# Java Prep vs Design Patterns for Devs

The clearest difference is iOS requirement: Java Prep at 16 against Design Patterns for Devs's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Java Prep sells 3 in-app purchases, starting at $0.99 per month and Design Patterns for Devs sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Java Prep ships an update every 6 weeks, Design Patterns for Devs every 3 months. The most recent releases landed on September 14, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Java Prep | Design Patterns for Devs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/design-patterns-for-devs/id6754806188/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 16 MB |
| Requires iOS | **16** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [嘉 邱](https://appshunter.io/developer/1708883953) | [Daniel Gogozan](https://appshunter.io/developer/1664769372) |

## What reviewers say

### Java Prep

[App page](https://appshunter.io/ios/app/java-prep/id6748876631)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $0.99 | per month |
| Quarterly Membership | $2.99 | per 3 months |
| Semi-Annual Membership | $5.99 | per 6 months |


### Design Patterns for Devs

[App page](https://appshunter.io/ios/app/design-patterns-for-devs/id6754806188)

Master software design patterns with interactive flashcards. This app provides comprehensive lessons, code examples, and quizzes to help developers understand and apply architectural concepts for better coding and clearer architecture.

**Highlights:** Interactive flashcards, Gang of Four pattern coverage, Real-world analogies, UML diagrams and code examples, Usage, Pros & Cons, Quizzes for retention

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Java Prep free?

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

### Is Design Patterns for Devs free?

Design Patterns for Devs is free to download, with in-app purchases available.

### Do Java Prep or Design Patterns for Devs have ads?

Neither Java Prep nor Design Patterns for Devs shows ads.

### Which is updated more often, Java Prep or Design Patterns for Devs?

Java Prep ships an update every 6 weeks, and Design Patterns for Devs every 3 months. Most recently, Java Prep was updated on September 14, 2026 and Design Patterns for Devs on September 28, 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.*