# PSIS4 vs The CAMFIRST School

The clearest difference is update cadence: The CAMFIRST School at weekly against PSIS4's every 20 months. The CAMFIRST School 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, The CAMFIRST School weekly. The most recent releases landed on September 22, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | PSIS4 | The CAMFIRST School |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 20 months | **Weekly** |
| Size | 30 MB | 98 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [YONG SOKHENG](https://appshunter.io/developer/1702023342) | [Panha Sa](https://appshunter.io/developer/1534830463) |

## What reviewers say

### PSIS4

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

**In-app purchases:** none


### The CAMFIRST School

[App page](https://appshunter.io/ios/app/the-camfirst-school/id6463709869)

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

**In-app purchases:** none


## Frequently asked questions

### Is PSIS4 free?

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

### Is The CAMFIRST School free?

The CAMFIRST School is free to download, with no in-app purchases.

### Which is updated more often, PSIS4 or The CAMFIRST School?

PSIS4 ships an update every 20 months, and The CAMFIRST School weekly. Most recently, PSIS4 was updated on September 22, 2026 and The CAMFIRST School on October 9, 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.*