# n4Studies vs REXX

The clearest difference is review sentiment: n4Studies at 100% against REXX's 13%. n4Studies also leads on chart position (#186 vs unranked). REXX's advantage is price (Free vs $1.99) and update cadence (monthly vs every 4 months). On ads and in-app purchases there is nothing between them.

REXX 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, REXX monthly. The most recent releases landed on August 7, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | n4Studies | REXX |
| --- | --- | --- |
| 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** | 12.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | **Free** |
| Best chart rank | **#186** | — |
| Size | 8 MB | 62 MB |
| Requires iOS | 16.0 | **12** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) | [VERNITY COMPANY LIMITED](https://appshunter.io/developer/1154404600) |

## 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


### REXX

[App page](https://appshunter.io/ios/app/rexx/id1565089045)

This platform collects and analyzes student learning data, progress, and evaluations for health science training programs. It offers features for inputting learning information, submitting work, and receiving qualitative and quantitative feedback from supervisors.

**Highlights:** Learning record input and progress tracking, Formative feedback provision, Submit work via scanning, Submit work via sending, Qualitative and quantitative evaluation, Data analysis and visualization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is n4Studies free?

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

### Is REXX free?

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

### Do n4Studies or REXX have ads?

Neither n4Studies nor REXX shows ads.

### Which is updated more often, n4Studies or REXX?

n4Studies ships an update every 4 months, and REXX monthly. Most recently, n4Studies was updated on August 7, 2026 and REXX on June 10, 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.*