# REXX vs n4Studies Plus

The clearest difference is price: REXX at Free against n4Studies Plus's $7.99. REXX also leads on review sentiment (13% vs 0%) and device support (3 vs 1). On update cadence, ads and in-app purchases there is nothing between them.

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

REXX ships an update monthly, n4Studies Plus every 2 months. The most recent releases landed on June 10, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | REXX | 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 | **12.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 62 MB | 16 MB |
| Requires iOS | **12** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [VERNITY COMPANY LIMITED](https://appshunter.io/developer/1154404600) | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) |

## What reviewers say

### 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


### 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 REXX free?

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

### Is n4Studies Plus free?

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

### Do REXX or n4Studies Plus have ads?

Neither REXX nor n4Studies Plus shows ads.

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

REXX ships an update monthly, and n4Studies Plus every 2 months. Most recently, REXX was updated on June 10, 2026 and n4Studies Plus on September 15, 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.*