# School MED PSU vs n4Studies Plus

The clearest difference is price: School MED PSU at Free against n4Studies Plus's $7.99. School MED PSU also leads on device support (3 vs 1). On update cadence, ads, in-app purchases and iOS requirement there is nothing between them.

School MED PSU is free to download; n4Studies Plus costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | School MED PSU | n4Studies Plus |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/n4studies-plus/id6450650727/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | — | Paid |
| Size | 37 MB | 16 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [PRINCE OF SONGKLA UNIVERSITY](https://appshunter.io/developer/1456089991) | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) |

## What reviewers say

### School MED PSU

[App page](https://appshunter.io/ios/app/school-med-psu/id1666142098)

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

**In-app purchases:** none


### n4Studies Plus

[App page](https://appshunter.io/ios/app/n4studies-plus/id6450650727)

This app simplifies sample size and study power calculations for various research designs. It offers tools for regression, survival analysis, diagnostic studies, and more, helping users find calculations in minutes.

**Highlights:** Sample size calculation for regression, Sample size for survival analysis, Sample size for diagnostic and cross-over studies, Sample size for population means and proportions, Sample size for case-control and cohort studies, Study power calculations, Email output sharing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is School MED PSU free?

School MED PSU is free to download, with no in-app purchases.

### Is n4Studies Plus free?

n4Studies Plus costs $7.99, with no in-app purchases.

### Do School MED PSU or n4Studies Plus have ads?

Neither School MED PSU nor n4Studies Plus shows ads.

### Which is updated more often, School MED PSU or n4Studies Plus?

School MED PSU ships an update every 2 months, and n4Studies Plus every 2 months. Most recently, School MED PSU was updated on October 24, 2026 and n4Studies Plus on October 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.*