# DSJ Engage App vs PSI Prep App

The clearest difference is in-app purchases: DSJ Engage App at none against PSI Prep App's 7. DSJ Engage App also leads on iOS requirement (10.0 vs 16.0). PSI Prep App's advantage is update cadence (every 3 weeks vs every 15 months). On price, ads and device support there is nothing between them.

Both are free to download. PSI Prep App sells 7 in-app purchases, starting at $5.99 per 7 days. DSJ Engage App asks for nothing beyond the download.

DSJ Engage App ships an update every 15 months, PSI Prep App every 3 weeks. The most recent releases landed on October 11, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | DSJ Engage App | PSI Prep App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (225 ratings)](https://appshunter.io/ios/app/psi-prep-app-test/id6765638175/reviews)** |
| Number of ratings | — | **225** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 19 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Double First Ltd](https://appshunter.io/developer/1029038226) | [Syed Sahib Sultan](https://appshunter.io/developer/1772841767) |

## What reviewers say

### DSJ Engage App

[App page](https://appshunter.io/ios/app/dsj-engage-app/id1203210449)

**Features:** macOS Compatibility

**In-app purchases:** none


### PSI Prep App

[App page](https://appshunter.io/ios/app/psi-prep-app-test/id6765638175)

Prepare for professional licensing exams with a comprehensive study tool. Access over 1500 practice questions across various categories to test your knowledge and build confidence before exam day. Ideal for students and professionals seeking a convenient and effective way to study.

**Highlights:** 1500+ practice questions, Multiple exam categories, Study important topics, Test understanding, Build confidence, Convenient practice

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PSI Prep Premium Weekly | $5.99 | per 7 days |
| PSI Prep Premium Monthly | $12.99 | per month |
| PSI Prep Premium Weekly | $14.99 | per 7 days |
| PSI Prep Premium Monthly | $24.99 | per month |
| PSI Prep Premium Yearly | $34.99 | per year |
| PSI Prep Premium 6 Months | $39.99 | per 6 months |
| PSI Prep Premium Yearly | $59.99 | per year |


## Frequently asked questions

### Is DSJ Engage App free?

DSJ Engage App is free to download, with no in-app purchases.

### Is PSI Prep App free?

PSI Prep App is free to download, with in-app purchases available.

### Do DSJ Engage App or PSI Prep App have ads?

Neither DSJ Engage App nor PSI Prep App shows ads.

### Which is updated more often, DSJ Engage App or PSI Prep App?

DSJ Engage App ships an update every 15 months, and PSI Prep App every 3 weeks. Most recently, DSJ Engage App was updated on October 11, 2026 and PSI Prep App on October 23, 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.*