# Online Lu Ban Ruler — Feng Shui Lu Ban Ruler

> Digital Feng Shui Lu Ban ruler for auspicious construction and furniture measurements. (iPhone/iPad app by Cuong Ngo Quang.)

- Source: https://appshunter.io/ios/app/online-lu-ban-ruler/id6499095825 (this page in markdown: same URL + `.md`)
- Developer: [Cuong Ngo Quang](https://appshunter.io/developer/1736908974)
- Category: Lifestyle
- Price: Free with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 18 MB
- Languages: English, Chinese, Chinese, Vietnamese
- Released: 2024-04-22
- Data updated: 2026-06-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/online-lu-ban-ruler/id6499095825/reviews.md

## What is Online Lu Ban Ruler?

1. Why have the Feng Shui Ruler Online Application?

Currently, many types of pre-made Lu Ban rulers are on the market with a maximum length of only 5 meters. The disadvantage is that users cannot determine the size, as well as the good and bad measuring when the length exceeds 5 meters.

Grasping this practical need, our Online Lu Ban Ruler application was born, and is available on multiple platforms, with the maximum length of the Lu Ban ruler up to 16 meters, we hope to help everyone easily pull the Lu Ban ruler anytime, anywhere, whenever, and choose the right golden size as desired.

Based on the lookup measuring, people can use them to determine good and bad measures, to use for houses (doors, windows, height floors...), to use for graves (altars, tombs...), to use for furniture (tables, chairs, wardrobes,...).


2. Learn more about the Lu Ban Rulers.
a. What is a Lu Ban ruler?

A Lu Ban ruler is a type of measuring instrument used to measure dimensions in construction. The name of the Lu Ban ruler is named after the person who invented it - Lu Ban.
This type of Lu Ban ruler is used in the construction of Duong Trach (houses) and Am Trach (graves). On this type of ruler, there are normal size divisions, corresponding to good and bad arcs. Correspondence in the Lu Ban ruler helps people know which sizes to use and which sizes to avoid.

- Graves (Am Trach)

- Houses (Duong Trach)

b. Classification of Lu Ban rulers

Currently, there are many different types of Lu Ban rulers on the market, but in terms of popularity, the 52.2 cm Lu Ban ruler, passed down through generations, and the retractable ruler with dimensions of 42.9 cm at the top and 38.8 cm at the bottom are the most common. Of course, depending on the type of ruler and the item being measured, such as doors, altars, etc., there will be different methods to calculate and determine the "golden measurements.".

3. Main features of the Online Lu Ban ruler application.
- Pull the Lu Ban ruler to select the golden dimensions according to each type of Lu Ban ruler: 52.2 cm, 42.9 cm, 38.8 cm.

- The maximum length that the ruler can be extended is up to 16 meters.

- You can enter specific dimensions in mm to quickly select the desired size.

- View the meaning of the good and bad ranges on each type of Lu Ban ruler.

- Refer to the available golden dimensions, used as the clear height of each floor. Used for windows, and doors. Used for the height, length, and width of the altar. Used for the height and depth of the kitchen...

- Project function: Helps users save the dimensions they choose to use for personal and company projects.

4. Payments - Subscriptions
- The Terms of Use (EULA) are available at: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
- The Privacy Policy is available in the Privacy Policy field in App Store Connect at: https://developer.apple.com/help/app-store-connect/manage-app-information/manage-app-privacy/

5. Disclaimer.
This application was created by individual Ngô Quang Cường and is owned by GiaPhuGroup.com®. This application was designed to help users extend the online Lu Ban ruler up to 15 meters, view the good and bad ranges, and select the desired golden dimensions. All size parameters showing good and bad ranges on this online Lu Ban ruler application are for reference purposes only. The choice of which dimensions to use for any purpose is entirely up to you. We are not responsible for any reason.

- Terms and conditions: https://www.thuoclobanonline.com/en/menu/online-lu-ban-ruler-terms-and-conditions/
- Privacy Policy: https://www.thuoclobanonline.com/en/menu/online-lu-ban-ruler-privacy-policy/

For any inquiries or feedback, please send them to the email address: sales@giaphugroup.com. We will respond to you within 24 working hours.

