is free to download, with no in-app purchases.

### Is PSIS4 free?

PSIS4 is free to download, with no in-app purchases.

### Which is updated more often, ZYIS App or PSIS4?

ZYIS App ships an update every 5 weeks, and PSIS4 every 20 months. Most recently, ZYIS App was updated on November 3, 2026 and PSIS4 on September 22, 2026.

---

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