# PSIS4 vs PSIS GPP

The clearest difference is update cadence: PSIS GPP at every 6 months against PSIS4's every 20 months. PSIS GPP 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.

PSIS4 ships an update every 20 months, PSIS GPP every 6 months. The most recent releases landed on September 22, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | PSIS4 | PSIS GPP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 20 months | **Every 6 months** |
| Size | 30 MB | 87 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [YONG SOKHENG](https://appshunter.io/developer/1702023342) | [sovon khom](https://appshunter.io/developer/1332592182) |

## What reviewers say

### PSIS4

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

**In-app purchases:** none


### PSIS GPP

[App page](https://appshunter.io/ios/app/psis-gpp/id6751321876)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PSIS4 free?

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

### Is PSIS GPP free?

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

### Which is updated more often, PSIS4 or PSIS GPP?

PSIS4 ships an update every 20 months, and PSIS GPP every 6 months. Most recently, PSIS4 was updated on September 22, 2026 and PSIS GPP on October 18, 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.*