# STEFANCHO LABS

> STEFANCHO LABS (스테판초 랩스) is a startup in Suwon, South Korea, registered on April 8, 2026. It publishes consumer apps under the Starfathom brand and operates Byeolheim (byeolheim.com), a paid saju report web service that opened on October 11, 2026.

## Company, brand and service

- Company: STEFANCHO LABS (스테판초 랩스), a sole proprietorship registered in the Republic of Korea. Business Registration Number 118-04-31442. Mail-order Business Report No. 2026-수원장안-0592. D-U-N-S 696492918. Representative: Sungjin Cho (조성진). Address: 201-b15, 15 Hwasan-ro 213beon-gil, Jangan-gu, Suwon-si, Gyeonggi-do 16417, Republic of Korea.
- App brand: Starfathom. The name on the company's 15 iOS and Android apps and on starfathom.com. A brand of STEFANCHO LABS, not a separate company. App Store developer name: Sungjin Cho. Google Play developer name: Starfathom.
- Live service: Byeolheim (별헤임), https://byeolheim.com/. A paid web service in Korean, operated by STEFANCHO LABS. Its business details (company name, registration number, address) are shown at the bottom of every page.

## Mission

We make small products that each solve one everyday need well, for people in Korea first. We build them with AI agents, so a very small team can run many products and change them quickly when real usage shows what works.

Goals for the next year:

- Grow Byeolheim into a paid service that pays for itself.
- Improve the apps people use most, guided by how they actually use them.
- Use what we learn to launch more paid products.

## Byeolheim

Byeolheim reads a person's saju, the traditional Korean reading of birth date and time, and turns it into a personal report with a narrator comic. Most readings start with a free preview, and the lifetime report has a 20-page sample. Paid reports cost 990 to 29,900 KRW and open on the web right after payment; the lifetime report runs to about 225 pages and can be downloaded as a PDF. Each report is computed from the customer's birth chart. Parts of the text and the comic dialogue are written by AI models, and the service says so to customers.

## How we build

Claude Code agents write and test most of our code and carry each release through the App Store, Google Play and the web, including Byeolheim.

## Links

- Company website: https://starfathom.com/
- Byeolheim: https://byeolheim.com/
- App Store developer page: https://apps.apple.com/kr/developer/sungjin-cho/id1893002023
- Google Play developer page: https://play.google.com/store/apps/developer?id=Starfathom
- Founder's YouTube (Korean): https://www.youtube.com/@devstefancho

## Contact

- Business: stefan@starfathom.com
- App and service support: support@starfathom.com