## Key features

- Digital Lu Ban ruler for Feng Shui measurements
- Extended length up to 16 meters
- Supports 52.2cm, 42.9cm, and 38.8cm ruler types
- View meanings of good and bad ranges
- Enter specific dimensions in mm
- Save project dimensions
- Reference for common golden dimensions

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Removing ads 1 month | $0.39 | per month |
| Loại Bỏ Quảng Cáo 6 Tháng | $1.59 | per 6 months |
| Loại Bỏ Quảng Cáo 12 Tháng | $2.39 | per year |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/online-lu-ban-ruler/id6499095825/reviews.md

### 1/5 — Quá nhìu quảng cáo

*2025-02-21, version 1.3.5*

Ko thể sử dụng nổi do quá nhìu quảng cáo, phải tắt mạng xài off, có mạng lên web online ứng dụng này coi cho rồi nhà phát triển cân đối lại

### 1/5 — Quá bất tiện

*2024-08-21, version 1.3.1*

Quảng cáo dày liên tục dùng rất bất tiện

## Frequently asked questions about Online Lu Ban Ruler

### What is the Online Lu Ban Ruler app used for?

The Online Lu Ban Ruler app is used to measure dimensions for houses, graves, and furniture, helping users select auspicious 'golden' measurements according to Feng Shui principles. It offers a digital alternative to traditional physical rulers.

### What is the maximum length the Online Lu Ban Ruler can measure?

The Online Lu Ban Ruler application supports a maximum length of up to 16 meters, significantly exceeding the limitations of many physical rulers available on the market.

### Can I enter custom dimensions into the Online Lu Ban Ruler?

Yes, you can enter specific dimensions in millimeters (mm) into the Online Lu Ban Ruler app to quickly find desired sizes and their corresponding auspicious or inauspicious meanings.

### What types of Lu Ban rulers does the app support?

The app allows you to pull the Lu Ban ruler to select golden dimensions according to three main types: the 52.2 cm ruler, the 42.9 cm ruler, and the 38.8 cm ruler.

### Does the Online Lu Ban Ruler app have ads?

No, the Online Lu Ban Ruler app is ad-free. However, it offers in-app purchase options to remove ads for a specified duration, with plans ranging from 1 month to 12 months.

### How does the 'Project' function work in the Online Lu Ban Ruler app?

The 'Project' function in the Online Lu Ban Ruler app allows users to save and store the dimensions they have chosen for their personal or company projects. This feature helps in organizing and referencing measurements for ongoing work.

### What is the age rating for the Online Lu Ban Ruler app?

The Online Lu Ban Ruler app has an age rating of 17+, indicating it is intended for mature audiences. This rating is typically assigned based on content that may not be suitable for younger users.

### On which devices can I use the Online Lu Ban Ruler app?

The Online Lu Ban Ruler app is available for iOS devices, including iPhone, iPad, and iPod. It is designed to function across these Apple platforms.

## Version history (last 5 releases)

### 2.1.3 — 2026-06-10

- Refactored the UI of the Lu Ban Ruler (Kéo Thước) interface.
- Updated the interpretations for each segment (cung) across the three types of Lu Ban Rulers.
- Fixed bugs on the Projects page.

### 2.1.2 — 2026-05-23

- Updated the content of the luban rulers tab

### 2.1.1 — 2025-11-28

- Fixed the application interface.
- Added the new language: Chinese.
- Added a new "Project" feature, allowing users to input information about the dimensions of each type of Lu Ban rulers.

### 2.0.1 — 2025-11-26

- Added the new language: Chinese.
- Updated the application interface.
- Added a new "Project" feature, allowing users to input information about the dimensions of each type of Lu Ban rulers.

### 2.0.0 — 2025-11-19

- Updated the application interface.
- Added a new "Project" feature, allowing users to input information about the dimensions of each type of Lu Ban rulers.

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## More apps by Cuong Ngo Quang

- [Currency Converter GiaPhuGroup](https://appshunter.io/ios/app/currency-converter-giaphugroup/id6479899492)
- [Xổ Số Gia Phú](https://appshunter.io/ios/app/xo-so-gia-phu/id6502985591)

All apps by Cuong Ngo Quang: https://appshunter.io/developer/1736908974

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-20.*