# RankAI - AI-Powered Product Rankings
# Multi-language | Multi-marketplace | Real-time Analysis

> RankAI is a free AI-powered product ranking service that analyzes products from Rakuten (Japan) and Amazon, filtering fake reviews to find genuinely high-quality products. Available in Japanese, English, Chinese, and Korean.

## What is RankAI?

RankAI uses artificial intelligence to analyze e-commerce product data in real-time, generating trustworthy TOP 10 product rankings. The service covers 75+ product categories and updates every 6 hours.

### Key Capabilities
- **Fake Review Detection**: AI identifies and excludes suspicious review patterns (known as "sakura reviews" in Japan)
- **Multi-Platform Comparison**: Cross-references prices and reviews across Rakuten and Amazon
- **Real-Time Analysis**: Rankings refresh every 6 hours using the latest marketplace data
- **Cost Performance Scoring**: Proprietary algorithm weighing review quality, count, price, and reliability

## Ranking Methodology

Products are scored on a 100-point scale using:
1. Review Reliability (highest weight) - Filters products with suspicious review patterns
2. Review Rating (35%) - Average customer rating, weighted by authenticity
3. Review Count (35%) - Volume of genuine reviews (50+ reviews = high confidence)
4. Cost Performance (30%) - Value relative to price point

## Product Categories

### Electronics & Gadgets
Wireless earbuds, headphones, smartphones, laptops, monitors, keyboards, gaming mice, power banks, chargers, smartwatches, tablets, webcams, SSDs, printers

### Beauty & Personal Care
Hair dryers, hair straighteners, skincare, cosmetics, sunscreen, beauty devices, shampoo, body cream, electric shavers, hair removal devices

### Health & Fitness
Protein supplements, protein bars, supplements, yoga mats, dumbbells, weight scales, electric toothbrushes, green juice (aojiru)

### Kitchen & Home
Coffee makers, coffee beans, electric kettles, rice cookers, frying pans, toasters, microwave ovens, hot plates, water bottles, cutting boards, knives

### Fashion & Accessories
Sneakers, running shoes, backpacks, wallets, sunglasses, bags, smartphone cases

### Home Appliances
Robot vacuums, air purifiers, humidifiers, dehumidifiers, vacuum cleaners, washing machines, dryers, circulators, ceiling lights, futon dryers, irons

### Baby & Kids
Strollers, car seats, baby carriers, diapers, educational toys, baby bottles

### Pets
Dog food, cat food, pet cameras, pet beds, cat litter boxes, dog harnesses

### Sports & Outdoors
Tents, sleeping bags, cooler boxes, hiking boots, golf clubs, protein shakers

### Furniture & Office
Office chairs, gaming chairs, desk lights, PC stands, curtains, mouse pads

## URL Structure

- Homepage: https://rakuten-ranking.vercel.app/
- Keyword Rankings: https://rakuten-ranking.vercel.app/keyword/{keyword}
  - Example: /keyword/ワイヤレスイヤホン (wireless earbuds)
  - Example: /keyword/プロテイン (protein)
  - Example: /keyword/ドライヤー (hair dryer)
- All Rankings: https://rakuten-ranking.vercel.app/ranking
- Buying Guides: https://rakuten-ranking.vercel.app/guide
- Product Comparison: https://rakuten-ranking.vercel.app/compare
- Sitemap: https://rakuten-ranking.vercel.app/sitemap.xml

## Supported Languages
- Japanese (primary)
- English
- Chinese (Simplified)
- Korean

## Data Sources
- Rakuten Ichiba API (Japan's largest e-commerce platform, 50,000+ stores)
- Amazon Product Advertising API (Amazon Japan)

## Legal & Compliance
- GDPR compliant (EU General Data Protection Regulation)
- CCPA compliant (California Consumer Privacy Act)
- Japanese APPI compliant (Act on Protection of Personal Information)
- Cookie consent management with granular controls
- Affiliate disclosure on all pages

## Technical Details
- Built with Next.js 14 (App Router)
- Static Site Generation with Incremental Static Regeneration (6-hour revalidation)
- 118 statically generated pages
- Structured data: ItemList, BreadcrumbList, FAQPage, HowTo, WebSite, Organization schemas
- IndexNow protocol for instant search engine notification

## Contact
- Website: https://rakuten-ranking.vercel.app/
- Contact: https://rakuten-ranking.vercel.app/contact