# n4Studies vs MSD E

The clearest difference is price: MSD E at Free against n4Studies's $1.99. MSD E also leads on update cadence (every 5 weeks vs every 4 months) and iOS requirement (11.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

MSD E 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, MSD E every 5 weeks. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | n4Studies | MSD E |
| --- | --- | --- |
| 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 5 weeks** |
| Monetization | Paid | — |
| Size | 8 MB | 45 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) | [Deverhood HT Co.,Ltd.](https://appshunter.io/developer/1785579550) |

## What reviewers say

### n4Studies

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

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


### MSD E

[App page](https://appshunter.io/ios/app/msd-e-logbook/id6502573447)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is n4Studies free?

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

### Is MSD E free?

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

### Do n4Studies or MSD E have ads?

Neither n4Studies nor MSD E shows ads.

### Which is updated more often, n4Studies or MSD E?

n4Studies ships an update every 4 months, and MSD E every 5 weeks. Most recently, n4Studies was updated on October 2, 2026 and MSD E on October 5, 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.*