# 十三行紫微斗數 for iPhone vs Metal Detector EMF & Stud

The clearest difference is price: Metal Detector EMF & Stud at Free against 十三行紫微斗數 for iPhone's $39.99. 十三行紫微斗數 for iPhone's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement there is nothing between them.

Metal Detector EMF & Stud is free to download; 十三行紫微斗數 for iPhone costs $39.99 up front. Metal Detector EMF & Stud sells 2 in-app purchases, starting at $2.99 per 7 days. 十三行紫微斗數 for iPhone asks for nothing beyond the download.

十三行紫微斗數 for iPhone ships an update every 3 months, Metal Detector EMF & Stud every 4 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 十三行紫微斗數 for iPhone | Metal Detector EMF & Stud |
| --- | --- | --- |
| Price | $39.99 | **Free** |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Paid | — |
| Size | 19 MB | 11 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Firm 13 Limited](https://appshunter.io/developer/294205351) | [MUHAMMET USLU](https://appshunter.io/developer/1864979364) |

## What reviewers say

### 十三行紫微斗數 for iPhone

[App page](https://appshunter.io/ios/app/for-iphone/id899029517)

This professional astrology app generates detailed Zi Wei Dou Shu charts with advanced analysis features. It allows for multi-layer display of planetary movements and astrological influences, offering extensive customization for various astrological schools.

**Highlights:** Multi-layer display of planetary movements and influences, Detailed analysis of Four Transformations (Si Hua), Extensive customization for astrological parameters, Support for various astrological schools and interpretations, Backup and transfer of birth records via iTunes File Sharing, User-friendly interface with Traditional and Simplified Chinese options

**In-app purchases:** none


### Metal Detector EMF & Stud

[App page](https://appshunter.io/ios/app/metal-detector-emf-and-stud/id6778024560)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $2.99 | per 7 days |
| Yearly Pro | $24.99 | per year |


## Frequently asked questions

### Is 十三行紫微斗數 for iPhone free?

十三行紫微斗數 for iPhone costs $39.99, with no in-app purchases.

### Is Metal Detector EMF & Stud free?

Metal Detector EMF & Stud is free to download, with in-app purchases available.

### Do 十三行紫微斗數 for iPhone or Metal Detector EMF & Stud have ads?

Neither 十三行紫微斗數 for iPhone nor Metal Detector EMF & Stud shows ads.

### Which is updated more often, 十三行紫微斗數 for iPhone or Metal Detector EMF & Stud?

十三行紫微斗數 for iPhone ships an update every 3 months, and Metal Detector EMF & Stud every 4 months. Most recently, 十三行紫微斗數 for iPhone was updated on November 1, 2026 and Metal Detector EMF & Stud 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.*