# n4Studies — n4Studies

> Calculate sample size and study power for research studies. (iPhone/iPad app by Chetta Ngamjarus.)

- Source: https://appshunter.io/ios/app/n4studies/id680516901 (this page in markdown: same URL + `.md`)
- Developer: [Chetta Ngamjarus](https://appshunter.io/developer/680516904)
- Category: Education, Utilities
- Price: $1.99
- Rating: 5.00/5 from 1 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 8 MB
- Languages: American English
- Released: 2013-08-08
- Data updated: 2026-08-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/n4studies/id680516901/reviews.md

## What is n4Studies?

Ease to calculate the sample size with n4Studies.

n4Studies makes it easy to calculate the sample size and the power of a study. It comes with ABSOLUTELY NO WARRANTY. However, It can help to learn and find the ways to calculate the sample size and power of the study in minutes.

Key features:
• Calculate the sample size for estimating an infinite population mean, finite population mean, infinite population proportion and finite population proportion
• Calculate the sample size for comparing two population means and two population proportions
• Calculate the sample size for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial
• Calculate the power of a study for comparing two population means and two population proportions
• Calculate the power of a study for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial
• Calculate the power of a study for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial
• You can send a result via Email to your colleague

## Key features

- 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

## Chart rankings

- #186 in Top Paid · Education (US App Store)

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/n4studies/id680516901/reviews.md

### 5/5 — ดีเยี่ยม

*2022-10-15, version 1.4.1*

ใช้งานได้จริงค่ะ
ถ้ามีการพัฒนาเพิ่ม อยากให้เพิ่มคำอธิบาย เป็นภาษาไทยเพื่อง่ายต่อการเข้าใจในการเลือกใช้สถิติในการวิจัยค่ะ

### 5/5 — Update version ใหม่

*2020-10-24, version 1.4.1*

ขอยคุณมากนะคะที่ทำให้แอพ กลับมาใช้ได้อีกครั้ง หลัง ดีมากๆ ค่ะ

### 5/5 — 神级软件

*2019-01-21*

希望开发者能继续更新，加入更多的功能！

### 5/5 — Love it

*2017-09-07, version 1.4.1*

Easy to use and learn. 
This is a Thai application.

## Frequently asked questions about n4Studies

### What types of sample size calculations does n4Studies offer?

n4Studies can calculate sample sizes for estimating infinite or finite population means and proportions. It also supports calculations for comparing two population means and two population proportions.

### Can n4Studies help with complex study designs?

Yes, n4Studies supports sample size and power calculations for various study designs including Case-Control, Matched Case-Control, Cohort, Randomized Controlled Trial, Non-inferiority, and Equivalence trials.

### How does n4Studies help with study power?

The app allows users to calculate the statistical power of a study for comparing two population means and proportions, as well as for various complex study designs mentioned previously.

### What is the price of n4Studies?

n4Studies is a paid application, available for purchase at $1.99.

### On which devices can I use n4Studies?

n4Studies is currently supported on iPhone devices.

### How often is n4Studies updated?

The latest version of n4Studies is 2.3, and it was last updated on February 20, 2024. Updates generally occur to improve functionality and address any issues.

### Does n4Studies have ads?

No, n4Studies does not contain advertisements. It is a paid application designed to be ad-free.

### What is the user sentiment for n4Studies?

Based on the available data, n4Studies has a perfect rating of 5.0 stars from 1 review, indicating very positive user sentiment.

## Version history (last 5 releases)

### 2.3 — 2024-02-20

Fix some issues

### 2.2 — 2023-08-03

Version 2.2 - Add the probability calculations from odds ratio and risk ratio

### 2.1 — 2023-06-29

Version 2.1 - Fix about image attachments
Version 2.0 - Change all user interfaces

### 2.0 — 2023-06-27

• Added a sample size for comparing more than two independent groups (three or four groups)

### 1.4.1 — 2014-10-29

This app has been updated by Apple to display the Apple Watch app icon.

• Changed the formulas for calculating the sample size of non-inferiority and superiority trial (two sample design)
• Added the sample size and power calculations for non-inferiority and superiority in one-sample design

## Apps similar to n4Studies

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [BDMS MSO Platform](https://appshunter.io/ios/app/bdms-mso-platform/id1279858677) | — | Free | Education |
| [PSU LibX](https://appshunter.io/ios/app/psu-libx/id6470150838) | — | Free | Education |
| [School MED PSU](https://appshunter.io/ios/app/school-med-psu/id1666142098) | — | Free | Education |
| [We Mahidol](https://appshunter.io/ios/app/we-mahidol/id1425003959) | 3.0 (2) | Free | Education |
| [REXX](https://appshunter.io/ios/app/rexx/id1565089045) | — | Free | Education |
| [RCOSTLog by Deverhood](https://appshunter.io/ios/app/rcostlog-by-deverhood/id6737051896) | — | Free | Education |

## More apps by Chetta Ngamjarus

- [n4Studies Plus](https://appshunter.io/ios/app/n4studies-plus/id6450650727)

All apps by Chetta Ngamjarus: https://appshunter.io/developer/680516904

## Related topics

[n4studies](https://appshunter.io/ios/topics/n4studies) · [sample size calculator app](https://appshunter.io/ios/topics/sample-size-calculator-app)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-07.*