# Online Lu Ban Ruler vs Document

The clearest difference is iOS requirement: Online Lu Ban Ruler at 13.0 against Document's 16. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Online Lu Ban Ruler sells 3 in-app purchases, starting at $0.39 per month and Document sells 5 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Online Lu Ban Ruler ships an update every 3 weeks, Document every 2 weeks. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Online Lu Ban Ruler | Document |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 9 MB |
| Requires iOS | **13.0** | 16 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Cuong Ngo Quang](https://appshunter.io/developer/1736908974) | [Changsha Danxian Technology Co., Ltd.](https://appshunter.io/developer/1705696767) |

## What reviewers say

### Online Lu Ban Ruler

[App page](https://appshunter.io/ios/app/online-lu-ban-ruler/id6499095825)

This app provides a digital Lu Ban ruler for measuring dimensions in construction, graves, and furniture. It offers extended length options up to 16 meters and allows users to select auspicious measurements based on traditional Feng Shui principles.

**Highlights:** 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

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 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 |


### Document

[App page](https://appshunter.io/ios/app/document-wpsfile-assistant/id6761673952)

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 首周¥1 | $3.99 | per 7 days |
| Weekly Premium Access | $3.99 | per 7 days |
| Weekly Premium - Free Trial | $3.99 | per 7 days |
| Annual Premium - Limited Offer | $12.99 | per year |
| Annual Premium - Best Value | $19.99 | per year |


## Frequently asked questions

### Is Online Lu Ban Ruler free?

Online Lu Ban Ruler is free to download, with in-app purchases available.

### Is Document free?

Document is free to download, with in-app purchases available.

### Do Online Lu Ban Ruler or Document have ads?

Neither Online Lu Ban Ruler nor Document shows ads.

### Which is updated more often, Online Lu Ban Ruler or Document?

Online Lu Ban Ruler ships an update every 3 weeks, and Document every 2 weeks. Most recently, Online Lu Ban Ruler was updated on October 25, 2026 and Document on October 28, 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.*