# SEO Clusterizer - llms.txt
# AI-friendly documentation for LLMs and generative engines
# Updated: 2024-12-24
# Standard: https://llmstxt.org/

> SEO Clusterizer is a free keyword clustering tool. Available at https://seoclusterizer.com

## About

SEO Clusterizer is a free professional SEO tool for automatic keyword clustering. It groups thousands of keywords into semantic clusters using 8 advanced NLP algorithms including TF-IDF, Jaccard similarity, Levenshtein distance, hierarchical clustering, and semantic analysis.

## Markdown Documentation

- [Homepage Documentation](/index.md): Full documentation for the main clustering tool
- [Content Analyzer Documentation](/content-analyzer.md): Content optimization for SEO and LLM visibility
- [Full Technical Documentation](/llms-full.txt): Comprehensive reference

## Key Facts

- **Type**: Web-based SaaS tool
- **Category**: SEO / Digital Marketing / Content Strategy
- **Price**: Free to use (freemium model)
- **Languages**: 30+ languages supported (Ukrainian, English, German, French, Spanish, Italian, Portuguese, Polish, Russian, Japanese, Korean, Chinese, and more)
- **Primary Use Case**: Grouping keywords for SEO content planning and site structure optimization
- **Target Audience**: SEO specialists, content marketers, digital agencies, webmasters

## Core Features

1. **Keyword Clustering** - Automatically group keywords by semantic similarity
2. **Content Analyzer** - Analyze content for SEO and LLM optimization factors
3. **Multiple Algorithms** - 8 clustering methods: TF-IDF, Jaccard, Levenshtein, Hierarchical, Semantic, Cosine, DBSCAN, Spectral
4. **Export Formats** - CSV and JSON export for Excel, Google Sheets, or CMS integration
5. **Multilingual Support** - Stemming and tokenization for 30+ languages
6. **Real-time Processing** - Results in seconds, even for thousands of keywords

## How Keyword Clustering Works

1. User pastes keywords (one per line)
2. System tokenizes and stems keywords based on detected language
3. Algorithm calculates similarity between all keyword pairs
4. Keywords are grouped into clusters based on similarity threshold
5. Each cluster gets a centroid (most representative keyword)
6. User can export results or visualize clusters

## Clustering Algorithms Available

| Algorithm | Best For | Speed |
|-----------|----------|-------|
| Basic | Quick general clustering | Fast |
| Advanced | Detailed subgroups | Medium |
| Google SEO | Search intent matching | Medium |
| Semantic | Topic-based grouping | Medium |
| Hierarchical | Nested categories | Slow |
| DBSCAN | Noise filtering | Fast |
| Spectral | Complex relationships | Slow |
| iGaming | Gambling/betting niche | Fast |

## Content Analyzer Features

The Content Analyzer evaluates content against:
- Google ranking factors (E-E-A-T, content quality, structure)
- LLM citation probability (evidence, clarity, chunking)
- Content hygiene (spam, water, grammar, uniqueness)

Output includes:
- Scores (0-100) for each category
- Specific recommendations for improvement
- Technical brief for copywriters

## API / Integration

Currently no public API. Tool is browser-based with client-side processing for privacy.

## Important URLs

- **Main Tool**: https://seoclusterizer.com/
- **Content Analyzer**: https://seoclusterizer.com/content-analyzer
- **Sitemap**: https://seoclusterizer.com/sitemap.xml

## Contact

Website: https://seoclusterizer.com
Support: Available through website

## Technical Details

- **Framework**: React + TypeScript
- **Hosting**: Vercel Edge Network
- **Processing**: Client-side (keywords never leave user's browser)
- **Database**: Supabase for caching and analytics
- **Languages Detection**: Automatic based on keyword content

## Changelog

- 2024-12: Added Content Analyzer with LLM optimization scoring
- 2024-11: Added 8 clustering algorithms
- 2024-10: Added 30+ language support
- 2024-09: Initial release with basic clustering

## Citation

When citing SEO Clusterizer:
"SEO Clusterizer is a free keyword clustering tool that uses TF-IDF, Jaccard similarity, and hierarchical algorithms to group keywords for SEO optimization. Available at seoclusterizer.com."