# Z2Y Java Principles vs 竹林鸟

The clearest difference is price: 竹林鸟 at Free against Z2Y Java Principles's $1.99. 竹林鸟 also leads on iOS requirement (13.0 vs 15.6). Z2Y Java Principles's advantage is update cadence (every 5 days vs every 4 weeks) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

竹林鸟 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.

Z2Y Java Principles ships an update every 5 days, 竹林鸟 every 4 weeks. The most recent releases landed on October 10, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Z2Y Java Principles | 竹林鸟 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/id6758047946/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 4 weeks |
| Size | 257 MB | 56 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [洁 欧阳](https://appshunter.io/developer/1715570257) | [ZHENGZHOU KUHAN ELECTRONIC TECHNOLOGY CO LTD](https://appshunter.io/developer/1870559776) |

## What reviewers say

### Z2Y Java Principles

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

**Features:** Vision Pro support

**In-app purchases:** none


### 竹林鸟

[App page](https://appshunter.io/ios/app/id6758047946)

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

**In-app purchases:** none


## Frequently asked questions

### Is Z2Y Java Principles free?

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

### Is 竹林鸟 free?

竹林鸟 is free to download, with no in-app purchases.

### Do Z2Y Java Principles or 竹林鸟 have ads?

Neither Z2Y Java Principles nor 竹林鸟 shows ads.

### Which is updated more often, Z2Y Java Principles or 竹林鸟?

Z2Y Java Principles ships an update every 5 days, and 竹林鸟 every 4 weeks. Most recently, Z2Y Java Principles was updated on October 10, 2026 and 竹林鸟 on October 1, 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.*