# Java Mock Free vs Oracle Java SE 21 Developer

The clearest difference is in-app purchases: Java Mock Free at none against Oracle Java SE 21 Developer's 1. Java Mock Free also leads on iOS requirement (8.0 vs 15.1). Oracle Java SE 21 Developer's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Oracle Java SE 21 Developer sells 1 one-off in-app purchase. Java Mock Free asks for nothing beyond the download.

Java Mock Free ships an update every 3 weeks, Oracle Java SE 21 Developer every 4 days. The most recent releases landed on September 17, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Java Mock Free | Oracle Java SE 21 Developer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | Free | — |
| Size | 5 MB | 201 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HARIKRISHNA VALLAKATLA](https://appshunter.io/developer/1024902607) | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) |

## What reviewers say

### Java Mock Free

[App page](https://appshunter.io/ios/app/java-mock-free/id1031093559)

Practice Java programming questions and prepare for exams and interviews. Features include bookmarking, automatic saving of strong/weak areas, and sharing options. Quizzes range from 25 to 250 questions.

**Highlights:** Offline functionality, Mock Java exams, Bookmark favorite questions, Automatic weak/strong question saving, Share questions with friends, Multiple quiz sizes (25-250 questions), Quiz timer

**Features:** macOS Compatibility

**In-app purchases:** none


### Oracle Java SE 21 Developer

[App page](https://appshunter.io/ios/app/oracle-java-se-21-developer/id6785110070)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $4.99 | one-time |


## Frequently asked questions

### Is Java Mock Free free?

Java Mock Free is free to download, with no in-app purchases.

### Is Oracle Java SE 21 Developer free?

Oracle Java SE 21 Developer is free to download, with in-app purchases available.

### Do Java Mock Free or Oracle Java SE 21 Developer have ads?

Neither Java Mock Free nor Oracle Java SE 21 Developer shows ads.

### Which is updated more often, Java Mock Free or Oracle Java SE 21 Developer?

Java Mock Free ships an update every 3 weeks, and Oracle Java SE 21 Developer every 4 days. Most recently, Java Mock Free was updated on September 17, 2026 and Oracle Java SE 21 Developer on September 7, 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.*