# 三號電站如約 vs Tracking System

The clearest difference is iOS requirement: 三號電站如約 at 13.0 against Tracking System's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

三號電站如約 ships an update every 3 weeks, Tracking System every 6 weeks. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | 三號電站如約 | Tracking System |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Size | 58 MB | 60 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Sino Express Intelligence Co., Limited](https://appshunter.io/developer/1724540898) | [Synergos Systems Company Limited](https://appshunter.io/developer/1777215731) |

## What reviewers say

### 三號電站如約

[App page](https://appshunter.io/ios/app/id6723865518)

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

**In-app purchases:** none


### Tracking System

[App page](https://appshunter.io/ios/app/tracking-system/id6747028941)

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

**In-app purchases:** none


## Frequently asked questions

### Is 三號電站如約 free?

三號電站如約 is free to download, with no in-app purchases.

### Is Tracking System free?

Tracking System is free to download, with no in-app purchases.

### Do 三號電站如約 or Tracking System have ads?

Neither 三號電站如約 nor Tracking System shows ads.

### Which is updated more often, 三號電站如約 or Tracking System?

三號電站如約 ships an update every 3 weeks, and Tracking System every 6 weeks. Most recently, 三號電站如約 was updated on October 17, 2026 and Tracking System on October 13, 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.*