# Lu Ban Ruler vs Chat API

The clearest difference is in-app purchases: Lu Ban Ruler at none against Chat API's 3. Lu Ban Ruler also leads on ads (none vs shown) and rating (4.4 vs 4.2). Chat API's advantage is update cadence (weekly vs every 6 months). On price, ratings volume, device support and iOS requirement there is nothing between them.

Both are free to download. Chat API sells 3 in-app purchases, starting at $1.99 per month. Lu Ban Ruler asks for nothing beyond the download.

Lu Ban Ruler holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 7 and 5 respectively.

Lu Ban Ruler ships an update every 6 months, Chat API weekly. The most recent releases landed on September 12, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Lu Ban Ruler | Chat API |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (7 ratings)](https://appshunter.io/ios/app/lu-ban-ruler-feng-shui/id6443977526/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/chat-api-ai-wrapper/id6670289029/reviews) |
| Number of ratings | **7** | 5 |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 78 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Manh Nguyen](https://appshunter.io/developer/1445497751) | [Andres Nunez Soto](https://appshunter.io/developer/1748007663) |

## What reviewers say

### Lu Ban Ruler

[App page](https://appshunter.io/ios/app/lu-ban-ruler-feng-shui/id6443977526)

This professional tool applies ancient principles to measure furniture, houses, and graves for auspicious placement. It offers high accuracy and works offline, supporting multiple units for precise application.

**Highlights:** Door Ruler for furniture, Yang House Ruler for buildings, Yin House Ruler for graves, High accuracy, Offline functionality, Multiple unit support (cm, mm, meters), Detailed usage guide

**Features:** macOS Compatibility

**In-app purchases:** none


### Chat API

[App page](https://appshunter.io/ios/app/chat-api-ai-wrapper/id6670289029)

Access powerful AI models locally or through cloud APIs. This tool offers flexible integration with GPT-4, OpenAI, Grok, and local LLMs for diverse tasks like coding, drafting, and research.

**Highlights:** Private local LLM support with Ollama, OpenAI and Grok API integration, Built-in text-only GPT-4 model, Bing-powered real-time searches, Image generation capabilities, Seamless model switching

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access (Monthly) | $1.99 | per month |
| Unlimited Access (Yearly) | $19.99 | per year |
| Pro Supporter Yearly | $49.99 | per year |


## Frequently asked questions

### Is Lu Ban Ruler free?

Lu Ban Ruler is free to download, with no in-app purchases.

### Is Chat API free?

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

### Which has better reviews, Lu Ban Ruler or Chat API?

Lu Ban Ruler is rated higher. Lu Ban Ruler averages 4.4 out of 5 from 7 ratings, while Chat API averages 4.2 from 5 ratings.

### Do Lu Ban Ruler or Chat API have ads?

Chat API shows ads; Lu Ban Ruler does not.

### Which is updated more often, Lu Ban Ruler or Chat API?

Lu Ban Ruler ships an update every 6 months, and Chat API weekly. Most recently, Lu Ban Ruler was updated on September 12, 2026 and Chat API on September 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*