# SQL vs n4Studies Plus

The clearest difference is rating: n4Studies Plus at 3.0 against SQL's 1.0. SQL's advantage is price ($5.99 vs $7.99) and device support (3 vs 1). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

SQL costs $5.99 and n4Studies Plus $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

n4Studies Plus holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

SQL ships an update every 5 weeks, n4Studies Plus every 2 months. The most recent releases landed on August 16, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | SQL | n4Studies Plus |
| --- | --- | --- |
| Price | **$5.99** | $7.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/sql-er-diagram-pro/id1625278308/reviews) | **[3.0 (1 ratings)](https://appshunter.io/ios/app/n4studies-plus/id6450650727/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Paid | Paid |
| Size | 31 MB | 16 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [Chetta Ngamjarus](https://appshunter.io/developer/680516904) |

## What reviewers say

### SQL

[App page](https://appshunter.io/ios/app/sql-er-diagram-pro/id1625278308)

Design, draw, and share entity relationship diagrams with this app. Generate SQL scripts from your diagrams and access study pages for SQL topics and syntax. Perfect for learning SQL graphically and textually.

**Highlights:** Design and draw ER diagrams, Generate SQL scripts from diagrams, Customizable canvas size, Automatic local saving, Study pages for SQL topics, Learn SQL syntax pages

**Features:** macOS Compatibility, Vision Pro support

**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 SQL free?

SQL costs $5.99, with no in-app purchases.

### Is n4Studies Plus free?

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

### Which has better reviews, SQL or n4Studies Plus?

n4Studies Plus is rated higher. SQL averages 1.0 out of 5 from 1 ratings, while n4Studies Plus averages 3.0 from 1 ratings.

### Do SQL or n4Studies Plus have ads?

Neither SQL nor n4Studies Plus shows ads.

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

SQL ships an update every 5 weeks, and n4Studies Plus every 2 months. Most recently, SQL was updated on August 16, 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.*