# 码虫刷题 vs Z2Y Java Principles

The clearest difference is price: 码虫刷题 at Free against Z2Y Java Principles's $1.99. Z2Y Java Principles's advantage is device support (4 vs 2) and iOS requirement (15.6 vs 18.0). On update cadence, ads and in-app purchases there is nothing between them.

码虫刷题 is free to download; Z2Y Java Principles costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

码虫刷题 ships an update every 8 days, Z2Y Java Principles every 5 days. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 码虫刷题 | Z2Y Java Principles |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.2 (9 ratings)](https://appshunter.io/ios/app/408/id1577327212/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 5 days** |
| Monetization | Free | — |
| Size | 65 MB | 257 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 4+ |
| Developer | [Nanjing Mushi Education Technology Co., Ltd.](https://appshunter.io/developer/1467187988) | [洁 欧阳](https://appshunter.io/developer/1715570257) |

## What reviewers say

### 码虫刷题

[App page](https://appshunter.io/ios/app/408/id1577327212)

This app helps users prepare for the 408 computer science postgraduate entrance exam. It offers daily practice, topic-specific drills, past paper simulations, and a错题笔记 feature for note-taking and peer interaction. It also provides admissions information for nearly 500 computer science graduate programs.

**Highlights:** Daily practice plans, Topic-specific drills, Past paper simulations, Error tracking and notes, University admissions data

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

**In-app purchases:** none


### Z2Y Java Principles

[App page](https://appshunter.io/ios/app/z2y-java-principles/id6504158005)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 码虫刷题 free?

码虫刷题 is free to download, with no in-app purchases.

### Is Z2Y Java Principles free?

Z2Y Java Principles costs $1.99, with no in-app purchases.

### Do 码虫刷题 or Z2Y Java Principles have ads?

Neither 码虫刷题 nor Z2Y Java Principles shows ads.

### Which is updated more often, 码虫刷题 or Z2Y Java Principles?

码虫刷题 ships an update every 8 days, and Z2Y Java Principles every 5 days. Most recently, 码虫刷题 was updated on October 3, 2026 and Z2Y Java Principles on October 10, 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.*