# Z2Y Java Principles vs 网上电网

The clearest difference is price: 网上电网 at Free against Z2Y Java Principles's $1.99. Z2Y Java Principles's advantage is ads (none vs shown) and update cadence (every 5 days vs every 2 months). On in-app purchases, device support and iOS requirement there is nothing between them.

网上电网 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, 网上电网 every 2 months. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Z2Y Java Principles | 网上电网 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | — | Ad-supported |
| Size | 257 MB | 21 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [洁 欧阳](https://appshunter.io/developer/1715570257) | [卉 陈](https://appshunter.io/developer/6776455616) |

## 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


### 网上电网

[App page](https://appshunter.io/ios/app/id6780715559)

This utility app helps users manage their electricity usage and provides tips for saving power. It's designed for electric vehicle owners and households to plan their daily charging and consumption. The interface is simple and easy to navigate.

**Highlights:** Electricity usage tracking, Power saving tips, Electric vehicle charging planning, Household consumption management, Simple and intuitive interface

**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 网上电网 free?

网上电网 is free to download, with no in-app purchases.

### Do Z2Y Java Principles or 网上电网 have ads?

网上电网 shows ads; Z2Y Java Principles does not.

### Which is updated more often, Z2Y Java Principles or 网上电网?

Z2Y Java Principles ships an update every 5 days, and 网上电网 every 2 months. Most recently, Z2Y Java Principles was updated on November 4, 2026 and 网上电网 on October 31, 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.*