About
About This Site
Relationship Diagram Generator (soukanzu.jp) is a free web tool built to make visualizing human relationships easy and accessible. It can be used for a wide range of purposes — from mapping out TV drama characters and novel plots to creating org charts and family trees.
Since its launch in 2025, the tool has been used by thousands of users each month. It requires no registration, is completely free, and all data is stored locally in your browser, ensuring complete privacy.
Operator
| Operator | TOMI |
|---|---|
| Site Name | Relationship Diagram Generator |
| URL | https://soukanzu.jp/ |
| Contact | contact@soukanzu.jp |
| X (Twitter) | @TOMI_AI_ |
Tech Stack
This site is built with the following technologies:
- Frontend: HTML5 Canvas, Vanilla JavaScript, CSS3
- Hosting: Vercel
- OG Image Generation: Cloudflare Workers + Satori
- Data Storage: Browser LocalStorage (no server uploads)
Key Features
- Intuitive drag-and-drop interface for building relationship diagrams
- 10-color palette with image upload support
- Bidirectional relationship display with auto-arrange
- High-resolution (3×) image export
- Social sharing to X, LINE, Facebook, and more
- Dynamic OGP image generation for link previews
- Built-in templates (Drama, Family Tree, Team)
- PWA support (works offline)
Contact
For questions, feature requests, or bug reports, please feel free to reach out.