Lu Ban Ruler - Feng Shui
Feng Shui Measuring Tool
Free · Designed for iPad. Not verified for macOS.
Measure doors, altars & furniture with the authentic Luban feng shui ruler. NEW: when a size lands on an unlucky mark, we tell you exactly how many mm to adjust!
LUBAN RULER – The feng shui ruler in your pocket
The Luban ruler is essential when building doors, gates, altars, beds, cabinets or stairs. This app instantly tells you whether a measurement falls on a LUCKY or UNLUCKY segment, and suggests the nearest auspicious size — anytime, anywhere.
ALL THREE RULERS INCLUDED
• Clear Opening (52.2cm) – for the clear opening of doors and gates
• Yang Dwelling (42.9cm) – for stoves, beds, tables and furniture
• Yin Dwelling / Ding Lan (38.8cm) – for altars, shrines and graves
KEY FEATURES
• See the result of all three rulers at once
• Drag the ruler or type a measurement directly (mm/inch)
• Auspicious size suggestions: on an unlucky mark, the app tells you exactly how many mm to add or subtract to reach the nearest lucky one
• Haptic alert when a measurement crosses into an unlucky zone – measure without looking
• Quick-adjust buttons (−1mm / +1mm) and reset-to-zero
• Plain-language meaning for every segment
• Three languages: Vietnamese, English, Chinese
• Light & Dark mode
• Optimized for both iPhone and iPad
WHO IS IT FOR?
• Carpenters, builders and contractors
• Homeowners renovating, building or setting up an altar
• Anyone interested in feng shui
Works fully offline. No account required.
Download now so every dimension in your home is in harmony!
This update makes measuring with the Luban ruler faster and more accurate:
• Auspicious size suggestions: when a measurement lands on an inauspicious segment, the app instantly tells you how many mm to add or subtract to reach the nearest auspicious one.
• Edge-to-edge ruler with a wider, clearer layout and larger result text.
• Haptic alert when a measurement crosses into an inauspicious zone — no need to look at the screen.
• New quick-adjust buttons (−1mm / +1mm) and a reset-to-zero button.
• Easier number entry (comma support and number pad).
• Sharper dark mode and a layout optimized for iPad.
• Reviewed and refined the feng shui terminology across all three languages.
• Brand-new app icon.
• Various bug fixes and stability improvements.
Thank you for using Luban Ruler!
The developer, Manh Nguyen, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Manh Nguyen
- Size
- 1.6 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 2 more
- English, Simplified Chinese, Vietnamese
- Age Rating
00+
- 00+
- Copyright
- © 2026 Manh Nguyen