Lu Ban Ruler vs Chat API
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lu Ban Ruler
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.
- 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
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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!
Chat API
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.
- 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
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Run private local LLM AI models with Ollama, or unleash AI through OpenAI & Grok APIs for advanced features and flexibility. ChatAPI offers a built-in text-only GPT-4 model for instant AI access, plus support for OpenAI API, Grok API, local LLM Ollama models, and Bing-powered real-time searches. - Flexible AI Access: Use the onboard GPT-4, connect Ollama for running private AI locally on your own PC or server, or integrate OpenAI/Grok/Bing APIs for advanced features like image generation. - Versatile & Powerful: Seamlessly switch between models for drafting, coding, brainstorming, or research with fast, reliable responses. Subscription Options: - Monthly: Unlimited GPT-4, OpenAI/Grok/Bing API integration, and Ollama support. - Yearly: Same as monthly, with cost savings. Download ChatAPI for flexible, private, and powerful AI interactions! Privacy Policy: https://sites.google.com/view/gpt-lite/privacy Terms of Use: https://sites.google.com/view/gpt-lite/terms Support: https://sites.google.com/view/gpt-lite/support
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Lu Ban Ruler | Chat API |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (7 ratings) — better | 4.2 (5 ratings) |
| Positive reviews | — | 75.0% of reviews |
| Number of ratings | 7 — better | 5 |
| Update frequency | Every 6 months | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 2 MB | 78 MB |
| Age rating | 4+ | 17+ |
| Developer | Manh Nguyen | Andres Nunez Soto |
Customer experience
Lu Ban Ruler
Chat API
In-app purchases
Lu Ban Ruler
No in-app purchases
Chat API
- Unlimited Access (Monthly)7 Days trial$1.991 Month
- Unlimited Access (Yearly)$19.991 Year
- Pro Supporter Yearly$49.991 Year
