# n4Studies vs School MED PSU

The clearest difference is price: School MED PSU at Free against n4Studies's $1.99. School MED PSU also leads on device support (3 vs 1). n4Studies's advantage is chart position (#189 vs unranked). On update cadence, ads, in-app purchases and iOS requirement there is nothing between them.

School MED PSU is free to download; n4Studies costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

n4Studies ships an update every 4 months, School MED PSU every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | n4Studies | School MED PSU |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/n4studies/id680516901/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Best chart rank | **#189** | — |
| Size | 8 MB | 37 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) | [PRINCE OF SONGKLA UNIVERSITY](https://appshunter.io/developer/1456089991) |

## What reviewers say

### n4Studies

[App page](https://appshunter.io/ios/app/n4studies/id680516901)

**Currently charting:** #189 Top Paid · Education (US App Store)

This application simplifies sample size and study power calculations for various research designs. It offers tools for estimating population means and proportions, comparing groups, and analyzing different study types like case-control and randomized controlled trials. Results can be easily shared via email.

**Highlights:** Calculate sample size for infinite/finite populations, Compare two population means/proportions, Calculate sample size for various study designs, Calculate study power for comparisons, Calculate study power for various study designs, Share results via email

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

**In-app purchases:** none


### School MED PSU

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

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

**In-app purchases:** none


## Frequently asked questions

### Is n4Studies free?

n4Studies costs $1.99, with no in-app purchases.

### Is School MED PSU free?

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

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

Neither n4Studies nor School MED PSU shows ads.

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

n4Studies ships an update every 4 months, and School MED PSU every 2 months. Most recently, n4Studies was updated on October 24, 2026 and School MED PSU 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.*