# n4Studies vs Mahidol Library

The clearest difference is price: Mahidol Library at Free against n4Studies's $1.99. Mahidol Library also leads on update cadence (every 3 weeks vs every 4 months) and device support (3 vs 1). n4Studies's advantage is chart position (#186 vs unranked). On ads and in-app purchases there is nothing between them.

Mahidol Library 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, Mahidol Library every 3 weeks. The most recent releases landed on August 7, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | n4Studies | Mahidol Library |
| --- | --- | --- |
| 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 3 weeks** |
| Monetization | Paid | — |
| Best chart rank | **#186** | — |
| Size | 8 MB | 71 MB |
| Requires iOS | 16.0 | **9.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) | [MAHIDOL UNIVERSITY LIBRARY AND KNOWLEDGE CENTER](https://appshunter.io/developer/1180502490) |

## What reviewers say

### n4Studies

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

**Currently charting:** #186 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


### Mahidol Library

[App page](https://appshunter.io/ios/app/mahidol-library/id1475724704)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is n4Studies free?

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

### Is Mahidol Library free?

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

### Do n4Studies or Mahidol Library have ads?

Neither n4Studies nor Mahidol Library shows ads.

### Which is updated more often, n4Studies or Mahidol Library?

n4Studies ships an update every 4 months, and Mahidol Library every 3 weeks. Most recently, n4Studies was updated on August 7, 2026 and Mahidol Library on September 10, 2026.

---

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